🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 50 (from laksa120)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa050.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical, ml_categories_json AS ml_categories_json, ml_types_json AS ml_types_json, ml_intent_types_json AS ml_intent_types_json, meta_language AS meta_language, attrs_author AS attrs_author, ifNull(toUnixTimestamp(attrs_publish_time), 0) AS attrs_publish_time, ifNull(toUnixTimestamp(attrs_original_publish_time), 0) AS attrs_original_publish_time, ifNull(attrs_is_republished, 0) AS attrs_is_republished, ifNull(attrs_nr_words, 0) AS attrs_nr_words, ifNull(attrs_boilerpipe_nr_words, 0) AS attrs_boilerpipe_nr_words, ifNull(body_ext_links_number, 0) AS body_ext_links_number, ifNull(body_int_links_number, 0) AS body_int_links_number, ifNull(meta_nofollow, 0) AS meta_nofollow, ifNull(meta_noarchive, 0) AS meta_noarchive, ifNull(props_was_rendered, 0) AS props_was_rendered, ifNull(src_redirect, \'\') AS src_redirect, ifNull(download_time_msec, 0) AS download_time_msec, ifNull(download_ttfb_msec, 0) AS download_ttfb_msec, ifNull(download_size, 0) AS download_size FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478","crawl_time":1776314556,"first_indexed_time":1526371637,"http_code":200,"src_unparsed":"com,verywellhealth!www,\/shellfish-allergy-diet-foods-to-avoid-1324478 s443","src_root_hash":"5681562863987870850","history_drop_reason":null,"meta_title":"Foods to Avoid When You Have a Shellfish Allergy","meta_descriptions":["Avoid shrimp, clams, and calamari if you have a shellfish allergy. Learn about other risky foods and how to stay safe when dining out."],"attrs_boilerpipe_text":"If you have a shellfish allergy, avoid all shellfish, including shrimp and clams.\nAlways read food labels carefully, as allergens like mollusks may not be disclosed.\nAvoid seafood restaurants and some cuisines. Cross-contamination can happen easily.\nIf you have a shellfish allergy, the risk of anaphylaxis means you must stay clear of obvious foods like shrimp and lobster but also lesser-known culprits like mollusks and certain sauces. Understanding what to avoid and where shellfish may be hiding can help you keep safe while dining out or cooking at home.\nVerywell \/ Brianna Gilmartin\nWhich Shellfish Are Known to Cause Allergic Reactions?\nShellfish are categorized into two families: mollusks and crustaceans. It's possible to be allergic to just one family. For instance, some people react to crustaceans but not mollusks.\n1\nIf you're allergic to one type of crustacean, such as crab, you're likely allergic to others, like shrimp. However, many individuals who are allergic to one shellfish family are allergic to both.\nAlways consult your healthcare provider before consuming shellfish from either family if you have an allergy.\n2\nCrustaceans\nCrab\nCrawfish (crayfish, crawdads)\nLangoustines\nLobster\nPrawns\nSea urchin\nShrimp\nMollusks\nAbalone\nClams (quahogs)\nCockles\nLimpets\nMussels\nOctopus\nOysters\nScallops\nSnails (escargot; both sea and land snails)\nSquid (calamari)\nSurimi (imitation shellfish, often found in sushi)\nWhelks\nUnfortunately, food packaging may not warn you about all shellfish.\nU.S. food labeling laws\ncover crustaceans but not mollusks. Only foods made with crustaceans must be identified in allergy warning labels, which can be problematic for those with severe mollusk allergies.\nMost food packaging will highlight (or at least list) mollusk ingredients. By carefully reading the package ingredient list, you should be able to identify mollusk-containing foods.\nFor example, a jar of white clam sauce almost certainly will contain clams or clam juice. You'll know to steer clear of it. And fried calamari, also known as fried squid, will include calamari.\nMake sure to read food labels carefully. When in doubt, don't eat the food you're not sure about.\nHow Can You Tell If You Have a Shellfish Allergy?\nCrustaceans cause the most allergic reactions. Symptoms of shellfish allergy can include:\n1\nVomiting\nStomach cramps\nIndigestion\nDiarrhea\nWheezing\nShortness of breath, difficulty breathing\nRepetitive cough\nTightness in throat, hoarse voice\nWeak pulse\nPale or blue coloring of the skin\nHives\nSwelling, can affect the tongue and\/or lips\nDizziness\nConfusion\nHow Do Doctors Diagnose Shellfish Allergies?\nDiagnosing shellfish allergies can be complicated for the following reasons:\n1\nSymptoms can vary from person to person.\nSymptoms may not be the same during every reaction.\nPeople may react even if they don't eat shellfish. They can react if they are close to shellfish being cooked or if their food comes in contact with shellfish.\nIf a shellfish allergy is suspected, your healthcare provider will likely refer you to an\nallergist\n. To make a diagnosis, allergists will usually do the following:\n1\nTake a history of your allergy symptoms\nPerform a skin-prick test, which involves placing a drop of the allergen (allergy-triggering substance) on your skin, and then pricking your skin. If a red, itchy bump appears after 15 to 20 minutes, it confirms an allergy.\nPossibly order a blood test that indicates whether food-specific immunoglobulin E (IgE) antibodies are present in your body\nStrategies for Keeping Shellfish Out of Your Meals\nIf you have a shellfish allergy, exercise caution when dining out. Restaurants and markets often store shellfish together, which can lead to\ncross-contamination\n.\n1\nFor those with severe allergies, avoiding seafood restaurants might be necessary, as allergens from cooking can become airborne.\nDepending on your allergy's severity, you may want to avoid certain cuisines, such as:\nChinese, Japanese, Thai, Vietnamese, or Malaysian foods, which often include a fish sauce made from shrimp or imitation shellfish\nCajun or Creole food, which frequently contains shrimp or other shellfish\nSome restaurants use shellfish stock in sauces or soups. Always inform your server or manager about your allergy and verify if any dishes you're considering contain shellfish.\nRecipes to Avoid\nShellfish is an ingredient in numerous recipes, although it may not always be obvious. Be on the lookout for these dishes and ingredients in restaurants. Also be careful when eating food prepared by friends or relatives:\nBouillabaisse (a French fish soup)\nCeviche (fish or shellfish in an acidic citrus marinade)\nCioppino (fish stew)\nClamato (a clam broth and tomato juice mixture sometimes used in Bloody Mary drinks)\nCrevette (the French term for shrimp)\nScampi (contains lobster or shrimp)\nEtouffée (Cajun crawfish dish)\nGumbo (fish and shellfish stew)\nPaella (Spanish rice dish usually made with shrimp)\nJambalaya (Cajun rice dish often made with shrimp or crawfish)\nNam prik (Thai fish sauce)\nMam tom (Vietnamese fish sauce)\nTips for Dining Out\nBy following certain guidelines and preparation, \neating out can still be a safe\nand enjoyable experience. Take these steps to protect yourself:\nKnow the safest restaurants:\nStrict\nkosher\nrestaurants, as well as vegan and vegetarian restaurants, will not contain shellfish or shellfish products.\nCheck the menu online:\nBefore heading out, review the menu on the restaurant website for shellfish dishes. Many restaurants include information on the most common food allergens, including shellfish. Reviewing the menu can give you a good idea about whether options look safe for you. Keep in mind this won't confirm there are no shellfish ingredients, such as in sauces and stock.\nConsider chain restaurants:\nEach restaurant is likely to use the same ingredients and prepare foods the same way and a growing number of them are allergy-aware. This can be a helpful option especially when you’re traveling and don't know the local restaurants.\nTalk with your server and chef:\nWhen you arrive, make sure your server and the chef are aware of your allergies. Ask what is in your dish and how it’s prepared. If you're not confident the wait staff fully understand your situation, speak to a manager.\nBring a chef card:\nYou can download a \"food allergy alert chef card\" from the Food Allergy Research and Education website.\n3\nThis wallet-sized card lists your food allergies and states that your food must be cooked in a clean and safe area to avoid cross-contamination. Ask the wait staff to show it to the chef(s) on duty.\nAlways bring your rescue medication:\nWhile it's unlikely that you'll need it, always bring your rescue medication with you, such as your epinephrine autoinjector and, if applicable, any \nasthma medication\n. Carrying rescue medication can provide peace of mind so you can relax and enjoy your meal. Consider wearing medical identification, such as a bracelet or necklace that identifies your allergies.\nNon-Food Sources of Shellfish\nWhen you have a severe shellfish allergy, you also need to be aware of potential non-food sources of the allergen. These can include:\nCompost or fertilizers\nFish food\nPet food\nHemCon bandages (a wound dressing made from shrimp shells)\nCalcium supplements\nmade from oyster shells or coral\nGlucosamine\nOmega-3 supplements\n(usually made from fish, but sometimes made from shellfish)\nFrequently Asked Questions\nYes, developing a shellfish allergy as an adult is possible. Around 60% of individuals with this allergy experience their first symptoms in adulthood. This may happen because some people do not try shellfish until they are older.\n4\nA shellfish allergy rarely goes away. Most people keep their allergy. However, 46% of people with a shrimp allergy outgrew it within 10 years.\n5\nThe primary allergen in shellfish is a protein called tropomyosin. Others include parvalbumin and arginine kinase. In all, there are around 20 individual proteins that are potential allergens in shellfish.\n6\nIt depends on the severity of the reaction. Also, some people have a second wave of symptoms after the first one resolves, called a biphasic reaction, so it's advisable that someone who has a severe reaction to seafood be observed in a hospital for at least six hours.\n7\nKeep in mind, too, that symptoms of seafood allergies don't always occur immediately; it could take several hours for them to develop.\n8\n8 Sources\nVerywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our\neditorial process\nto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.\nAmerican College of Allergy, Asthma, and Immunology.\nShellfish\n.\nLopata AL, Kleine-Tebbe J, Kamath SD.\nAllergens and molecular diagnostics of shellfish allergy: Part 22 of the Series Molecular Allergology\n. \nAllergo J Int\n. 2016;25(7):210–218. doi:10.1007\/s40629-016-0124-2\nFood Allergy Research and Education.\nFood allergy chef cards\n.\nFood Allergy Education and Research.\nShellfish allergy\n.\nUCDavis Health.\nWhat you need to know about shellfish allergy diagnosis, treatment\n.\nRuethers T, Taki AC, Johnston EB, et al.\nSeafood allergy: A comprehensive review of fish and shellfish allergens\n. \nMol Immunol\n. 2018;100:28-57. doi:10.1016\/j.molimm.2018.04.008\nFood Allergy Research & Education.\nCommon questions\n.\nAustralasian Society of Clinical Immunology and Allergy.\nAllergic and toxic reactions to seafood\n.\nBy\nJeanette Bradley\nJeanette Bradley is a noted food allergy advocate and author of the cookbook, \"Food Allergy Kitchen Wizardry: 125 Recipes for People with Allergies\"\nWas this page helpful?\nThanks for your feedback!\nWhat is your feedback?","attrs_markdown":"[Skip to content](https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478#skip-to-content)\n\nMenu\n\n- [Health A-Z](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n  - 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Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment.\n\nⒸ 2026 People Inc. — All rights reserved\n\n# Foods to Avoid When You Have a Shellfish Allergy\nBy [Jeanette Bradley](https:\/\/www.verywellhealth.com\/jeanette-bradley-4705338)\n\nUpdated on February 26, 2026\n\nMedically reviewed by  [Daniel More, MD](https:\/\/www.verywellhealth.com\/daniel-more-md-82606)\n\nTable of Contents\n\nView All\n\nTable of Contents\n\n- [Shellfish Types](https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478#toc-which-shellfish-are-known-to-cause-allergic-reactions)\n- [Symptoms](https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478#toc-how-can-you-tell-if-you-have-a-shellfish-allergy)\n- [Diagnosis](https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478#toc-how-do-doctors-diagnose-shellfish-allergies)\n- [Safety Tips](https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478#toc-strategies-for-keeping-shellfish-out-of-your-meals)\n- [Recipes to Avoid](https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478#toc-recipes-to-avoid)\n- [Tips for Dining Out](https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478#toc-tips-for-dining-out)\n- [Non-Food Sources](https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478#toc-non-food-sources-of-shellfish)\n- [FAQ](https:\/\/www.verywellhealth.com\/shellfish-allergy-diet-foods-to-avoid-1324478#toc-faq-6246f83a-4dbc-4ec2-871d-4add33e18c0c)\n\n- If you have a shellfish allergy, avoid all shellfish, including shrimp and clams.\n- Always read food labels carefully, as allergens like mollusks may not be disclosed.\n- Avoid seafood restaurants and some cuisines. Cross-contamination can happen easily.\n\nIf you have a shellfish allergy, the risk of anaphylaxis means you must stay clear of obvious foods like shrimp and lobster but also lesser-known culprits like mollusks and certain sauces. Understanding what to avoid and where shellfish may be hiding can help you keep safe while dining out or cooking at home.\n\n![Foods That Trigger Shellfish Allergies](https:\/\/www.verywellhealth.com\/thmb\/GL1v14nwzLXRODCbvgK8rvogJl4=\/1500x0\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/shellfish-allergy-diet-foods-to-avoid-1324478_V2-eb5d31ca5f1f451eb6f98f75043c4e82.png)\n\n![Foods That Trigger Shellfish Allergies](https:\/\/www.verywellhealth.com\/thmb\/GL1v14nwzLXRODCbvgK8rvogJl4=\/1500x0\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/shellfish-allergy-diet-foods-to-avoid-1324478_V2-eb5d31ca5f1f451eb6f98f75043c4e82.png)\n\nVerywell \/ Brianna Gilmartin\n## Which Shellfish Are Known to Cause Allergic Reactions?\nShellfish are categorized into two families: mollusks and crustaceans. It's possible to be allergic to just one family. For instance, some people react to crustaceans but not mollusks.1\n\nIf you're allergic to one type of crustacean, such as crab, you're likely allergic to others, like shrimp. However, many individuals who are allergic to one shellfish family are allergic to both.  \n  \nAlways consult your healthcare provider before consuming shellfish from either family if you have an allergy.2\n\nCrustaceans\n\n- Crab\n- Crawfish (crayfish, crawdads)\n- Langoustines\n- Lobster\n- Prawns\n- Sea urchin\n- Shrimp\n\nMollusks\n\n- Abalone\n- Clams (quahogs)\n- Cockles\n- Limpets\n- Mussels\n- Octopus\n- Oysters\n- Scallops\n- Snails (escargot; both sea and land snails)\n- Squid (calamari)\n- Surimi (imitation shellfish, often found in sushi)\n- Whelks\n\nUnfortunately, food packaging may not warn you about all shellfish. [U.S. food labeling laws](https:\/\/www.verywellhealth.com\/can-you-have-malt-if-you-re-gluten-sensitive-4139861) cover crustaceans but not mollusks. Only foods made with crustaceans must be identified in allergy warning labels, which can be problematic for those with severe mollusk allergies.\n\nMost food packaging will highlight (or at least list) mollusk ingredients. By carefully reading the package ingredient list, you should be able to identify mollusk-containing foods.\n\nFor example, a jar of white clam sauce almost certainly will contain clams or clam juice. You'll know to steer clear of it. And fried calamari, also known as fried squid, will include calamari.\n\nMake sure to read food labels carefully. When in doubt, don't eat the food you're not sure about.\n\n## How Can You Tell If You Have a Shellfish Allergy?\nCrustaceans cause the most allergic reactions. Symptoms of shellfish allergy can include:1\n\n- Vomiting\n- Stomach cramps\n- Indigestion\n- Diarrhea\n- Wheezing\n- Shortness of breath, difficulty breathing\n- Repetitive cough\n- Tightness in throat, hoarse voice\n- Weak pulse\n- Pale or blue coloring of the skin\n- Hives\n- Swelling, can affect the tongue and\/or lips\n- Dizziness\n- Confusion\n## How Do Doctors Diagnose Shellfish Allergies?\nDiagnosing shellfish allergies can be complicated for the following reasons:1\n\n- Symptoms can vary from person to person.\n- Symptoms may not be the same during every reaction.\n- People may react even if they don't eat shellfish. They can react if they are close to shellfish being cooked or if their food comes in contact with shellfish.\n\nIf a shellfish allergy is suspected, your healthcare provider will likely refer you to an [allergist](https:\/\/www.verywellhealth.com\/how-to-interpret-the-rast-test-results-1324055). To make a diagnosis, allergists will usually do the following:1\n\n- Take a history of your allergy symptoms\n- Perform a skin-prick test, which involves placing a drop of the allergen (allergy-triggering substance) on your skin, and then pricking your skin. If a red, itchy bump appears after 15 to 20 minutes, it confirms an allergy.\n- Possibly order a blood test that indicates whether food-specific immunoglobulin E (IgE) antibodies are present in your body\n## Strategies for Keeping Shellfish Out of Your Meals\nIf you have a shellfish allergy, exercise caution when dining out. Restaurants and markets often store shellfish together, which can lead to [cross-contamination](https:\/\/www.verywellhealth.com\/food-making-you-sick-allergy-elimination-diet-may-help-1324053).1 For those with severe allergies, avoiding seafood restaurants might be necessary, as allergens from cooking can become airborne.\n\nDepending on your allergy's severity, you may want to avoid certain cuisines, such as:\n\n- Chinese, Japanese, Thai, Vietnamese, or Malaysian foods, which often include a fish sauce made from shrimp or imitation shellfish\n- Cajun or Creole food, which frequently contains shrimp or other shellfish\n\nSome restaurants use shellfish stock in sauces or soups. Always inform your server or manager about your allergy and verify if any dishes you're considering contain shellfish.\n\n## Recipes to Avoid\nShellfish is an ingredient in numerous recipes, although it may not always be obvious. Be on the lookout for these dishes and ingredients in restaurants. Also be careful when eating food prepared by friends or relatives:\n\n- Bouillabaisse (a French fish soup)\n- Ceviche (fish or shellfish in an acidic citrus marinade)\n- Cioppino (fish stew)\n- Clamato (a clam broth and tomato juice mixture sometimes used in Bloody Mary drinks)\n- Crevette (the French term for shrimp)\n- Scampi (contains lobster or shrimp)\n- Etouffée (Cajun crawfish dish)\n- Gumbo (fish and shellfish stew)\n- Paella (Spanish rice dish usually made with shrimp)\n- Jambalaya (Cajun rice dish often made with shrimp or crawfish)\n- Nam prik (Thai fish sauce)\n- Mam tom (Vietnamese fish sauce)\n## Tips for Dining Out\nBy following certain guidelines and preparation, [eating out can still be a safe](https:\/\/www.verywellhealth.com\/can-you-have-malt-if-you-re-gluten-sensitive-4139861) and enjoyable experience. Take these steps to protect yourself:\n\n- **Know the safest restaurants:** Strict [kosher](https:\/\/www.verywellhealth.com\/the-most-common-food-allergies-1324134) restaurants, as well as vegan and vegetarian restaurants, will not contain shellfish or shellfish products.\n- **Check the menu online:** Before heading out, review the menu on the restaurant website for shellfish dishes. Many restaurants include information on the most common food allergens, including shellfish. Reviewing the menu can give you a good idea about whether options look safe for you. Keep in mind this won't confirm there are no shellfish ingredients, such as in sauces and stock.\n- **Consider chain restaurants:** Each restaurant is likely to use the same ingredients and prepare foods the same way and a growing number of them are allergy-aware. This can be a helpful option especially when you’re traveling and don't know the local restaurants.\n- **Talk with your server and chef:** When you arrive, make sure your server and the chef are aware of your allergies. Ask what is in your dish and how it’s prepared. If you're not confident the wait staff fully understand your situation, speak to a manager.\n- **Bring a chef card:** You can download a \"food allergy alert chef card\" from the Food Allergy Research and Education website.3 This wallet-sized card lists your food allergies and states that your food must be cooked in a clean and safe area to avoid cross-contamination. Ask the wait staff to show it to the chef(s) on duty.\n- **Always bring your rescue medication:** While it's unlikely that you'll need it, always bring your rescue medication with you, such as your epinephrine autoinjector and, if applicable, any [asthma medication](https:\/\/www.verywellhealth.com\/asthma-treatment-4014205). Carrying rescue medication can provide peace of mind so you can relax and enjoy your meal. Consider wearing medical identification, such as a bracelet or necklace that identifies your allergies.\n## Non-Food Sources of Shellfish\nWhen you have a severe shellfish allergy, you also need to be aware of potential non-food sources of the allergen. These can include:\n\n- Compost or fertilizers\n- Fish food\n- Pet food\n- HemCon bandages (a wound dressing made from shrimp shells)\n- [Calcium supplements](https:\/\/www.verywellhealth.com\/herbs-for-osteoporosis-5206635) made from oyster shells or coral\n- Glucosamine\n- [Omega-3 supplements](https:\/\/www.verywellhealth.com\/fish-allergy-and-omega-3-supplements-1324477) (usually made from fish, but sometimes made from shellfish)\n\n### Frequently Asked Questions\n- Can you develop a shellfish allergy as an adult?\n  Yes, developing a shellfish allergy as an adult is possible. Around 60% of individuals with this allergy experience their first symptoms in adulthood. This may happen because some people do not try shellfish until they are older.4\n- Can a shellfish allergy go away?\n  A shellfish allergy rarely goes away. Most people keep their allergy. However, 46% of people with a shrimp allergy outgrew it within 10 years.5\n- What component of shellfish causes an allergic reaction?\n  The primary allergen in shellfish is a protein called tropomyosin. Others include parvalbumin and arginine kinase. In all, there are around 20 individual proteins that are potential allergens in shellfish.6\n  \n  Learn More: [What Causes Food Allergies?](https:\/\/www.verywellhealth.com\/food-allergies-causes-and-risk-factors-4685818)\n- How long do shellfish allergy symptoms last?\n  It depends on the severity of the reaction. Also, some people have a second wave of symptoms after the first one resolves, called a biphasic reaction, so it's advisable that someone who has a severe reaction to seafood be observed in a hospital for at least six hours.7 Keep in mind, too, that symptoms of seafood allergies don't always occur immediately; it could take several hours for them to develop.8\n  \n  Learn More: [How Anaphylaxis Is Treated](https:\/\/www.verywellhealth.com\/anaphylaxis-7375994)\n\nRead more:\n\n- [Health A-Z](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n- [Allergies](https:\/\/www.verywellhealth.com\/allergies-overview-4581761)\n- [Food Allergies](https:\/\/www.verywellhealth.com\/food-allergy-overview-4581969)\n- [Living With](https:\/\/www.verywellhealth.com\/food-allergy-living-with-4013293)\n\n8 Sources\n\nVerywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our [editorial process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042) to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.\n\n1. American College of Allergy, Asthma, and Immunology. [Shellfish](https:\/\/acaai.org\/allergies\/allergic-conditions\/food\/shellfish\/).\n2. Lopata AL, Kleine-Tebbe J, Kamath SD. [Allergens and molecular diagnostics of shellfish allergy: Part 22 of the Series Molecular Allergology](https:\/\/doi.org\/10.1007\/s40629-016-0124-2). *Allergo J Int*. 2016;25(7):210–218. doi:10.1007\/s40629-016-0124-2\n3. Food Allergy Research and Education. [Food allergy chef cards](https:\/\/www.foodallergy.org\/resources\/food-allergy-chef-cards).\n4. Food Allergy Education and Research. [Shellfish allergy](https:\/\/www.foodallergy.org\/living-food-allergies\/food-allergy-essentials\/common-allergens\/shellfish).\n5. UCDavis Health. [What you need to know about shellfish allergy diagnosis, treatment](https:\/\/health.ucdavis.edu\/news\/headlines\/what-you-need-to-know-about-shellfish-allergy-diagnosis-treatment\/2022\/10).\n6. Ruethers T, Taki AC, Johnston EB, et al. [Seafood allergy: A comprehensive review of fish and shellfish allergens](https:\/\/dx.doi.org\/10.1016\/j.molimm.2018.04.008). *Mol Immunol*. 2018;100:28-57. doi:10.1016\/j.molimm.2018.04.008\n7. Food Allergy Research & Education. [Common questions](https:\/\/www.foodallergy.org\/resources\/common-questions).\n8. Australasian Society of Clinical Immunology and Allergy. [Allergic and toxic reactions to seafood](https:\/\/www.allergy.org.au\/images\/pcc\/ASCIA_PCC_Allergic_Reactions_seafood_2014.pdf).\n\n![Jeanette Bradley](https:\/\/www.verywellhealth.com\/thmb\/4lYN3LgyZ4iOlxYLnon69_KWD5w=\/144x144\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/Jeanette-Bradley-1000-d3d86f62b25141a793edfc8b57fe11a3.jpg)\n\n![Jeanette Bradley](https:\/\/www.verywellhealth.com\/thmb\/4lYN3LgyZ4iOlxYLnon69_KWD5w=\/144x144\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/Jeanette-Bradley-1000-d3d86f62b25141a793edfc8b57fe11a3.jpg)\n\nBy [Jeanette Bradley](https:\/\/www.verywellhealth.com\/jeanette-bradley-4705338)   \n Jeanette Bradley is a noted food allergy advocate and author of the cookbook, \"Food Allergy Kitchen Wizardry: 125 Recipes for People with Allergies\"\n\n[See Our Editorial Process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042)\n\n[Meet Our Medical Expert Board](https:\/\/www.verywellhealth.com\/meet-our-medical-expert-board-11762003)\n\nShare Feedback\n\nWas this page helpful?\n\nThanks for your feedback\\!\n\nWhat is your feedback?\n\nHelpful\n\nReport an Error\n\nOther\n\nRelated Articles\n\n[![A hand holding almonds with the other hand holding the container of almonds](https:\/\/www.verywellhealth.com\/thmb\/_dPFcwl84XheFPuMhvTMDz0sDQE=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/VWH-GettyImages-1317518776-d2e7ac2e77354404803bebd28e061357.jpg) ![A hand holding almonds with the other hand holding the container of almonds](https:\/\/www.verywellhealth.com\/thmb\/_dPFcwl84XheFPuMhvTMDz0sDQE=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/VWH-GettyImages-1317518776-d2e7ac2e77354404803bebd28e061357.jpg) Is Almond Extract Safe if You Have Nut Allergies?](https:\/\/www.verywellhealth.com\/is-almond-extract-safe-for-a-tree-nut-allergy-1324375)\n\n[![Raw steak, pork chops, and chicken](https:\/\/www.verywellhealth.com\/thmb\/Gn0Q2qIuS6Wuu4fgHSloBaMSxpw=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/meat-allergy-82891-primary-recirc-c3079f01cf3c469493129a3580ebacf7.jpg) ![Raw steak, pork chops, and chicken](https:\/\/www.verywellhealth.com\/thmb\/Gn0Q2qIuS6Wuu4fgHSloBaMSxpw=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/meat-allergy-82891-primary-recirc-c3079f01cf3c469493129a3580ebacf7.jpg) Understanding the Symptoms of a Meat Allergy](https:\/\/www.verywellhealth.com\/meat-allergy-82891)\n\n[![Bowl of emmer wheat](https:\/\/www.verywellhealth.com\/thmb\/NcK48va7O41Dj9__FMECl5iWpSE=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/the-wheat-allergy-diet-guide-1324279-primary-recirc-70ef0114e17e4f7b9a1faeab8b516e1e.jpg) ![Bowl of emmer wheat](https:\/\/www.verywellhealth.com\/thmb\/NcK48va7O41Dj9__FMECl5iWpSE=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/the-wheat-allergy-diet-guide-1324279-primary-recirc-70ef0114e17e4f7b9a1faeab8b516e1e.jpg) What Is a Wheat Allergy?](https:\/\/www.verywellhealth.com\/the-wheat-allergy-diet-guide-1324279)\n\n[![Woman Cutting Raw Chicken on a Wooden Cutting Board](https:\/\/www.verywellhealth.com\/thmb\/UjlvDgbC02NQUsKAzUCJRqH4oYo=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-182179635-6ed960b19ca94d3da67599f3ba7552e5.jpg) ![Woman Cutting Raw Chicken on a Wooden Cutting Board](https:\/\/www.verywellhealth.com\/thmb\/UjlvDgbC02NQUsKAzUCJRqH4oYo=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-182179635-6ed960b19ca94d3da67599f3ba7552e5.jpg) Can You Be Allergic to Chicken?](https:\/\/www.verywellhealth.com\/chicken-allergy-5222949)\n\n[![Bowl of various tomatoes](https:\/\/www.verywellhealth.com\/thmb\/S2HsqSGzwE-JeOhfVqDy3RpL96Y=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/tomato-allergy-82855-primary-recirc-e5f2dfffdd6241d2bc03b59df1c81853.jpg) ![Bowl of various tomatoes](https:\/\/www.verywellhealth.com\/thmb\/S2HsqSGzwE-JeOhfVqDy3RpL96Y=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/tomato-allergy-82855-primary-recirc-e5f2dfffdd6241d2bc03b59df1c81853.jpg) Tomato Allergies: Symptoms, Foods to Avoid, and How to Manage](https:\/\/www.verywellhealth.com\/tomato-allergy-82855)\n\n[![Kiwi](https:\/\/www.verywellhealth.com\/thmb\/LMQMXoqMxR1EAZJw_Ey64pH0DiI=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/kiwi-crop-e4b29ee66a3e4d0385ac836a886f6ee6.jpg) ![Kiwi](https:\/\/www.verywellhealth.com\/thmb\/LMQMXoqMxR1EAZJw_Ey64pH0DiI=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/kiwi-crop-e4b29ee66a3e4d0385ac836a886f6ee6.jpg) Are You Allergic to Kiwi? 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Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment.\n\nⒸ 2026 People Inc. — All rights reserved\n\nVerywell Health is part of the [People Inc.](https:\/\/www.people.inc\/) publishing family.\n\n![]()","attrs_readable_markdown":"- If you have a shellfish allergy, avoid all shellfish, including shrimp and clams.\n- Always read food labels carefully, as allergens like mollusks may not be disclosed.\n- Avoid seafood restaurants and some cuisines. Cross-contamination can happen easily.\n\nIf you have a shellfish allergy, the risk of anaphylaxis means you must stay clear of obvious foods like shrimp and lobster but also lesser-known culprits like mollusks and certain sauces. Understanding what to avoid and where shellfish may be hiding can help you keep safe while dining out or cooking at home.\n\nVerywell \/ Brianna Gilmartin\n\n## Which Shellfish Are Known to Cause Allergic Reactions?\nShellfish are categorized into two families: mollusks and crustaceans. It's possible to be allergic to just one family. For instance, some people react to crustaceans but not mollusks.1\n\nIf you're allergic to one type of crustacean, such as crab, you're likely allergic to others, like shrimp. However, many individuals who are allergic to one shellfish family are allergic to both.\n\nAlways consult your healthcare provider before consuming shellfish from either family if you have an allergy.2\n\nCrustaceans\n\n- Crab\n- Crawfish (crayfish, crawdads)\n- Langoustines\n- Lobster\n- Prawns\n- Sea urchin\n- Shrimp\n\nMollusks\n\n- Abalone\n- Clams (quahogs)\n- Cockles\n- Limpets\n- Mussels\n- Octopus\n- Oysters\n- Scallops\n- Snails (escargot; both sea and land snails)\n- Squid (calamari)\n- Surimi (imitation shellfish, often found in sushi)\n- Whelks\n\nUnfortunately, food packaging may not warn you about all shellfish. [U.S. food labeling laws](https:\/\/www.verywellhealth.com\/can-you-have-malt-if-you-re-gluten-sensitive-4139861) cover crustaceans but not mollusks. Only foods made with crustaceans must be identified in allergy warning labels, which can be problematic for those with severe mollusk allergies.\n\nMost food packaging will highlight (or at least list) mollusk ingredients. By carefully reading the package ingredient list, you should be able to identify mollusk-containing foods.\n\nFor example, a jar of white clam sauce almost certainly will contain clams or clam juice. You'll know to steer clear of it. And fried calamari, also known as fried squid, will include calamari.\n\nMake sure to read food labels carefully. When in doubt, don't eat the food you're not sure about.\n\n## How Can You Tell If You Have a Shellfish Allergy?\nCrustaceans cause the most allergic reactions. Symptoms of shellfish allergy can include:1\n\n- Vomiting\n- Stomach cramps\n- Indigestion\n- Diarrhea\n- Wheezing\n- Shortness of breath, difficulty breathing\n- Repetitive cough\n- Tightness in throat, hoarse voice\n- Weak pulse\n- Pale or blue coloring of the skin\n- Hives\n- Swelling, can affect the tongue and\/or lips\n- Dizziness\n- Confusion\n## How Do Doctors Diagnose Shellfish Allergies?\nDiagnosing shellfish allergies can be complicated for the following reasons:1\n\n- Symptoms can vary from person to person.\n- Symptoms may not be the same during every reaction.\n- People may react even if they don't eat shellfish. They can react if they are close to shellfish being cooked or if their food comes in contact with shellfish.\n\nIf a shellfish allergy is suspected, your healthcare provider will likely refer you to an [allergist](https:\/\/www.verywellhealth.com\/how-to-interpret-the-rast-test-results-1324055). To make a diagnosis, allergists will usually do the following:1\n\n- Take a history of your allergy symptoms\n- Perform a skin-prick test, which involves placing a drop of the allergen (allergy-triggering substance) on your skin, and then pricking your skin. If a red, itchy bump appears after 15 to 20 minutes, it confirms an allergy.\n- Possibly order a blood test that indicates whether food-specific immunoglobulin E (IgE) antibodies are present in your body\n## Strategies for Keeping Shellfish Out of Your Meals\nIf you have a shellfish allergy, exercise caution when dining out. Restaurants and markets often store shellfish together, which can lead to [cross-contamination](https:\/\/www.verywellhealth.com\/food-making-you-sick-allergy-elimination-diet-may-help-1324053).1 For those with severe allergies, avoiding seafood restaurants might be necessary, as allergens from cooking can become airborne.\n\nDepending on your allergy's severity, you may want to avoid certain cuisines, such as:\n\n- Chinese, Japanese, Thai, Vietnamese, or Malaysian foods, which often include a fish sauce made from shrimp or imitation shellfish\n- Cajun or Creole food, which frequently contains shrimp or other shellfish\n\nSome restaurants use shellfish stock in sauces or soups. Always inform your server or manager about your allergy and verify if any dishes you're considering contain shellfish.\n\n## Recipes to Avoid\nShellfish is an ingredient in numerous recipes, although it may not always be obvious. Be on the lookout for these dishes and ingredients in restaurants. Also be careful when eating food prepared by friends or relatives:\n\n- Bouillabaisse (a French fish soup)\n- Ceviche (fish or shellfish in an acidic citrus marinade)\n- Cioppino (fish stew)\n- Clamato (a clam broth and tomato juice mixture sometimes used in Bloody Mary drinks)\n- Crevette (the French term for shrimp)\n- Scampi (contains lobster or shrimp)\n- Etouffée (Cajun crawfish dish)\n- Gumbo (fish and shellfish stew)\n- Paella (Spanish rice dish usually made with shrimp)\n- Jambalaya (Cajun rice dish often made with shrimp or crawfish)\n- Nam prik (Thai fish sauce)\n- Mam tom (Vietnamese fish sauce)\n## Tips for Dining Out\nBy following certain guidelines and preparation, [eating out can still be a safe](https:\/\/www.verywellhealth.com\/can-you-have-malt-if-you-re-gluten-sensitive-4139861) and enjoyable experience. Take these steps to protect yourself:\n\n- **Know the safest restaurants:** Strict [kosher](https:\/\/www.verywellhealth.com\/the-most-common-food-allergies-1324134) restaurants, as well as vegan and vegetarian restaurants, will not contain shellfish or shellfish products.\n- **Check the menu online:** Before heading out, review the menu on the restaurant website for shellfish dishes. Many restaurants include information on the most common food allergens, including shellfish. Reviewing the menu can give you a good idea about whether options look safe for you. Keep in mind this won't confirm there are no shellfish ingredients, such as in sauces and stock.\n- **Consider chain restaurants:** Each restaurant is likely to use the same ingredients and prepare foods the same way and a growing number of them are allergy-aware. This can be a helpful option especially when you’re traveling and don't know the local restaurants.\n- **Talk with your server and chef:** When you arrive, make sure your server and the chef are aware of your allergies. Ask what is in your dish and how it’s prepared. If you're not confident the wait staff fully understand your situation, speak to a manager.\n- **Bring a chef card:** You can download a \"food allergy alert chef card\" from the Food Allergy Research and Education website.3 This wallet-sized card lists your food allergies and states that your food must be cooked in a clean and safe area to avoid cross-contamination. Ask the wait staff to show it to the chef(s) on duty.\n- **Always bring your rescue medication:** While it's unlikely that you'll need it, always bring your rescue medication with you, such as your epinephrine autoinjector and, if applicable, any [asthma medication](https:\/\/www.verywellhealth.com\/asthma-treatment-4014205). Carrying rescue medication can provide peace of mind so you can relax and enjoy your meal. Consider wearing medical identification, such as a bracelet or necklace that identifies your allergies.\n## Non-Food Sources of Shellfish\nWhen you have a severe shellfish allergy, you also need to be aware of potential non-food sources of the allergen. These can include:\n\n- Compost or fertilizers\n- Fish food\n- Pet food\n- HemCon bandages (a wound dressing made from shrimp shells)\n- [Calcium supplements](https:\/\/www.verywellhealth.com\/herbs-for-osteoporosis-5206635) made from oyster shells or coral\n- Glucosamine\n- [Omega-3 supplements](https:\/\/www.verywellhealth.com\/fish-allergy-and-omega-3-supplements-1324477) (usually made from fish, but sometimes made from shellfish)\n\n### Frequently Asked Questions\n- Yes, developing a shellfish allergy as an adult is possible. Around 60% of individuals with this allergy experience their first symptoms in adulthood. This may happen because some people do not try shellfish until they are older.4\n- A shellfish allergy rarely goes away. Most people keep their allergy. However, 46% of people with a shrimp allergy outgrew it within 10 years.5\n- The primary allergen in shellfish is a protein called tropomyosin. Others include parvalbumin and arginine kinase. In all, there are around 20 individual proteins that are potential allergens in shellfish.6\n- It depends on the severity of the reaction. Also, some people have a second wave of symptoms after the first one resolves, called a biphasic reaction, so it's advisable that someone who has a severe reaction to seafood be observed in a hospital for at least six hours.7 Keep in mind, too, that symptoms of seafood allergies don't always occur immediately; it could take several hours for them to develop.8\n\n8 Sources\n\nVerywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our [editorial process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042) to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.\n\n1. American College of Allergy, Asthma, and Immunology. [Shellfish](https:\/\/acaai.org\/allergies\/allergic-conditions\/food\/shellfish\/).\n2. Lopata AL, Kleine-Tebbe J, Kamath SD. [Allergens and molecular diagnostics of shellfish allergy: Part 22 of the Series Molecular Allergology](https:\/\/doi.org\/10.1007\/s40629-016-0124-2). *Allergo J Int*. 2016;25(7):210–218. doi:10.1007\/s40629-016-0124-2\n3. Food Allergy Research and Education. [Food allergy chef cards](https:\/\/www.foodallergy.org\/resources\/food-allergy-chef-cards).\n4. Food Allergy Education and Research. [Shellfish allergy](https:\/\/www.foodallergy.org\/living-food-allergies\/food-allergy-essentials\/common-allergens\/shellfish).\n5. UCDavis Health. [What you need to know about shellfish allergy diagnosis, treatment](https:\/\/health.ucdavis.edu\/news\/headlines\/what-you-need-to-know-about-shellfish-allergy-diagnosis-treatment\/2022\/10).\n6. Ruethers T, Taki AC, Johnston EB, et al. [Seafood allergy: A comprehensive review of fish and shellfish allergens](https:\/\/dx.doi.org\/10.1016\/j.molimm.2018.04.008). *Mol Immunol*. 2018;100:28-57. doi:10.1016\/j.molimm.2018.04.008\n7. Food Allergy Research & Education. [Common questions](https:\/\/www.foodallergy.org\/resources\/common-questions).\n8. Australasian Society of Clinical Immunology and Allergy. [Allergic and toxic reactions to seafood](https:\/\/www.allergy.org.au\/images\/pcc\/ASCIA_PCC_Allergic_Reactions_seafood_2014.pdf).\n\n![Jeanette Bradley](https:\/\/www.verywellhealth.com\/thmb\/4lYN3LgyZ4iOlxYLnon69_KWD5w=\/144x144\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/Jeanette-Bradley-1000-d3d86f62b25141a793edfc8b57fe11a3.jpg)\n\nBy [Jeanette Bradley](https:\/\/www.verywellhealth.com\/jeanette-bradley-4705338)   \n Jeanette Bradley is a noted food allergy advocate and author of the cookbook, \"Food Allergy Kitchen Wizardry: 125 Recipes for People with Allergies\"\n\nWas this page helpful?\n\nThanks for your feedback\\!\n\nWhat is your feedback?","meta_canonical":null,"ml_categories_json":"{\"\/Health\":955,\"\/Health\/Nutrition\":671,\"\/Food_and_Drink\":562,\"\/Health\/Nutrition\/Special_and_Restricted_Diets\":541,\"\/Food_and_Drink\/Food\":448,\"\/Food_and_Drink\/Food\/Grains_and_Pasta\":193}","ml_types_json":"{\"\/Article\":997,\"\/Article\/How_to\":737}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1526371637,"attrs_is_republished":0,"attrs_nr_words":"2107","attrs_boilerpipe_nr_words":"1524","body_ext_links_number":24,"body_int_links_number":68,"meta_nofollow":0,"meta_noarchive":1,"props_was_rendered":1,"src_redirect":"","download_time_msec":850,"download_ttfb_msec":687,"download_size":55657}

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If you have a shellfish allergy, avoid all shellfish, including shrimp and clams. Always read food labels carefully, as allergens like mollusks may not be disclosed. Avoid seafood restaurants and some cuisines. Cross-contamination can happen easily. If you have a shellfish allergy, the risk of anaphylaxis means you must stay clear of obvious foods like shrimp and lobster but also lesser-known culprits like mollusks and certain sauces. Understanding what to avoid and where shellfish may be hiding can help you keep safe while dining out or cooking at home. Verywell / Brianna Gilmartin Which Shellfish Are Known to Cause Allergic Reactions? Shellfish are categorized into two families: mollusks and crustaceans. It's possible to be allergic to just one family. For instance, some people react to crustaceans but not mollusks. 1 If you're allergic to one type of crustacean, such as crab, you're likely allergic to others, like shrimp. However, many individuals who are allergic to one shellfish family are allergic to both. Always consult your healthcare provider before consuming shellfish from either family if you have an allergy. 2 Crustaceans Crab Crawfish (crayfish, crawdads) Langoustines Lobster Prawns Sea urchin Shrimp Mollusks Abalone Clams (quahogs) Cockles Limpets Mussels Octopus Oysters Scallops Snails (escargot; both sea and land snails) Squid (calamari) Surimi (imitation shellfish, often found in sushi) Whelks Unfortunately, food packaging may not warn you about all shellfish. U.S. food labeling laws cover crustaceans but not mollusks. Only foods made with crustaceans must be identified in allergy warning labels, which can be problematic for those with severe mollusk allergies. Most food packaging will highlight (or at least list) mollusk ingredients. By carefully reading the package ingredient list, you should be able to identify mollusk-containing foods. For example, a jar of white clam sauce almost certainly will contain clams or clam juice. You'll know to steer clear of it. And fried calamari, also known as fried squid, will include calamari. Make sure to read food labels carefully. When in doubt, don't eat the food you're not sure about. How Can You Tell If You Have a Shellfish Allergy? Crustaceans cause the most allergic reactions. Symptoms of shellfish allergy can include: 1 Vomiting Stomach cramps Indigestion Diarrhea Wheezing Shortness of breath, difficulty breathing Repetitive cough Tightness in throat, hoarse voice Weak pulse Pale or blue coloring of the skin Hives Swelling, can affect the tongue and/or lips Dizziness Confusion How Do Doctors Diagnose Shellfish Allergies? Diagnosing shellfish allergies can be complicated for the following reasons: 1 Symptoms can vary from person to person. Symptoms may not be the same during every reaction. People may react even if they don't eat shellfish. They can react if they are close to shellfish being cooked or if their food comes in contact with shellfish. If a shellfish allergy is suspected, your healthcare provider will likely refer you to an allergist . To make a diagnosis, allergists will usually do the following: 1 Take a history of your allergy symptoms Perform a skin-prick test, which involves placing a drop of the allergen (allergy-triggering substance) on your skin, and then pricking your skin. If a red, itchy bump appears after 15 to 20 minutes, it confirms an allergy. Possibly order a blood test that indicates whether food-specific immunoglobulin E (IgE) antibodies are present in your body Strategies for Keeping Shellfish Out of Your Meals If you have a shellfish allergy, exercise caution when dining out. Restaurants and markets often store shellfish together, which can lead to cross-contamination . 1 For those with severe allergies, avoiding seafood restaurants might be necessary, as allergens from cooking can become airborne. Depending on your allergy's severity, you may want to avoid certain cuisines, such as: Chinese, Japanese, Thai, Vietnamese, or Malaysian foods, which often include a fish sauce made from shrimp or imitation shellfish Cajun or Creole food, which frequently contains shrimp or other shellfish Some restaurants use shellfish stock in sauces or soups. Always inform your server or manager about your allergy and verify if any dishes you're considering contain shellfish. Recipes to Avoid Shellfish is an ingredient in numerous recipes, although it may not always be obvious. Be on the lookout for these dishes and ingredients in restaurants. Also be careful when eating food prepared by friends or relatives: Bouillabaisse (a French fish soup) Ceviche (fish or shellfish in an acidic citrus marinade) Cioppino (fish stew) Clamato (a clam broth and tomato juice mixture sometimes used in Bloody Mary drinks) Crevette (the French term for shrimp) Scampi (contains lobster or shrimp) Etouffée (Cajun crawfish dish) Gumbo (fish and shellfish stew) Paella (Spanish rice dish usually made with shrimp) Jambalaya (Cajun rice dish often made with shrimp or crawfish) Nam prik (Thai fish sauce) Mam tom (Vietnamese fish sauce) Tips for Dining Out By following certain guidelines and preparation, eating out can still be a safe and enjoyable experience. Take these steps to protect yourself: Know the safest restaurants: Strict kosher restaurants, as well as vegan and vegetarian restaurants, will not contain shellfish or shellfish products. Check the menu online: Before heading out, review the menu on the restaurant website for shellfish dishes. Many restaurants include information on the most common food allergens, including shellfish. Reviewing the menu can give you a good idea about whether options look safe for you. Keep in mind this won't confirm there are no shellfish ingredients, such as in sauces and stock. Consider chain restaurants: Each restaurant is likely to use the same ingredients and prepare foods the same way and a growing number of them are allergy-aware. This can be a helpful option especially when you’re traveling and don't know the local restaurants. Talk with your server and chef: When you arrive, make sure your server and the chef are aware of your allergies. Ask what is in your dish and how it’s prepared. If you're not confident the wait staff fully understand your situation, speak to a manager. Bring a chef card: You can download a "food allergy alert chef card" from the Food Allergy Research and Education website. 3 This wallet-sized card lists your food allergies and states that your food must be cooked in a clean and safe area to avoid cross-contamination. Ask the wait staff to show it to the chef(s) on duty. Always bring your rescue medication: While it's unlikely that you'll need it, always bring your rescue medication with you, such as your epinephrine autoinjector and, if applicable, any asthma medication . Carrying rescue medication can provide peace of mind so you can relax and enjoy your meal. Consider wearing medical identification, such as a bracelet or necklace that identifies your allergies. Non-Food Sources of Shellfish When you have a severe shellfish allergy, you also need to be aware of potential non-food sources of the allergen. These can include: Compost or fertilizers Fish food Pet food HemCon bandages (a wound dressing made from shrimp shells) Calcium supplements made from oyster shells or coral Glucosamine Omega-3 supplements (usually made from fish, but sometimes made from shellfish) Frequently Asked Questions Yes, developing a shellfish allergy as an adult is possible. Around 60% of individuals with this allergy experience their first symptoms in adulthood. This may happen because some people do not try shellfish until they are older. 4 A shellfish allergy rarely goes away. Most people keep their allergy. However, 46% of people with a shrimp allergy outgrew it within 10 years. 5 The primary allergen in shellfish is a protein called tropomyosin. Others include parvalbumin and arginine kinase. In all, there are around 20 individual proteins that are potential allergens in shellfish. 6 It depends on the severity of the reaction. Also, some people have a second wave of symptoms after the first one resolves, called a biphasic reaction, so it's advisable that someone who has a severe reaction to seafood be observed in a hospital for at least six hours. 7 Keep in mind, too, that symptoms of seafood allergies don't always occur immediately; it could take several hours for them to develop. 8 8 Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. American College of Allergy, Asthma, and Immunology. Shellfish . Lopata AL, Kleine-Tebbe J, Kamath SD. Allergens and molecular diagnostics of shellfish allergy: Part 22 of the Series Molecular Allergology . Allergo J Int . 2016;25(7):210–218. doi:10.1007/s40629-016-0124-2 Food Allergy Research and Education. Food allergy chef cards . Food Allergy Education and Research. Shellfish allergy . UCDavis Health. What you need to know about shellfish allergy diagnosis, treatment . Ruethers T, Taki AC, Johnston EB, et al. Seafood allergy: A comprehensive review of fish and shellfish allergens . Mol Immunol . 2018;100:28-57. doi:10.1016/j.molimm.2018.04.008 Food Allergy Research & Education. Common questions . Australasian Society of Clinical Immunology and Allergy. Allergic and toxic reactions to seafood . By Jeanette Bradley Jeanette Bradley is a noted food allergy advocate and author of the cookbook, "Food Allergy Kitchen Wizardry: 125 Recipes for People with Allergies" Was this page helpful? Thanks for your feedback! What is your feedback?

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Ⓒ 2026 People Inc. — All rights reserved # Foods to Avoid When You Have a Shellfish Allergy By [Jeanette Bradley](https://www.verywellhealth.com/jeanette-bradley-4705338) Updated on February 26, 2026 Medically reviewed by [Daniel More, MD](https://www.verywellhealth.com/daniel-more-md-82606) Table of Contents View All Table of Contents - [Shellfish Types](https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478#toc-which-shellfish-are-known-to-cause-allergic-reactions) - [Symptoms](https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478#toc-how-can-you-tell-if-you-have-a-shellfish-allergy) - [Diagnosis](https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478#toc-how-do-doctors-diagnose-shellfish-allergies) - [Safety Tips](https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478#toc-strategies-for-keeping-shellfish-out-of-your-meals) - [Recipes to Avoid](https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478#toc-recipes-to-avoid) - [Tips for Dining Out](https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478#toc-tips-for-dining-out) - [Non-Food Sources](https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478#toc-non-food-sources-of-shellfish) - [FAQ](https://www.verywellhealth.com/shellfish-allergy-diet-foods-to-avoid-1324478#toc-faq-6246f83a-4dbc-4ec2-871d-4add33e18c0c) - If you have a shellfish allergy, avoid all shellfish, including shrimp and clams. - Always read food labels carefully, as allergens like mollusks may not be disclosed. - Avoid seafood restaurants and some cuisines. Cross-contamination can happen easily. If you have a shellfish allergy, the risk of anaphylaxis means you must stay clear of obvious foods like shrimp and lobster but also lesser-known culprits like mollusks and certain sauces. Understanding what to avoid and where shellfish may be hiding can help you keep safe while dining out or cooking at home. ![Foods That Trigger Shellfish Allergies](https://www.verywellhealth.com/thmb/GL1v14nwzLXRODCbvgK8rvogJl4=/1500x0/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/shellfish-allergy-diet-foods-to-avoid-1324478_V2-eb5d31ca5f1f451eb6f98f75043c4e82.png) ![Foods That Trigger Shellfish Allergies](https://www.verywellhealth.com/thmb/GL1v14nwzLXRODCbvgK8rvogJl4=/1500x0/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/shellfish-allergy-diet-foods-to-avoid-1324478_V2-eb5d31ca5f1f451eb6f98f75043c4e82.png) Verywell / Brianna Gilmartin ## Which Shellfish Are Known to Cause Allergic Reactions? Shellfish are categorized into two families: mollusks and crustaceans. It's possible to be allergic to just one family. For instance, some people react to crustaceans but not mollusks.1 If you're allergic to one type of crustacean, such as crab, you're likely allergic to others, like shrimp. However, many individuals who are allergic to one shellfish family are allergic to both. Always consult your healthcare provider before consuming shellfish from either family if you have an allergy.2 Crustaceans - Crab - Crawfish (crayfish, crawdads) - Langoustines - Lobster - Prawns - Sea urchin - Shrimp Mollusks - Abalone - Clams (quahogs) - Cockles - Limpets - Mussels - Octopus - Oysters - Scallops - Snails (escargot; both sea and land snails) - Squid (calamari) - Surimi (imitation shellfish, often found in sushi) - Whelks Unfortunately, food packaging may not warn you about all shellfish. [U.S. food labeling laws](https://www.verywellhealth.com/can-you-have-malt-if-you-re-gluten-sensitive-4139861) cover crustaceans but not mollusks. Only foods made with crustaceans must be identified in allergy warning labels, which can be problematic for those with severe mollusk allergies. Most food packaging will highlight (or at least list) mollusk ingredients. By carefully reading the package ingredient list, you should be able to identify mollusk-containing foods. For example, a jar of white clam sauce almost certainly will contain clams or clam juice. You'll know to steer clear of it. And fried calamari, also known as fried squid, will include calamari. Make sure to read food labels carefully. When in doubt, don't eat the food you're not sure about. ## How Can You Tell If You Have a Shellfish Allergy? Crustaceans cause the most allergic reactions. Symptoms of shellfish allergy can include:1 - Vomiting - Stomach cramps - Indigestion - Diarrhea - Wheezing - Shortness of breath, difficulty breathing - Repetitive cough - Tightness in throat, hoarse voice - Weak pulse - Pale or blue coloring of the skin - Hives - Swelling, can affect the tongue and/or lips - Dizziness - Confusion ## How Do Doctors Diagnose Shellfish Allergies? Diagnosing shellfish allergies can be complicated for the following reasons:1 - Symptoms can vary from person to person. - Symptoms may not be the same during every reaction. - People may react even if they don't eat shellfish. They can react if they are close to shellfish being cooked or if their food comes in contact with shellfish. If a shellfish allergy is suspected, your healthcare provider will likely refer you to an [allergist](https://www.verywellhealth.com/how-to-interpret-the-rast-test-results-1324055). To make a diagnosis, allergists will usually do the following:1 - Take a history of your allergy symptoms - Perform a skin-prick test, which involves placing a drop of the allergen (allergy-triggering substance) on your skin, and then pricking your skin. If a red, itchy bump appears after 15 to 20 minutes, it confirms an allergy. - Possibly order a blood test that indicates whether food-specific immunoglobulin E (IgE) antibodies are present in your body ## Strategies for Keeping Shellfish Out of Your Meals If you have a shellfish allergy, exercise caution when dining out. Restaurants and markets often store shellfish together, which can lead to [cross-contamination](https://www.verywellhealth.com/food-making-you-sick-allergy-elimination-diet-may-help-1324053).1 For those with severe allergies, avoiding seafood restaurants might be necessary, as allergens from cooking can become airborne. Depending on your allergy's severity, you may want to avoid certain cuisines, such as: - Chinese, Japanese, Thai, Vietnamese, or Malaysian foods, which often include a fish sauce made from shrimp or imitation shellfish - Cajun or Creole food, which frequently contains shrimp or other shellfish Some restaurants use shellfish stock in sauces or soups. Always inform your server or manager about your allergy and verify if any dishes you're considering contain shellfish. ## Recipes to Avoid Shellfish is an ingredient in numerous recipes, although it may not always be obvious. Be on the lookout for these dishes and ingredients in restaurants. Also be careful when eating food prepared by friends or relatives: - Bouillabaisse (a French fish soup) - Ceviche (fish or shellfish in an acidic citrus marinade) - Cioppino (fish stew) - Clamato (a clam broth and tomato juice mixture sometimes used in Bloody Mary drinks) - Crevette (the French term for shrimp) - Scampi (contains lobster or shrimp) - Etouffée (Cajun crawfish dish) - Gumbo (fish and shellfish stew) - Paella (Spanish rice dish usually made with shrimp) - Jambalaya (Cajun rice dish often made with shrimp or crawfish) - Nam prik (Thai fish sauce) - Mam tom (Vietnamese fish sauce) ## Tips for Dining Out By following certain guidelines and preparation, [eating out can still be a safe](https://www.verywellhealth.com/can-you-have-malt-if-you-re-gluten-sensitive-4139861) and enjoyable experience. Take these steps to protect yourself: - **Know the safest restaurants:** Strict [kosher](https://www.verywellhealth.com/the-most-common-food-allergies-1324134) restaurants, as well as vegan and vegetarian restaurants, will not contain shellfish or shellfish products. - **Check the menu online:** Before heading out, review the menu on the restaurant website for shellfish dishes. Many restaurants include information on the most common food allergens, including shellfish. Reviewing the menu can give you a good idea about whether options look safe for you. Keep in mind this won't confirm there are no shellfish ingredients, such as in sauces and stock. - **Consider chain restaurants:** Each restaurant is likely to use the same ingredients and prepare foods the same way and a growing number of them are allergy-aware. This can be a helpful option especially when you’re traveling and don't know the local restaurants. - **Talk with your server and chef:** When you arrive, make sure your server and the chef are aware of your allergies. Ask what is in your dish and how it’s prepared. If you're not confident the wait staff fully understand your situation, speak to a manager. - **Bring a chef card:** You can download a "food allergy alert chef card" from the Food Allergy Research and Education website.3 This wallet-sized card lists your food allergies and states that your food must be cooked in a clean and safe area to avoid cross-contamination. Ask the wait staff to show it to the chef(s) on duty. - **Always bring your rescue medication:** While it's unlikely that you'll need it, always bring your rescue medication with you, such as your epinephrine autoinjector and, if applicable, any [asthma medication](https://www.verywellhealth.com/asthma-treatment-4014205). Carrying rescue medication can provide peace of mind so you can relax and enjoy your meal. Consider wearing medical identification, such as a bracelet or necklace that identifies your allergies. ## Non-Food Sources of Shellfish When you have a severe shellfish allergy, you also need to be aware of potential non-food sources of the allergen. These can include: - Compost or fertilizers - Fish food - Pet food - HemCon bandages (a wound dressing made from shrimp shells) - [Calcium supplements](https://www.verywellhealth.com/herbs-for-osteoporosis-5206635) made from oyster shells or coral - Glucosamine - [Omega-3 supplements](https://www.verywellhealth.com/fish-allergy-and-omega-3-supplements-1324477) (usually made from fish, but sometimes made from shellfish) ### Frequently Asked Questions - Can you develop a shellfish allergy as an adult? Yes, developing a shellfish allergy as an adult is possible. Around 60% of individuals with this allergy experience their first symptoms in adulthood. This may happen because some people do not try shellfish until they are older.4 - Can a shellfish allergy go away? A shellfish allergy rarely goes away. Most people keep their allergy. However, 46% of people with a shrimp allergy outgrew it within 10 years.5 - What component of shellfish causes an allergic reaction? The primary allergen in shellfish is a protein called tropomyosin. Others include parvalbumin and arginine kinase. In all, there are around 20 individual proteins that are potential allergens in shellfish.6 Learn More: [What Causes Food Allergies?](https://www.verywellhealth.com/food-allergies-causes-and-risk-factors-4685818) - How long do shellfish allergy symptoms last? It depends on the severity of the reaction. Also, some people have a second wave of symptoms after the first one resolves, called a biphasic reaction, so it's advisable that someone who has a severe reaction to seafood be observed in a hospital for at least six hours.7 Keep in mind, too, that symptoms of seafood allergies don't always occur immediately; it could take several hours for them to develop.8 Learn More: [How Anaphylaxis Is Treated](https://www.verywellhealth.com/anaphylaxis-7375994) Read more: - [Health A-Z](https://www.verywellhealth.com/health-a-z-4014770) - [Allergies](https://www.verywellhealth.com/allergies-overview-4581761) - [Food Allergies](https://www.verywellhealth.com/food-allergy-overview-4581969) - [Living With](https://www.verywellhealth.com/food-allergy-living-with-4013293) 8 Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our [editorial process](https://www.verywellhealth.com/verywell-editorial-process-4777042) to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. 1. American College of Allergy, Asthma, and Immunology. [Shellfish](https://acaai.org/allergies/allergic-conditions/food/shellfish/). 2. Lopata AL, Kleine-Tebbe J, Kamath SD. [Allergens and molecular diagnostics of shellfish allergy: Part 22 of the Series Molecular Allergology](https://doi.org/10.1007/s40629-016-0124-2). *Allergo J Int*. 2016;25(7):210–218. doi:10.1007/s40629-016-0124-2 3. Food Allergy Research and Education. [Food allergy chef cards](https://www.foodallergy.org/resources/food-allergy-chef-cards). 4. Food Allergy Education and Research. [Shellfish allergy](https://www.foodallergy.org/living-food-allergies/food-allergy-essentials/common-allergens/shellfish). 5. UCDavis Health. [What you need to know about shellfish allergy diagnosis, treatment](https://health.ucdavis.edu/news/headlines/what-you-need-to-know-about-shellfish-allergy-diagnosis-treatment/2022/10). 6. Ruethers T, Taki AC, Johnston EB, et al. [Seafood allergy: A comprehensive review of fish and shellfish allergens](https://dx.doi.org/10.1016/j.molimm.2018.04.008). *Mol Immunol*. 2018;100:28-57. doi:10.1016/j.molimm.2018.04.008 7. Food Allergy Research & Education. [Common questions](https://www.foodallergy.org/resources/common-questions). 8. Australasian Society of Clinical Immunology and Allergy. [Allergic and toxic reactions to seafood](https://www.allergy.org.au/images/pcc/ASCIA_PCC_Allergic_Reactions_seafood_2014.pdf). ![Jeanette Bradley](https://www.verywellhealth.com/thmb/4lYN3LgyZ4iOlxYLnon69_KWD5w=/144x144/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/Jeanette-Bradley-1000-d3d86f62b25141a793edfc8b57fe11a3.jpg) ![Jeanette Bradley](https://www.verywellhealth.com/thmb/4lYN3LgyZ4iOlxYLnon69_KWD5w=/144x144/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/Jeanette-Bradley-1000-d3d86f62b25141a793edfc8b57fe11a3.jpg) By [Jeanette Bradley](https://www.verywellhealth.com/jeanette-bradley-4705338) Jeanette Bradley is a noted food allergy advocate and author of the cookbook, "Food Allergy Kitchen Wizardry: 125 Recipes for People with Allergies" [See Our Editorial Process](https://www.verywellhealth.com/verywell-editorial-process-4777042) [Meet Our Medical Expert Board](https://www.verywellhealth.com/meet-our-medical-expert-board-11762003) Share Feedback Was this page helpful? 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Everything You Need to Know](https://www.verywellhealth.com/histamine-intolerance-1324016) [![Cashews in a bowl on a table](https://www.verywellhealth.com/thmb/K2EAqnarVT0RYy-FcC9SevXz-U8=/400x250/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/GettyImages-544546055-2000-164c015725f448ccbe6b3f60da3f707a.jpg) ![Cashews in a bowl on a table](https://www.verywellhealth.com/thmb/K2EAqnarVT0RYy-FcC9SevXz-U8=/400x250/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/GettyImages-544546055-2000-164c015725f448ccbe6b3f60da3f707a.jpg) How to Identify and Manage a Cashew Allergy](https://www.verywellhealth.com/cashew-allergy-5223784) - [Health A-Z](https://www.verywellhealth.com/health-a-z-4014770) - [Prevention & Treatment](https://www.verywellhealth.com/prevention-and-treatment-4158390) - [Health Care](https://www.verywellhealth.com/health-care-4014769) - [News](https://www.verywellhealth.com/news-4846412) - [Meet Our Review Board](https://www.verywellhealth.com/meet-our-medical-expert-board-11762003) - [About Us](https://www.verywellhealth.com/about-us-5180305) - [Editorial Process](https://www.verywellhealth.com/verywell-editorial-process-4777042) - [Privacy Policy](https://www.people.inc/brands-privacy) - [In the News](https://www.verywellhealth.com/in-the-news-4778971) - [Advertise](https://www.people.inc/advertising) - [Terms of Service](https://www.people.inc/brands-termsofservice) - [Careers](https://www.people.inc/careers) - [Contact](https://www.verywellhealth.com/about-us-5180305#toc-contact-us) Follow Us Verywell Health's content is for informational and educational purposes only. 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- If you have a shellfish allergy, avoid all shellfish, including shrimp and clams. - Always read food labels carefully, as allergens like mollusks may not be disclosed. - Avoid seafood restaurants and some cuisines. Cross-contamination can happen easily. If you have a shellfish allergy, the risk of anaphylaxis means you must stay clear of obvious foods like shrimp and lobster but also lesser-known culprits like mollusks and certain sauces. Understanding what to avoid and where shellfish may be hiding can help you keep safe while dining out or cooking at home. Verywell / Brianna Gilmartin ## Which Shellfish Are Known to Cause Allergic Reactions? Shellfish are categorized into two families: mollusks and crustaceans. It's possible to be allergic to just one family. For instance, some people react to crustaceans but not mollusks.1 If you're allergic to one type of crustacean, such as crab, you're likely allergic to others, like shrimp. However, many individuals who are allergic to one shellfish family are allergic to both. Always consult your healthcare provider before consuming shellfish from either family if you have an allergy.2 Crustaceans - Crab - Crawfish (crayfish, crawdads) - Langoustines - Lobster - Prawns - Sea urchin - Shrimp Mollusks - Abalone - Clams (quahogs) - Cockles - Limpets - Mussels - Octopus - Oysters - Scallops - Snails (escargot; both sea and land snails) - Squid (calamari) - Surimi (imitation shellfish, often found in sushi) - Whelks Unfortunately, food packaging may not warn you about all shellfish. [U.S. food labeling laws](https://www.verywellhealth.com/can-you-have-malt-if-you-re-gluten-sensitive-4139861) cover crustaceans but not mollusks. Only foods made with crustaceans must be identified in allergy warning labels, which can be problematic for those with severe mollusk allergies. Most food packaging will highlight (or at least list) mollusk ingredients. By carefully reading the package ingredient list, you should be able to identify mollusk-containing foods. For example, a jar of white clam sauce almost certainly will contain clams or clam juice. You'll know to steer clear of it. And fried calamari, also known as fried squid, will include calamari. Make sure to read food labels carefully. When in doubt, don't eat the food you're not sure about. ## How Can You Tell If You Have a Shellfish Allergy? Crustaceans cause the most allergic reactions. Symptoms of shellfish allergy can include:1 - Vomiting - Stomach cramps - Indigestion - Diarrhea - Wheezing - Shortness of breath, difficulty breathing - Repetitive cough - Tightness in throat, hoarse voice - Weak pulse - Pale or blue coloring of the skin - Hives - Swelling, can affect the tongue and/or lips - Dizziness - Confusion ## How Do Doctors Diagnose Shellfish Allergies? Diagnosing shellfish allergies can be complicated for the following reasons:1 - Symptoms can vary from person to person. - Symptoms may not be the same during every reaction. - People may react even if they don't eat shellfish. They can react if they are close to shellfish being cooked or if their food comes in contact with shellfish. If a shellfish allergy is suspected, your healthcare provider will likely refer you to an [allergist](https://www.verywellhealth.com/how-to-interpret-the-rast-test-results-1324055). To make a diagnosis, allergists will usually do the following:1 - Take a history of your allergy symptoms - Perform a skin-prick test, which involves placing a drop of the allergen (allergy-triggering substance) on your skin, and then pricking your skin. If a red, itchy bump appears after 15 to 20 minutes, it confirms an allergy. - Possibly order a blood test that indicates whether food-specific immunoglobulin E (IgE) antibodies are present in your body ## Strategies for Keeping Shellfish Out of Your Meals If you have a shellfish allergy, exercise caution when dining out. Restaurants and markets often store shellfish together, which can lead to [cross-contamination](https://www.verywellhealth.com/food-making-you-sick-allergy-elimination-diet-may-help-1324053).1 For those with severe allergies, avoiding seafood restaurants might be necessary, as allergens from cooking can become airborne. Depending on your allergy's severity, you may want to avoid certain cuisines, such as: - Chinese, Japanese, Thai, Vietnamese, or Malaysian foods, which often include a fish sauce made from shrimp or imitation shellfish - Cajun or Creole food, which frequently contains shrimp or other shellfish Some restaurants use shellfish stock in sauces or soups. Always inform your server or manager about your allergy and verify if any dishes you're considering contain shellfish. ## Recipes to Avoid Shellfish is an ingredient in numerous recipes, although it may not always be obvious. Be on the lookout for these dishes and ingredients in restaurants. Also be careful when eating food prepared by friends or relatives: - Bouillabaisse (a French fish soup) - Ceviche (fish or shellfish in an acidic citrus marinade) - Cioppino (fish stew) - Clamato (a clam broth and tomato juice mixture sometimes used in Bloody Mary drinks) - Crevette (the French term for shrimp) - Scampi (contains lobster or shrimp) - Etouffée (Cajun crawfish dish) - Gumbo (fish and shellfish stew) - Paella (Spanish rice dish usually made with shrimp) - Jambalaya (Cajun rice dish often made with shrimp or crawfish) - Nam prik (Thai fish sauce) - Mam tom (Vietnamese fish sauce) ## Tips for Dining Out By following certain guidelines and preparation, [eating out can still be a safe](https://www.verywellhealth.com/can-you-have-malt-if-you-re-gluten-sensitive-4139861) and enjoyable experience. Take these steps to protect yourself: - **Know the safest restaurants:** Strict [kosher](https://www.verywellhealth.com/the-most-common-food-allergies-1324134) restaurants, as well as vegan and vegetarian restaurants, will not contain shellfish or shellfish products. - **Check the menu online:** Before heading out, review the menu on the restaurant website for shellfish dishes. Many restaurants include information on the most common food allergens, including shellfish. Reviewing the menu can give you a good idea about whether options look safe for you. Keep in mind this won't confirm there are no shellfish ingredients, such as in sauces and stock. - **Consider chain restaurants:** Each restaurant is likely to use the same ingredients and prepare foods the same way and a growing number of them are allergy-aware. This can be a helpful option especially when you’re traveling and don't know the local restaurants. - **Talk with your server and chef:** When you arrive, make sure your server and the chef are aware of your allergies. Ask what is in your dish and how it’s prepared. If you're not confident the wait staff fully understand your situation, speak to a manager. - **Bring a chef card:** You can download a "food allergy alert chef card" from the Food Allergy Research and Education website.3 This wallet-sized card lists your food allergies and states that your food must be cooked in a clean and safe area to avoid cross-contamination. Ask the wait staff to show it to the chef(s) on duty. - **Always bring your rescue medication:** While it's unlikely that you'll need it, always bring your rescue medication with you, such as your epinephrine autoinjector and, if applicable, any [asthma medication](https://www.verywellhealth.com/asthma-treatment-4014205). Carrying rescue medication can provide peace of mind so you can relax and enjoy your meal. Consider wearing medical identification, such as a bracelet or necklace that identifies your allergies. ## Non-Food Sources of Shellfish When you have a severe shellfish allergy, you also need to be aware of potential non-food sources of the allergen. These can include: - Compost or fertilizers - Fish food - Pet food - HemCon bandages (a wound dressing made from shrimp shells) - [Calcium supplements](https://www.verywellhealth.com/herbs-for-osteoporosis-5206635) made from oyster shells or coral - Glucosamine - [Omega-3 supplements](https://www.verywellhealth.com/fish-allergy-and-omega-3-supplements-1324477) (usually made from fish, but sometimes made from shellfish) ### Frequently Asked Questions - Yes, developing a shellfish allergy as an adult is possible. Around 60% of individuals with this allergy experience their first symptoms in adulthood. This may happen because some people do not try shellfish until they are older.4 - A shellfish allergy rarely goes away. Most people keep their allergy. However, 46% of people with a shrimp allergy outgrew it within 10 years.5 - The primary allergen in shellfish is a protein called tropomyosin. Others include parvalbumin and arginine kinase. In all, there are around 20 individual proteins that are potential allergens in shellfish.6 - It depends on the severity of the reaction. Also, some people have a second wave of symptoms after the first one resolves, called a biphasic reaction, so it's advisable that someone who has a severe reaction to seafood be observed in a hospital for at least six hours.7 Keep in mind, too, that symptoms of seafood allergies don't always occur immediately; it could take several hours for them to develop.8 8 Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our [editorial process](https://www.verywellhealth.com/verywell-editorial-process-4777042) to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. 1. American College of Allergy, Asthma, and Immunology. [Shellfish](https://acaai.org/allergies/allergic-conditions/food/shellfish/). 2. Lopata AL, Kleine-Tebbe J, Kamath SD. [Allergens and molecular diagnostics of shellfish allergy: Part 22 of the Series Molecular Allergology](https://doi.org/10.1007/s40629-016-0124-2). *Allergo J Int*. 2016;25(7):210–218. doi:10.1007/s40629-016-0124-2 3. Food Allergy Research and Education. [Food allergy chef cards](https://www.foodallergy.org/resources/food-allergy-chef-cards). 4. Food Allergy Education and Research. [Shellfish allergy](https://www.foodallergy.org/living-food-allergies/food-allergy-essentials/common-allergens/shellfish). 5. UCDavis Health. [What you need to know about shellfish allergy diagnosis, treatment](https://health.ucdavis.edu/news/headlines/what-you-need-to-know-about-shellfish-allergy-diagnosis-treatment/2022/10). 6. Ruethers T, Taki AC, Johnston EB, et al. [Seafood allergy: A comprehensive review of fish and shellfish allergens](https://dx.doi.org/10.1016/j.molimm.2018.04.008). *Mol Immunol*. 2018;100:28-57. doi:10.1016/j.molimm.2018.04.008 7. Food Allergy Research & Education. [Common questions](https://www.foodallergy.org/resources/common-questions). 8. Australasian Society of Clinical Immunology and Allergy. [Allergic and toxic reactions to seafood](https://www.allergy.org.au/images/pcc/ASCIA_PCC_Allergic_Reactions_seafood_2014.pdf). ![Jeanette Bradley](https://www.verywellhealth.com/thmb/4lYN3LgyZ4iOlxYLnon69_KWD5w=/144x144/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/Jeanette-Bradley-1000-d3d86f62b25141a793edfc8b57fe11a3.jpg) By [Jeanette Bradley](https://www.verywellhealth.com/jeanette-bradley-4705338) Jeanette Bradley is a noted food allergy advocate and author of the cookbook, "Food Allergy Kitchen Wizardry: 125 Recipes for People with Allergies" Was this page helpful? Thanks for your feedback\! What is your feedback?

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