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[Medically reviewed]() by [Alana Biggers, M.D., MPH]() — Written by [Sandra Silva]() on May 1, 2025 Shellfish allergy symptoms typically develop within minutes after ingesting seafood or shellfish. They can last from several hours to a few days, depending on the severity of the reaction and the treatment you have. Mild symptoms of shellfish allergies, such as hives or gastrointestinal symptoms, may resolve within a few hours, especially if you take an antihistamine like loratadine. Severe reactions, like anaphylaxis, require immediate medical care and may require more extended recovery periods. **MORE ON THIS:** [What are the symptoms of shellfish allergies?](https://www.healthline.com/health/shellfish-allergy-symptoms) ## [How long should I wait for symptoms to resolve?]() Immediate medical care is essential if you experience [shellfish allergy](https://www.healthline.com/health/allergies/shellfish) symptoms that may indicate [anaphylaxis](https://www.healthline.com/health/anaphylaxis), a severe and potentially life threatening allergic reaction. These symptoms include: - difficulty breathing or swallowing - itching, swelling, or tightness of the throat - severe swelling of the mouth, tongue, and eyes - sudden changes in blood pressure - lightheadedness or dizziness - fainting Symptoms of anaphylaxis can [worsen quickly](https://www.healthline.com/health/allergies/timeline-anaphylactic-reaction), so don’t wait to see whether they resolve on their own. You may need an epinephrine injection or other urgent care. If your symptoms of shellfish allergy are mild and do not worsen with time, immediate medical care may not be required. Mild symptoms may include diarrhea, headache, upset stomach, and hives. If you’ve had an allergic reaction to shellfish or seafood, even if mild, you may want to consult a healthcare professional for [allergy testing](https://www.healthline.com/health/allergy-testing). Proper diagnosis may avoid future emergencies, as allergic reactions may change in severity. They may also guide you about what to do if you ever have another allergic reaction to shellfish or other foods, and whether oral antihistamines are indicated in your case. If you suspect a shellfish allergy or any other type of allergy, check out our [guide to visiting an allergist](https://www.healthline.com/health/allergies/allergist-visit-guide). ### How we reviewed this article: Sources History Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our [editorial policy](https://www.healthline.com/about/process). - Alonso LL, et al. (2022). Shellfish allergy. <https://www.ncbi.nlm.nih.gov/books/NBK448089/> - Shellfish. (2019). <https://acaai.org/allergies/allergic-conditions/food/shellfish/> Share this article  [Medically reviewed]() by [Alana Biggers, M.D., MPH]() — Written by [Sandra Silva]() on May 1, 2025 ## related stories - [4 Tips for Hosting People with Food Allergies](https://www.healthline.com/health/how-to-host-people-with-food-allergies?utm_source=ReadNext) - [Can Food Allergies Cause Mouth Sores?](https://www.healthline.com/health/food-allergies-that-cause-mouth-sores?utm_source=ReadNext) - [Are You Allergic or Intolerant? 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Shellfish allergy symptoms typically develop within minutes after ingesting seafood or shellfish. They can last from several hours to a few days, depending on the severity of the reaction and the treatment you have. Mild symptoms of shellfish allergies, such as hives or gastrointestinal symptoms, may resolve within a few hours, especially if you take an antihistamine like loratadine. Severe reactions, like anaphylaxis, require immediate medical care and may require more extended recovery periods. ## Immediate medical care is essential if you experience [shellfish allergy](https://www.healthline.com/health/allergies/shellfish) symptoms that may indicate [anaphylaxis](https://www.healthline.com/health/anaphylaxis), a severe and potentially life threatening allergic reaction. These symptoms include: - difficulty breathing or swallowing - itching, swelling, or tightness of the throat - severe swelling of the mouth, tongue, and eyes - sudden changes in blood pressure - lightheadedness or dizziness - fainting Symptoms of anaphylaxis can [worsen quickly](https://www.healthline.com/health/allergies/timeline-anaphylactic-reaction), so don’t wait to see whether they resolve on their own. You may need an epinephrine injection or other urgent care. If your symptoms of shellfish allergy are mild and do not worsen with time, immediate medical care may not be required. Mild symptoms may include diarrhea, headache, upset stomach, and hives. If you’ve had an allergic reaction to shellfish or seafood, even if mild, you may want to consult a healthcare professional for [allergy testing](https://www.healthline.com/health/allergy-testing). Proper diagnosis may avoid future emergencies, as allergic reactions may change in severity. They may also guide you about what to do if you ever have another allergic reaction to shellfish or other foods, and whether oral antihistamines are indicated in your case.