🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 40 (from laksa017)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa040.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.mayoclinic.org/symptoms/loss-of-smell/basics/causes/sym-20050804\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.mayoclinic.org/symptoms/loss-of-smell/basics/causes/sym-20050804\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.mayoclinic.org\/symptoms\/loss-of-smell\/basics\/causes\/sym-20050804","crawl_time":1775019794,"first_indexed_time":1475524333,"http_code":200,"src_unparsed":"org,mayoclinic!www,\/symptoms\/loss-of-smell\/basics\/causes\/sym-20050804 s443","src_root_hash":"1608882045018104440","history_drop_reason":null,"meta_title":"Loss of smell (anosmia) Causes - Mayo Clinic","meta_descriptions":["A stuffy nose is one cause of this symptom. Learn about other causes and when it might be serious."],"attrs_boilerpipe_text":"A stuffy nose from a cold is a common cause for a partial, brief loss of smell. A polyp or swelling inside the nose can lead to a loss of smell. Aging can cause a loss of smell, especially after age 60.\nWhat is smell?\nThe nose and an area in the upper throat have special cells, called receptors, that discern odors. These receptors send a message to the brain about each smell. The brain then figures out what the smell is.\nAny problem along the way can affect the sense of smell. Problems can include a stuffy nose; something that blocks the nose; swelling, called inflammation; nerve damage; or an issue with how the brain works.\nProblems with the inner lining of the nose\nConditions that cause congestion or other issues inside the nose may include:\nAcute sinusitis\nChronic sinusitis\nCommon cold\nCoronavirus disease 2019 (COVID-19)\nHay fever\nInfluenza (flu)\nNonallergic rhinitis\nSmoking\nBlockages in the inside of the nose, called the nasal passages\nConditions that block the flow of air through the nose can include:\nNasal polyps\nTumors\nDamage to your brain or nerves\nThe following can cause damage to the nerves to the area of the brain that picks up smells or to the brain itself to:\nAging\nAlzheimer's disease\nBeing around toxic chemicals, such as those used in solvents\nBrain aneurysm\nBrain surgery\nBrain tumor\nDiabetes\nHuntington's disease\nHypothyroidism (underactive thyroid)\nKallmann's syndrome (a rare genetic condition)\nKorsakoff's psychosis, a brain condition caused by the lack of vitamin B-1, also called thiamin\nLewy body dementia\nMedicines, such as some for high blood pressure, some antibiotics and antihistamines, and some nasal sprays\nMultiple sclerosis\nParkinson's disease\nPoor nutrition, such as too little zinc or vitamin B-12 in the diet\nPseudotumor cerebri (idiopathic intracranial hypertension)\nRadiation therapy\nRhinoplasty\nTraumatic brain injury\nCauses shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.\nFrom Mayo Clinic to your inbox\nSign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health.\nClick here for an email preview.\nEmail\nWe use the data you provide to deliver you the content you requested. To provide you with the most relevant and helpful information, we may combine your email and website data with other information we have about you. If you are a Mayo Clinic patient, we will only use your protected health information as outlined in our\nNotice of Privacy Practices\n. You may opt out of email communications at any time by clicking on the unsubscribe link in the email.\nShare\nTweet\nDec. 24, 2025\nFerri FF. T-differential diagnosis. In: Ferri's Clinical Advisor 2023. Elsevier; 2023. https:\/\/www.clinicalkey.com. Accessed April 6, 2023.\nSmell disorders. National Institute on Deafness and Other Communication Disorders. https:\/\/www.nidcd.nih.gov\/health\/smell-disorders. Accessed April 6, 2023.\nLalwani AK. Olfactory dysfunction. In: Current Diagnosis & Treatment in Otolaryngology — Head & Neck Surgery. 4th ed. McGraw Hill; 2020. https:\/\/accessmedicine.mhmedical.com. Accessed April 6, 2023.\nLafreniere D. Taste and olfactory disorders in adults: Anatomy and etiology. https:\/\/www.uptodate.com\/contents\/search. Accessed April 7, 2023.\nAnosmia. Merck Manual Professional Version. https:\/\/www.merckmanuals.com\/professional\/ear,-nose,-and-throat-disorders\/approach-to-the-patient-with-nasal-and-pharyngeal-symptoms\/anosmia. Accessed April 6, 2023.\nSee also\nBardet-Biedl syndrome (BBS)\nChronic sinusitis\nCoronavirus disease 2019 (COVID-19)\nCoronavirus infection by race\nCOVID-19 and pets\nCOVID-19 and vitamin D\nCOVID-19 and your mental health\nCOVID-19 drugs: Are there any that work?\nCOVID-19 in babies and children\nCOVID-19 travel advice\nCOVID-19 vaccines for kids: What you need to know\nCOVID-19 vaccines: Get the facts\nCOVID-19 variants\nCOVID-19 vs. flu: Similarities and differences\nCOVID-19, cold, allergies and the flu: What are the differences?\nCOVID-19: How can I protect myself?\nCOVID-19: Who's at higher risk of serious symptoms?\nDebunking COVID-19 myths\nDifferent types of COVID-19 vaccines: How they work\nFight coronavirus (COVID-19) transmission at home\nHerd immunity and COVID-19: What you need to know\nHow do COVID-19 antibody tests differ from diagnostic tests?\nHow well do face masks protect against COVID-19?\nIs hydroxychloroquine a treatment for COVID-19?\nLong COVID: Lasting effects of COVID-19\nLoss of taste and smell\nMayo Clinic Minute: How dirty are common surfaces?\nMayo Clinic Minute: You're washing your hands all wrong\nNasal polyps\nPregnancy and COVID-19: What are the risks?\nSafe outdoor activities during the COVID-19 pandemic\nSafety tips for attending school during COVID-19\nSex and COVID-19\nSkull base tumors\nTreating COVID-19 at home: Care tips for you and others\nUnusual symptoms of coronavirus\n.","attrs_markdown":null,"attrs_readable_markdown":"A stuffy nose from a cold is a common cause for a partial, brief loss of smell. A polyp or swelling inside the nose can lead to a loss of smell. Aging can cause a loss of smell, especially after age 60.\n\n### What is smell?\nThe nose and an area in the upper throat have special cells, called receptors, that discern odors. These receptors send a message to the brain about each smell. The brain then figures out what the smell is.\n\nAny problem along the way can affect the sense of smell. Problems can include a stuffy nose; something that blocks the nose; swelling, called inflammation; nerve damage; or an issue with how the brain works.\n\n### Problems with the inner lining of the nose\nConditions that cause congestion or other issues inside the nose may include:\n\n1. [Acute sinusitis](https:\/\/www.mayoclinic.org\/diseases-conditions\/acute-sinusitis\/symptoms-causes\/syc-20351671)\n2. [Chronic sinusitis](https:\/\/www.mayoclinic.org\/diseases-conditions\/chronic-sinusitis\/symptoms-causes\/syc-20351661)\n3. [Common cold](https:\/\/www.mayoclinic.org\/diseases-conditions\/common-cold\/symptoms-causes\/syc-20351605)\n4. [Coronavirus disease 2019 (COVID-19)](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/symptoms-causes\/syc-20479963)\n5. [Hay fever](https:\/\/www.mayoclinic.org\/diseases-conditions\/hay-fever\/symptoms-causes\/syc-20373039)\n6. [Influenza (flu)](https:\/\/www.mayoclinic.org\/diseases-conditions\/flu\/symptoms-causes\/syc-20351719)\n7. [Nonallergic rhinitis](https:\/\/www.mayoclinic.org\/diseases-conditions\/nonallergic-rhinitis\/symptoms-causes\/syc-20351229)\n8. Smoking\n### Blockages in the inside of the nose, called the nasal passages\nConditions that block the flow of air through the nose can include:\n\n1. [Nasal polyps](https:\/\/www.mayoclinic.org\/diseases-conditions\/nasal-polyps\/symptoms-causes\/syc-20351888)\n2. Tumors\n### Damage to your brain or nerves\nThe following can cause damage to the nerves to the area of the brain that picks up smells or to the brain itself to:\n\n1. Aging\n2. [Alzheimer's disease](https:\/\/www.mayoclinic.org\/diseases-conditions\/alzheimers-disease\/symptoms-causes\/syc-20350447)\n3. Being around toxic chemicals, such as those used in solvents\n4. [Brain aneurysm](https:\/\/www.mayoclinic.org\/diseases-conditions\/brain-aneurysm\/symptoms-causes\/syc-20361483)\n5. Brain surgery\n6. [Brain tumor](https:\/\/www.mayoclinic.org\/diseases-conditions\/brain-tumor\/symptoms-causes\/syc-20350084)\n7. [Diabetes](https:\/\/www.mayoclinic.org\/diseases-conditions\/diabetes\/symptoms-causes\/syc-20371444)\n8. [Huntington's disease](https:\/\/www.mayoclinic.org\/diseases-conditions\/huntingtons-disease\/symptoms-causes\/syc-20356117)\n9. [Hypothyroidism (underactive thyroid)](https:\/\/www.mayoclinic.org\/diseases-conditions\/hypothyroidism\/symptoms-causes\/syc-20350284)\n10. Kallmann's syndrome (a rare genetic condition)\n11. Korsakoff's psychosis, a brain condition caused by the lack of vitamin B-1, also called thiamin\n12. [Lewy body dementia](https:\/\/www.mayoclinic.org\/diseases-conditions\/lewy-body-dementia\/symptoms-causes\/syc-20352025)\n13. Medicines, such as some for high blood pressure, some antibiotics and antihistamines, and some nasal sprays\n14. [Multiple sclerosis](https:\/\/www.mayoclinic.org\/diseases-conditions\/multiple-sclerosis\/symptoms-causes\/syc-20350269)\n15. [Parkinson's disease](https:\/\/www.mayoclinic.org\/diseases-conditions\/parkinsons-disease\/symptoms-causes\/syc-20376055)\n16. Poor nutrition, such as too little zinc or vitamin B-12 in the diet\n17. [Pseudotumor cerebri (idiopathic intracranial hypertension)](https:\/\/www.mayoclinic.org\/diseases-conditions\/pseudotumor-cerebri\/symptoms-causes\/syc-20354031)\n18. [Radiation therapy](https:\/\/www.mayoclinic.org\/tests-procedures\/radiation-therapy\/about\/pac-20385162)\n19. [Rhinoplasty](https:\/\/www.mayoclinic.org\/tests-procedures\/rhinoplasty\/about\/pac-20384532)\n20. [Traumatic brain injury](https:\/\/www.mayoclinic.org\/diseases-conditions\/traumatic-brain-injury\/symptoms-causes\/syc-20378557)\n\nCauses shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.\n\n## From Mayo Clinic to your inbox\nSign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. [Click here for an email preview.](https:\/\/links.e.response.mayoclinic.org\/EmailPreview-GeneralHealth)\n\nEmail\n\nWe use the data you provide to deliver you the content you requested. To provide you with the most relevant and helpful information, we may combine your email and website data with other information we have about you. If you are a Mayo Clinic patient, we will only use your protected health information as outlined in our [Notice of Privacy Practices](https:\/\/mcforms.mayo.edu\/mc5200-mc5299\/mc5256-01.pdf). You may opt out of email communications at any time by clicking on the unsubscribe link in the email.\n\n- [Share](https:\/\/www.facebook.com\/sharer.php?u=https:\/\/www.mayoclinic.org\/symptoms\/loss-of-smell\/basics\/causes\/sym-20050804)\n- [Tweet](http:\/\/twitter.com\/intent\/tweet?url=https:\/\/www.mayoclinic.org\/symptoms\/loss-of-smell\/basics\/causes\/sym-20050804&text=Loss+of+smell+\\(anosmia\\)+Causes)\n\nDec. 24, 2025\n\n1. Ferri FF. T-differential diagnosis. In: Ferri's Clinical Advisor 2023. Elsevier; 2023. https:\/\/www.clinicalkey.com. Accessed April 6, 2023.\n2. Smell disorders. National Institute on Deafness and Other Communication Disorders. https:\/\/www.nidcd.nih.gov\/health\/smell-disorders. Accessed April 6, 2023.\n3. Lalwani AK. Olfactory dysfunction. In: Current Diagnosis & Treatment in Otolaryngology — Head & Neck Surgery. 4th ed. McGraw Hill; 2020. https:\/\/accessmedicine.mhmedical.com. Accessed April 6, 2023.\n4. Lafreniere D. Taste and olfactory disorders in adults: Anatomy and etiology. https:\/\/www.uptodate.com\/contents\/search. Accessed April 7, 2023.\n5. Anosmia. Merck Manual Professional Version. https:\/\/www.merckmanuals.com\/professional\/ear,-nose,-and-throat-disorders\/approach-to-the-patient-with-nasal-and-pharyngeal-symptoms\/anosmia. Accessed April 6, 2023.\n\n## See also\n1. [Bardet-Biedl syndrome (BBS)](https:\/\/www.mayoclinic.org\/diseases-conditions\/bardet-biedl-syndrome\/symptoms-causes\/syc-20586227)\n2. [Chronic sinusitis](https:\/\/www.mayoclinic.org\/diseases-conditions\/chronic-sinusitis\/symptoms-causes\/syc-20351661)\n3. [Coronavirus disease 2019 (COVID-19)](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/symptoms-causes\/syc-20479963)\n4. [Coronavirus infection by race](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/expert-answers\/coronavirus-infection-by-race\/faq-20488802)\n5. [COVID-19 and pets](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/expert-answers\/can-pets-get-coronavirus\/faq-20486391)\n6. [COVID-19 and vitamin D](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/expert-answers\/coronavirus-and-vitamin-d\/faq-20493088)\n7. [COVID-19 and your mental health](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/mental-health-covid-19\/art-20482731)\n8. [COVID-19 drugs: Are there any that work?](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/expert-answers\/coronavirus-drugs\/faq-20485627)\n9. [COVID-19 in babies and children](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/coronavirus-in-babies-and-children\/art-20484405)\n10. [COVID-19 travel advice](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/coronavirus-safe-travel-advice\/art-20486965)\n11. [COVID-19 vaccines for kids: What you need to know](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/covid-19-vaccines-for-kids\/art-20513332)\n12. [COVID-19 vaccines: Get the facts](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/coronavirus-vaccine\/art-20484859)\n13. [COVID-19 variants](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/expert-answers\/covid-variant\/faq-20505779)\n14. [COVID-19 vs. flu: Similarities and differences](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/coronavirus-vs-flu\/art-20490339)\n15. [COVID-19, cold, allergies and the flu: What are the differences?](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/covid-19-cold-flu-and-allergies-differences\/art-20503981)\n16. [COVID-19: How can I protect myself?](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/expert-answers\/novel-coronavirus\/faq-20478727)\n17. [COVID-19: Who's at higher risk of serious symptoms?](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/coronavirus-who-is-at-risk\/art-20483301)\n18. [Debunking COVID-19 myths](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/coronavirus-myths\/art-20485720)\n19. [Different types of COVID-19 vaccines: How they work](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/different-types-of-covid-19-vaccines\/art-20506465)\n20. [Fight coronavirus (COVID-19) transmission at home](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/coronavirus-transmission\/art-20482397)\n21. [Herd immunity and COVID-19: What you need to know](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/herd-immunity-and-coronavirus\/art-20486808)\n22. [How do COVID-19 antibody tests differ from diagnostic tests?](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/expert-answers\/covid-antibody-tests\/faq-20484429)\n23. [How well do face masks protect against COVID-19?](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/coronavirus-mask\/art-20485449)\n24. [Is hydroxychloroquine a treatment for COVID-19?](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/hydroxychloroquine-treatment-covid-19\/art-20555331)\n25. [Long COVID: Lasting effects of COVID-19](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/coronavirus-long-term-effects\/art-20490351)\n26. [Loss of taste and smell](https:\/\/www.mayoclinic.org\/healthy-lifestyle\/healthy-aging\/expert-answers\/loss-of-taste-and-smell\/faq-20058455)\n27. [Mayo Clinic Minute: How dirty are common surfaces?](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/multimedia\/how-dirty-are-common-surfaces\/vid-20483428)\n28. [Mayo Clinic Minute: You're washing your hands all wrong](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/multimedia\/youre-washing-your-hands-all-wrong\/vid-20483435)\n29. [Nasal polyps](https:\/\/www.mayoclinic.org\/diseases-conditions\/nasal-polyps\/symptoms-causes\/syc-20351888)\n30. [Pregnancy and COVID-19: What are the risks?](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/pregnancy-and-covid-19\/art-20482639)\n31. [Safe outdoor activities during the COVID-19 pandemic](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/safe-activities-during-covid19\/art-20489385)\n32. [Safety tips for attending school during COVID-19](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/returning-safely-to-school-covid-19\/art-20490441)\n33. [Sex and COVID-19](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/expert-answers\/sex-and-coronavirus\/faq-20486572)\n34. [Skull base tumors](https:\/\/www.mayoclinic.org\/diseases-conditions\/skull-base-tumors\/symptoms-causes\/syc-20581941)\n35. [Treating COVID-19 at home: Care tips for you and others](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/in-depth\/treating-covid-19-at-home\/art-20483273)\n36. [Unusual symptoms of coronavirus](https:\/\/www.mayoclinic.org\/diseases-conditions\/coronavirus\/expert-answers\/coronavirus-unusual-symptoms\/faq-20487367)\n\n.","meta_canonical":null,"ml_categories_json":"{\"\/Health\":999,\"\/Health\/Health_Conditions\":930,\"\/Health\/Health_Conditions\/Ear_Nose_and_Throat\":841}","ml_types_json":"{\"\/Article\":953,\"\/Article\/Definitions\":711}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1123113600,"attrs_is_republished":0,"attrs_nr_words":"1458","attrs_boilerpipe_nr_words":"738","body_ext_links_number":37,"body_int_links_number":133,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":591,"download_ttfb_msec":470,"download_size":57415}

3. Robots.txt Check

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Response:

4. Spam/Ban Check

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Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📄

INDEXABLE

✅

CRAWLED

22 days ago

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ROBOTS ALLOWED

Page Info Filters

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Spam/ban	PASS	`fh_dont_index != 1 AND ml_spam_score = 0`	ml_spam_score=0
Canonical	PASS	`meta_canonical IS NULL OR = '' OR = src_unparsed`	Not set

Page Details

Property

Value

URL

https://www.mayoclinic.org/symptoms/loss-of-smell/basics/causes/sym-20050804

Last Crawled

2026-04-01 05:03:14 (22 days ago)

First Indexed

2016-10-03 19:52:13 (9 years ago)

HTTP Status Code

200

Content

Meta Title

Loss of smell (anosmia) Causes - Mayo Clinic

Meta Description

A stuffy nose is one cause of this symptom. Learn about other causes and when it might be serious.

Meta Canonical

null

Boilerpipe Text

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null

Readable Markdown

A stuffy nose from a cold is a common cause for a partial, brief loss of smell. A polyp or swelling inside the nose can lead to a loss of smell. Aging can cause a loss of smell, especially after age 60. ### What is smell? The nose and an area in the upper throat have special cells, called receptors, that discern odors. These receptors send a message to the brain about each smell. The brain then figures out what the smell is. Any problem along the way can affect the sense of smell. Problems can include a stuffy nose; something that blocks the nose; swelling, called inflammation; nerve damage; or an issue with how the brain works. ### Problems with the inner lining of the nose Conditions that cause congestion or other issues inside the nose may include: 1. [Acute sinusitis](https://www.mayoclinic.org/diseases-conditions/acute-sinusitis/symptoms-causes/syc-20351671) 2. [Chronic sinusitis](https://www.mayoclinic.org/diseases-conditions/chronic-sinusitis/symptoms-causes/syc-20351661) 3. [Common cold](https://www.mayoclinic.org/diseases-conditions/common-cold/symptoms-causes/syc-20351605) 4. [Coronavirus disease 2019 (COVID-19)](https://www.mayoclinic.org/diseases-conditions/coronavirus/symptoms-causes/syc-20479963) 5. [Hay fever](https://www.mayoclinic.org/diseases-conditions/hay-fever/symptoms-causes/syc-20373039) 6. [Influenza (flu)](https://www.mayoclinic.org/diseases-conditions/flu/symptoms-causes/syc-20351719) 7. [Nonallergic rhinitis](https://www.mayoclinic.org/diseases-conditions/nonallergic-rhinitis/symptoms-causes/syc-20351229) 8. Smoking ### Blockages in the inside of the nose, called the nasal passages Conditions that block the flow of air through the nose can include: 1. [Nasal polyps](https://www.mayoclinic.org/diseases-conditions/nasal-polyps/symptoms-causes/syc-20351888) 2. Tumors ### Damage to your brain or nerves The following can cause damage to the nerves to the area of the brain that picks up smells or to the brain itself to: 1. Aging 2. [Alzheimer's disease](https://www.mayoclinic.org/diseases-conditions/alzheimers-disease/symptoms-causes/syc-20350447) 3. Being around toxic chemicals, such as those used in solvents 4. [Brain aneurysm](https://www.mayoclinic.org/diseases-conditions/brain-aneurysm/symptoms-causes/syc-20361483) 5. Brain surgery 6. [Brain tumor](https://www.mayoclinic.org/diseases-conditions/brain-tumor/symptoms-causes/syc-20350084) 7. [Diabetes](https://www.mayoclinic.org/diseases-conditions/diabetes/symptoms-causes/syc-20371444) 8. [Huntington's disease](https://www.mayoclinic.org/diseases-conditions/huntingtons-disease/symptoms-causes/syc-20356117) 9. [Hypothyroidism (underactive thyroid)](https://www.mayoclinic.org/diseases-conditions/hypothyroidism/symptoms-causes/syc-20350284) 10. Kallmann's syndrome (a rare genetic condition) 11. Korsakoff's psychosis, a brain condition caused by the lack of vitamin B-1, also called thiamin 12. [Lewy body dementia](https://www.mayoclinic.org/diseases-conditions/lewy-body-dementia/symptoms-causes/syc-20352025) 13. Medicines, such as some for high blood pressure, some antibiotics and antihistamines, and some nasal sprays 14. [Multiple sclerosis](https://www.mayoclinic.org/diseases-conditions/multiple-sclerosis/symptoms-causes/syc-20350269) 15. [Parkinson's disease](https://www.mayoclinic.org/diseases-conditions/parkinsons-disease/symptoms-causes/syc-20376055) 16. Poor nutrition, such as too little zinc or vitamin B-12 in the diet 17. [Pseudotumor cerebri (idiopathic intracranial hypertension)](https://www.mayoclinic.org/diseases-conditions/pseudotumor-cerebri/symptoms-causes/syc-20354031) 18. [Radiation therapy](https://www.mayoclinic.org/tests-procedures/radiation-therapy/about/pac-20385162) 19. [Rhinoplasty](https://www.mayoclinic.org/tests-procedures/rhinoplasty/about/pac-20384532) 20. [Traumatic brain injury](https://www.mayoclinic.org/diseases-conditions/traumatic-brain-injury/symptoms-causes/syc-20378557) Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis. ## From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. [Click here for an email preview.](https://links.e.response.mayoclinic.org/EmailPreview-GeneralHealth) Email We use the data you provide to deliver you the content you requested. To provide you with the most relevant and helpful information, we may combine your email and website data with other information we have about you. If you are a Mayo Clinic patient, we will only use your protected health information as outlined in our [Notice of Privacy Practices](https://mcforms.mayo.edu/mc5200-mc5299/mc5256-01.pdf). You may opt out of email communications at any time by clicking on the unsubscribe link in the email. - [Share](https://www.facebook.com/sharer.php?u=https://www.mayoclinic.org/symptoms/loss-of-smell/basics/causes/sym-20050804) - [Tweet](http://twitter.com/intent/tweet?url=https://www.mayoclinic.org/symptoms/loss-of-smell/basics/causes/sym-20050804&text=Loss+of+smell+\(anosmia\)+Causes) Dec. 24, 2025 1. Ferri FF. T-differential diagnosis. In: Ferri's Clinical Advisor 2023. Elsevier; 2023. https://www.clinicalkey.com. Accessed April 6, 2023. 2. Smell disorders. National Institute on Deafness and Other Communication Disorders. https://www.nidcd.nih.gov/health/smell-disorders. Accessed April 6, 2023. 3. Lalwani AK. Olfactory dysfunction. In: Current Diagnosis & Treatment in Otolaryngology — Head & Neck Surgery. 4th ed. McGraw Hill; 2020. https://accessmedicine.mhmedical.com. Accessed April 6, 2023. 4. Lafreniere D. Taste and olfactory disorders in adults: Anatomy and etiology. https://www.uptodate.com/contents/search. Accessed April 7, 2023. 5. Anosmia. Merck Manual Professional Version. https://www.merckmanuals.com/professional/ear,-nose,-and-throat-disorders/approach-to-the-patient-with-nasal-and-pharyngeal-symptoms/anosmia. Accessed April 6, 2023. ## See also 1. [Bardet-Biedl syndrome (BBS)](https://www.mayoclinic.org/diseases-conditions/bardet-biedl-syndrome/symptoms-causes/syc-20586227) 2. [Chronic sinusitis](https://www.mayoclinic.org/diseases-conditions/chronic-sinusitis/symptoms-causes/syc-20351661) 3. [Coronavirus disease 2019 (COVID-19)](https://www.mayoclinic.org/diseases-conditions/coronavirus/symptoms-causes/syc-20479963) 4. [Coronavirus infection by race](https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/coronavirus-infection-by-race/faq-20488802) 5. [COVID-19 and pets](https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/can-pets-get-coronavirus/faq-20486391) 6. [COVID-19 and vitamin D](https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/coronavirus-and-vitamin-d/faq-20493088) 7. [COVID-19 and your mental health](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/mental-health-covid-19/art-20482731) 8. [COVID-19 drugs: Are there any that work?](https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/coronavirus-drugs/faq-20485627) 9. [COVID-19 in babies and children](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-in-babies-and-children/art-20484405) 10. [COVID-19 travel advice](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-safe-travel-advice/art-20486965) 11. [COVID-19 vaccines for kids: What you need to know](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/covid-19-vaccines-for-kids/art-20513332) 12. [COVID-19 vaccines: Get the facts](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-vaccine/art-20484859) 13. [COVID-19 variants](https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/covid-variant/faq-20505779) 14. [COVID-19 vs. flu: Similarities and differences](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-vs-flu/art-20490339) 15. [COVID-19, cold, allergies and the flu: What are the differences?](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/covid-19-cold-flu-and-allergies-differences/art-20503981) 16. [COVID-19: How can I protect myself?](https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/novel-coronavirus/faq-20478727) 17. [COVID-19: Who's at higher risk of serious symptoms?](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-who-is-at-risk/art-20483301) 18. [Debunking COVID-19 myths](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-myths/art-20485720) 19. [Different types of COVID-19 vaccines: How they work](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/different-types-of-covid-19-vaccines/art-20506465) 20. [Fight coronavirus (COVID-19) transmission at home](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-transmission/art-20482397) 21. [Herd immunity and COVID-19: What you need to know](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/herd-immunity-and-coronavirus/art-20486808) 22. [How do COVID-19 antibody tests differ from diagnostic tests?](https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/covid-antibody-tests/faq-20484429) 23. [How well do face masks protect against COVID-19?](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-mask/art-20485449) 24. [Is hydroxychloroquine a treatment for COVID-19?](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/hydroxychloroquine-treatment-covid-19/art-20555331) 25. [Long COVID: Lasting effects of COVID-19](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-long-term-effects/art-20490351) 26. [Loss of taste and smell](https://www.mayoclinic.org/healthy-lifestyle/healthy-aging/expert-answers/loss-of-taste-and-smell/faq-20058455) 27. [Mayo Clinic Minute: How dirty are common surfaces?](https://www.mayoclinic.org/diseases-conditions/coronavirus/multimedia/how-dirty-are-common-surfaces/vid-20483428) 28. [Mayo Clinic Minute: You're washing your hands all wrong](https://www.mayoclinic.org/diseases-conditions/coronavirus/multimedia/youre-washing-your-hands-all-wrong/vid-20483435) 29. [Nasal polyps](https://www.mayoclinic.org/diseases-conditions/nasal-polyps/symptoms-causes/syc-20351888) 30. [Pregnancy and COVID-19: What are the risks?](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/pregnancy-and-covid-19/art-20482639) 31. [Safe outdoor activities during the COVID-19 pandemic](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/safe-activities-during-covid19/art-20489385) 32. [Safety tips for attending school during COVID-19](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/returning-safely-to-school-covid-19/art-20490441) 33. [Sex and COVID-19](https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/sex-and-coronavirus/faq-20486572) 34. [Skull base tumors](https://www.mayoclinic.org/diseases-conditions/skull-base-tumors/symptoms-causes/syc-20581941) 35. [Treating COVID-19 at home: Care tips for you and others](https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/treating-covid-19-at-home/art-20483273) 36. [Unusual symptoms of coronavirus](https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/coronavirus-unusual-symptoms/faq-20487367) .

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