🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 147 (from laksa191)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa147.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.cedars-sinai.org/health-library/diseases-and-conditions/c/chronic-fatigue-syndrome.html\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.cedars-sinai.org/health-library/diseases-and-conditions/c/chronic-fatigue-syndrome.html\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.cedars-sinai.org\/health-library\/diseases-and-conditions\/c\/chronic-fatigue-syndrome.html","crawl_time":1776806109,"first_indexed_time":1531556946,"http_code":200,"src_unparsed":"org,cedars-sinai!www,\/health-library\/diseases-and-conditions\/c\/chronic-fatigue-syndrome.html s443","src_root_hash":"18124545878044281147","history_drop_reason":null,"meta_title":"Chronic Fatigue Syndrome (CFS) | Cedars-Sinai","meta_descriptions":["Learn details about chronic fatigue syndrome (CFS), a debilitating condition marked by profound tiredness, regardless of bed rest."],"attrs_boilerpipe_text":"Chronic Fatigue Syndrome (CFS)\nNot what you're looking for?\nWhat is chronic fatigue syndrome?\nChronic fatigue syndrome (CFS) is a condition marked by profound tiredness, regardless\n               of sleep. It's also called myalgic encephalomyelitis (ME). Symptoms often get worse\n               with\n               minimal physical or mental activity. CFS can happen suddenly and last for years. Females\n               are more affected than males.\nWhat causes chronic fatigue syndrome?\nThe\n               cause of CFS isn't known. It may be from a viral infection in some people. But the\n               exact\n               cause is almost always unclear. Other possible causes being studied are genetics and\n               immune system problems.\nWho is at risk for chronic fatigue syndrome?\nBecause the cause of CFS isn't known, it’s hard to know what might put someone at\n               risk\n               for getting the condition. But certain factors are seen more often in people with\n               CFS.\n               These include:\nBeing\n                     female.\nCFS happens up to 2 to 4 times more often in women than in men.\nAge.\nCFS\n                  often affects middle-aged people. But people of any age can get it.\nWhat are the symptoms of chronic fatigue syndrome?\nSymptoms of CFS are often nonspecific and can be seen with viruses or depression.\n               Symptoms of long COVID are often compared to CFS. Symptoms may be a bit different\n               for\n               each person. The most common symptoms are:\nSensitivity to light.\nHeadache.\nTender\n                  lymph nodes.\nFatigue\n                  and weakness.\nMuscle\n                  and joint pain.\nInability to focus.\nFeelings of exhaustion after putting out physical or mental\n                  energy.\nInsomnia.\nForgetfulness.\nMood\n                  swings.\nConfusion.\nLow-grade fever.\nDepression.\nMany of these symptoms may be caused by other health problems. Always\n               talk with your health care provider for a diagnosis.\nHow is chronic fatigue syndrome\n            diagnosed?\nA\n               CFS diagnosis must rule out other possible conditions. According to the Institute\n               of\n               Medicine, a CFS diagnosis requires all three of these symptoms:\nHaving to cut\n                     back greatly on the activities you did before the illness.\nSevere and chronic\n                  tiredness must have lasted for more than 6 months, and other health conditions have\n                  been ruled out. Rest does not ease these symptoms.\nSevere\n                     tiredness after physical activity.\nThe fatigue gets worse after physical or\n                  mental stress that you could handle before the illness started.\nSleep that doesn't refresh you.\nIn\n               addition, you must have one of these symptoms:\nTrouble thinking\nthat gets\n                  worse under pressure.\nOrthostatic intolerance.\nThis means standing upright makes symptoms worse. Lying back down or raising\n                  (elevating) your feet may ease the symptoms. But it doesn't fully get rid of\n                  them.\nHow is chronic fatigue syndrome treated?\nThere is no known cure for CFS. Treatment is aimed at easing symptoms.\nTreatment may include:\nMedicine, including corticosteroids and antidepressants.\nActivity management, including a careful balancing of rest and\n                  activity to prevent flare-ups.\nLight-intensity aerobic exercise, but not moderate to vigorously intense physical\n                  activity. \nDietary\n                  supplements and herbal products.\nPsychotherapy and supportive counseling.\nLiving with chronic fatigue syndrome\nThere is no known cure for CFS at this time. Dealing with the severe fatigue can be\n               very challenging. It's important to work with your health care provider to find\n               treatments that help you. Some people find counseling or support groups helpful.\nWhen should I call my\n            doctor?\nContact your health care provider if your symptoms get worse or you have new\n               symptoms.\nKey points about chronic fatigue syndrome\nChronic\n                  fatigue syndrome is marked by profound tiredness.\nSymptoms often get worse with physical or mental activity.\nIn\n                  addition to severe tiredness, symptoms include light sensitivity, headache, muscle\n                  and joint pain, trouble concentrating, mood swings, and depression.\nTreatments may include medicines, exercise, supplements, and counseling.\nNext steps\nHere are some tips to help you get the\n               most from a visit to your health care provider:\nKnow the reason for your visit and what you want to happen.\nBefore your visit, write down questions you want answered.\nBring someone with you to help you ask questions and remember what your provider tells\n                  you.\nAt the\n                  visit, write down the name of a new diagnosis, and any new medicines, treatments,\n                  or\n                  tests. Also, write down any new instructions your provider gives you.\nKnow\n                  why a new medicine or treatment is prescribed and how it will help you. Also know\n                  what the side effects are and when they should be reported.\nAsk if your condition can be treated in other ways.\nKnow\n                  why a test or procedure is advised and what the results could mean.\nKnow\n                  what to expect if you don't take the medicine or have the test or procedure.\nIf you have a follow-up appointment, write down the date, time, and purpose for that\n                  visit.\nKnow how\n                  you can contact your health care provider if you have questions, especially after\n                  office hours and on weekends.\nMedical Reviewer:\nSravani Chintapalli\nMedical Reviewer:\nSabrina Felson MD\nMedical Reviewer:\nRita Sather RN\n© 2000-2025 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. 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[DIAGNOSIS](https:\/\/www.cedars-sinai.org\/health-library\/diseases-and-conditions\/c\/chronic-fatigue-syndrome.html#how-diagnosed) [TREATMENT](https:\/\/www.cedars-sinai.org\/health-library\/diseases-and-conditions\/c\/chronic-fatigue-syndrome.html#treatment) [NEXT STEPS](https:\/\/www.cedars-sinai.org\/health-library\/diseases-and-conditions\/c\/chronic-fatigue-syndrome.html#action-alert)\n\n## What is chronic fatigue syndrome?\nChronic fatigue syndrome (CFS) is a condition marked by profound tiredness, regardless of sleep. It's also called myalgic encephalomyelitis (ME). Symptoms often get worse with minimal physical or mental activity. CFS can happen suddenly and last for years. Females are more affected than males.\n\n## What causes chronic fatigue syndrome?\nThe cause of CFS isn't known. It may be from a viral infection in some people. But the exact cause is almost always unclear. Other possible causes being studied are genetics and immune system problems.\n\n## Who is at risk for chronic fatigue syndrome?\nBecause the cause of CFS isn't known, it’s hard to know what might put someone at risk for getting the condition. But certain factors are seen more often in people with CFS. These include:\n\n- **Being female.**  CFS happens up to 2 to 4 times more often in women than in men.\n- **Age.** CFS often affects middle-aged people. But people of any age can get it.\n\n## What are the symptoms of chronic fatigue syndrome?\nSymptoms of CFS are often nonspecific and can be seen with viruses or depression. Symptoms of long COVID are often compared to CFS. Symptoms may be a bit different for each person. The most common symptoms are:\n\n- Sensitivity to light.\n- Headache.\n- Tender lymph nodes.\n- Fatigue and weakness.\n- Muscle and joint pain.\n- Inability to focus.\n- Feelings of exhaustion after putting out physical or mental energy.\n- Insomnia.\n- Forgetfulness.\n- Mood swings.\n- Confusion.\n- Low-grade fever.\n- Depression.\n\nMany of these symptoms may be caused by other health problems. Always talk with your health care provider for a diagnosis.\n\n## How is chronic fatigue syndrome diagnosed?\nA CFS diagnosis must rule out other possible conditions. According to the Institute of Medicine, a CFS diagnosis requires all three of these symptoms:\n\n- **Having to cut back greatly on the activities you did before the illness.** Severe and chronic tiredness must have lasted for more than 6 months, and other health conditions have been ruled out. Rest does not ease these symptoms.\n- **Severe tiredness after physical activity.**  The fatigue gets worse after physical or mental stress that you could handle before the illness started.\n- **Sleep that doesn't refresh you.**\n\nIn addition, you must have one of these symptoms:\n\n- **Trouble thinking** that gets worse under pressure.\n- **Orthostatic intolerance.** This means standing upright makes symptoms worse. Lying back down or raising (elevating) your feet may ease the symptoms. But it doesn't fully get rid of them.\n\n## How is chronic fatigue syndrome treated?\nThere is no known cure for CFS. Treatment is aimed at easing symptoms.\n\nTreatment may include:\n\n- Medicine, including corticosteroids and antidepressants.\n- Activity management, including a careful balancing of rest and activity to prevent flare-ups.\n- Light-intensity aerobic exercise, but not moderate to vigorously intense physical activity.\n- Dietary supplements and herbal products.\n- Psychotherapy and supportive counseling.\n\n## Living with chronic fatigue syndrome\nThere is no known cure for CFS at this time. Dealing with the severe fatigue can be very challenging. It's important to work with your health care provider to find treatments that help you. Some people find counseling or support groups helpful.\n\n## When should I call my doctor?\nContact your health care provider if your symptoms get worse or you have new symptoms.\n\n## Key points about chronic fatigue syndrome\n- Chronic fatigue syndrome is marked by profound tiredness.\n- Symptoms often get worse with physical or mental activity.\n- In addition to severe tiredness, symptoms include light sensitivity, headache, muscle and joint pain, trouble concentrating, mood swings, and depression.\n- Treatments may include medicines, exercise, supplements, and counseling.\n\n## Next steps\nHere are some tips to help you get the most from a visit to your health care provider:\n\n- Know the reason for your visit and what you want to happen.\n- Before your visit, write down questions you want answered.\n- Bring someone with you to help you ask questions and remember what your provider tells you.\n- At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also, write down any new instructions your provider gives you.\n- Know why a new medicine or treatment is prescribed and how it will help you. Also know what the side effects are and when they should be reported.\n- Ask if your condition can be treated in other ways.\n- Know why a test or procedure is advised and what the results could mean.\n- Know what to expect if you don't take the medicine or have the test or procedure.\n- If you have a follow-up appointment, write down the date, time, and purpose for that visit.\n- Know how you can contact your health care provider if you have questions, especially after office hours and on weekends.\n\nMedical Reviewer: Sravani Chintapalli\n\nMedical Reviewer: Sabrina Felson MD\n\nMedical Reviewer: Rita Sather RN\n\n© 2000-2025 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.\n\nNot what you're looking for?\n\n[Start New Search](https:\/\/www.cedars-sinai.org\/health-library.html)\n\nLooking for a Physician?\n\nChoose a doctor and schedule an appointment.\n\n[Find a Doctor](https:\/\/www.cedars-sinai.org\/find-a-doctor.html)\n\n[Looking for Virtual Care?](https:\/\/csconnect.cedars-sinai.org\/?utm_source=cs_website&utm_medium=web&utm_campaign_name=web_homepage&utm_content=cs_connect_launch)\n\nConnect with providers for illnesses like flus, UTIs and rashes (ages 3+) or chronic conditions like asthma, weight management and diabetes (ages 18+).\n\n[Get Care Now](https:\/\/csconnect.cedars-sinai.org\/app?utm_source=cs_website&utm_medium=web&utm_campaign_name=web_health_library&utm_content=banner \"Get Care Now\")\n\nWant More Information?\n\nCedars-Sinai has a range of comprehensive treatment options.\n\n[See Our Programs](https:\/\/www.cedars-sinai.org\/programs.html)\n\n### Need Help?\n[1-800-CEDARS-1](tel:1-800-233-2771)\n\n(1-800-233-2771)\n\nMonday‑Friday, 8 am‑5 pm PT\n\n[Schedule a Callback](https:\/\/cedarssinai.my.salesforce-sites.com\/ClickToCall)\n\n###### Expert Care for Life™ Starts Here\n[Adult Primary Care](https:\/\/www.cedars-sinai.org\/programs\/primary-care.html)\n\n[Pediatric Primary Care](https:\/\/www.cedars-sinai.org\/programs\/pediatrics\/specialties\/primary-care.html)\n\n[Urgent Care](https:\/\/www.cedars-sinai.org\/programs\/urgent-care.html)\n\n###### Need Help?\n[1-800-CEDARS-1](tel:1-800-233-2771)\n\n(1-800-233-2771)\n\n[Schedule a Callback](https:\/\/cedarssinai.my.salesforce-sites.com\/ClickToCall)\n\n###### Looking for a Physician\nChoose a doctor and schedule an appointment.\n\n[Find a Doctor](https:\/\/www.cedars-sinai.org\/find-a-doctor.html)\n\n[Cedars-Sinai](https:\/\/www.cedars-sinai.org\/)\n\n[Health Library](https:\/\/www.cedars-sinai.org\/health-library.html)   Chronic Fatigue Syndrome (CFS)\n\nContribute\n\n- [Giving](http:\/\/www.cedars-sinai.org\/giving.html)\n- [Give Now](https:\/\/support.cedars-sinai.edu\/give\/170230\/#!\/donation\/checkout)\n- [Volunteer](http:\/\/www.cedars-sinai.org\/volunteer-services.html)\n- [Patient & Family Advisors](http:\/\/www.cedars-sinai.org\/patient-and-family-advisors.html)\n\nLearn More\n\n- [About Us](http:\/\/www.cedars-sinai.org\/about.html)\n- [Visiting Cedars-Sinai Medical Center](http:\/\/www.cedars-sinai.org\/locations\/cedars-sinai-main-campus-89\/visiting-a-patient.html)\n- [Quality Measures](http:\/\/www.cedars-sinai.org\/quality-measures.html)\n- [Diversity & Inclusion](http:\/\/www.cedars-sinai.org\/diversity-and-inclusion.html)\n- [Health Equity](http:\/\/www.cedars-sinai.org\/health-equity.html)\n- [Supply Chain](http:\/\/www.cedars-sinai.org\/supply-chain.html)\n- [Community Health](http:\/\/www.cedars-sinai.org\/community.html)\n\nFor Professionals\n\n- [Resources](http:\/\/www.cedars-sinai.org\/med-pros.html)\n- [Nursing](http:\/\/www.cedars-sinai.org\/med-pros\/nursing.html)\n- [Staff Login](http:\/\/www.cedars-sinai.org\/staff.html)\n- [Practitioner Primary Source Verification](https:\/\/onlinecredentialing.csmc.edu\/psv\/)\n\nConnect\n\n- [Contact Us](http:\/\/www.cedars-sinai.org\/contact.html)\n- [Newsroom](https:\/\/www.cedars-sinai.org\/newsroom)\n- [Stories & Insights](https:\/\/www.cedars-sinai.org\/stories-and-insights)\n- [Events](http:\/\/www.cedars-sinai.org\/events.html)\n\nInternational\n\n- [International Patients](http:\/\/www.cedars-sinai.org\/international-patients.html)\n- [Global Collaborations](http:\/\/www.cedars-sinai.org\/global-collaborations.html)\n\nPatient Tools\n\n- [Symptom Checker](http:\/\/www.cedars-sinai.org\/health-library\/symptom-checker.html)\n- [Conditions Library](http:\/\/www.cedars-sinai.org\/health-library.html)\n- [Patient Rights](http:\/\/www.cedars-sinai.org\/programs\/support-services\/patient-rights.html)\n- [Help Paying Your Bill](http:\/\/www.cedars-sinai.org\/billing-insurance-records\/help-paying-your-bill.html)\n\nJoin Our Team\n\n- [Careers](https:\/\/careers.cshs.org\/)\n\n[call us 1-800-CEDARS-1](tel:18002332771)\n\nFollow Us\n\n- [Join us on Facebook](https:\/\/www.facebook.com\/CedarsSinai \"Facebook\")\n- [Watch us on YouTube](https:\/\/www.youtube.com\/user\/CEDARSSINAI \"YouTube\")\n- [Follow us on Instagram](https:\/\/www.instagram.com\/cedarssinai\/ \"Instagram\")\n- [Connect with us on LinkedIn](https:\/\/www.linkedin.com\/company\/cedars-sinai-medical-center\/mycompany\/ \"LinkedIn\")\n\nget our app\n\n[![Get it on Google Play](https:\/\/www.cedars-sinai.org\/etc\/designs\/cedars-sinai\/clientlib\/fed-build\/images\/google-play.png)](https:\/\/play.google.com\/store\/apps\/details?id=com.cedars_sinai.mycslink&hl=en)   [![Download on the App Store](https:\/\/www.cedars-sinai.org\/etc\/designs\/cedars-sinai\/clientlib\/fed-build\/images\/app-store.svg)](https:\/\/apps.apple.com\/us\/app\/cedars-sinai-my-cs-link\/id1034088603)\n\n© 2026 Cedars-Sinai. All rights reserved. A 501(c)(3) nonprofit organization.\n\n- [Patient Rights](http:\/\/www.cedars-sinai.org\/programs\/support-services\/patient-rights.html)\n- [Terms and Conditions](http:\/\/www.cedars-sinai.org\/terms-conditions.html)\n- [Privacy Policy](http:\/\/www.cedars-sinai.org\/privacy-policy.html)\n- [Nondiscrimination](http:\/\/www.cedars-sinai.org\/nondiscrimination.html)\n- [Accessibility Statement](http:\/\/www.cedars-sinai.org\/accessibility-statement.html)\n- [Price Transparency](http:\/\/www.cedars-sinai.org\/price-transparency.html)\n- [Sitemap](http:\/\/www.cedars-sinai.org\/sitemap.html)","attrs_readable_markdown":"## Chronic Fatigue Syndrome (CFS)\nNot what you're looking for?\n\n## What is chronic fatigue syndrome?\nChronic fatigue syndrome (CFS) is a condition marked by profound tiredness, regardless of sleep. It's also called myalgic encephalomyelitis (ME). Symptoms often get worse with minimal physical or mental activity. CFS can happen suddenly and last for years. Females are more affected than males.\n\n## What causes chronic fatigue syndrome?\nThe cause of CFS isn't known. It may be from a viral infection in some people. But the exact cause is almost always unclear. Other possible causes being studied are genetics and immune system problems.\n\n## Who is at risk for chronic fatigue syndrome?\nBecause the cause of CFS isn't known, it’s hard to know what might put someone at risk for getting the condition. But certain factors are seen more often in people with CFS. These include:\n\n- **Being female.**  CFS happens up to 2 to 4 times more often in women than in men.\n- **Age.** CFS often affects middle-aged people. But people of any age can get it.\n\n## What are the symptoms of chronic fatigue syndrome?\nSymptoms of CFS are often nonspecific and can be seen with viruses or depression. Symptoms of long COVID are often compared to CFS. Symptoms may be a bit different for each person. The most common symptoms are:\n\n- Sensitivity to light.\n- Headache.\n- Tender lymph nodes.\n- Fatigue and weakness.\n- Muscle and joint pain.\n- Inability to focus.\n- Feelings of exhaustion after putting out physical or mental energy.\n- Insomnia.\n- Forgetfulness.\n- Mood swings.\n- Confusion.\n- Low-grade fever.\n- Depression.\n\nMany of these symptoms may be caused by other health problems. Always talk with your health care provider for a diagnosis.\n\n## How is chronic fatigue syndrome diagnosed?\nA CFS diagnosis must rule out other possible conditions. According to the Institute of Medicine, a CFS diagnosis requires all three of these symptoms:\n\n- **Having to cut back greatly on the activities you did before the illness.** Severe and chronic tiredness must have lasted for more than 6 months, and other health conditions have been ruled out. Rest does not ease these symptoms.\n- **Severe tiredness after physical activity.**  The fatigue gets worse after physical or mental stress that you could handle before the illness started.\n- **Sleep that doesn't refresh you.**\n\nIn addition, you must have one of these symptoms:\n\n- **Trouble thinking** that gets worse under pressure.\n- **Orthostatic intolerance.** This means standing upright makes symptoms worse. Lying back down or raising (elevating) your feet may ease the symptoms. But it doesn't fully get rid of them.\n\n## How is chronic fatigue syndrome treated?\nThere is no known cure for CFS. Treatment is aimed at easing symptoms.\n\nTreatment may include:\n\n- Medicine, including corticosteroids and antidepressants.\n- Activity management, including a careful balancing of rest and activity to prevent flare-ups.\n- Light-intensity aerobic exercise, but not moderate to vigorously intense physical activity.\n- Dietary supplements and herbal products.\n- Psychotherapy and supportive counseling.\n\n## Living with chronic fatigue syndrome\nThere is no known cure for CFS at this time. Dealing with the severe fatigue can be very challenging. It's important to work with your health care provider to find treatments that help you. Some people find counseling or support groups helpful.\n\n## When should I call my doctor?\nContact your health care provider if your symptoms get worse or you have new symptoms.\n\n## Key points about chronic fatigue syndrome\n- Chronic fatigue syndrome is marked by profound tiredness.\n- Symptoms often get worse with physical or mental activity.\n- In addition to severe tiredness, symptoms include light sensitivity, headache, muscle and joint pain, trouble concentrating, mood swings, and depression.\n- Treatments may include medicines, exercise, supplements, and counseling.\n\n## Next steps\nHere are some tips to help you get the most from a visit to your health care provider:\n\n- Know the reason for your visit and what you want to happen.\n- Before your visit, write down questions you want answered.\n- Bring someone with you to help you ask questions and remember what your provider tells you.\n- At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also, write down any new instructions your provider gives you.\n- Know why a new medicine or treatment is prescribed and how it will help you. Also know what the side effects are and when they should be reported.\n- Ask if your condition can be treated in other ways.\n- Know why a test or procedure is advised and what the results could mean.\n- Know what to expect if you don't take the medicine or have the test or procedure.\n- If you have a follow-up appointment, write down the date, time, and purpose for that visit.\n- Know how you can contact your health care provider if you have questions, especially after office hours and on weekends.\n\nMedical Reviewer: Sravani Chintapalli\n\nMedical Reviewer: Sabrina Felson MD\n\nMedical Reviewer: Rita Sather RN\n\n© 2000-2025 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. 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Chronic Fatigue Syndrome (CFS) | Cedars-Sinai

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Learn details about chronic fatigue syndrome (CFS), a debilitating condition marked by profound tiredness, regardless of bed rest.

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Chronic Fatigue Syndrome (CFS) Not what you're looking for? What is chronic fatigue syndrome? Chronic fatigue syndrome (CFS) is a condition marked by profound tiredness, regardless of sleep. It's also called myalgic encephalomyelitis (ME). Symptoms often get worse with minimal physical or mental activity. CFS can happen suddenly and last for years. Females are more affected than males. What causes chronic fatigue syndrome? The cause of CFS isn't known. It may be from a viral infection in some people. But the exact cause is almost always unclear. Other possible causes being studied are genetics and immune system problems. Who is at risk for chronic fatigue syndrome? Because the cause of CFS isn't known, it’s hard to know what might put someone at risk for getting the condition. But certain factors are seen more often in people with CFS. These include: Being female. CFS happens up to 2 to 4 times more often in women than in men. Age. CFS often affects middle-aged people. But people of any age can get it. What are the symptoms of chronic fatigue syndrome? Symptoms of CFS are often nonspecific and can be seen with viruses or depression. Symptoms of long COVID are often compared to CFS. Symptoms may be a bit different for each person. The most common symptoms are: Sensitivity to light. Headache. Tender lymph nodes. Fatigue and weakness. Muscle and joint pain. Inability to focus. Feelings of exhaustion after putting out physical or mental energy. Insomnia. Forgetfulness. Mood swings. Confusion. Low-grade fever. Depression. Many of these symptoms may be caused by other health problems. Always talk with your health care provider for a diagnosis. How is chronic fatigue syndrome diagnosed? A CFS diagnosis must rule out other possible conditions. According to the Institute of Medicine, a CFS diagnosis requires all three of these symptoms: Having to cut back greatly on the activities you did before the illness. Severe and chronic tiredness must have lasted for more than 6 months, and other health conditions have been ruled out. Rest does not ease these symptoms. Severe tiredness after physical activity. The fatigue gets worse after physical or mental stress that you could handle before the illness started. Sleep that doesn't refresh you. In addition, you must have one of these symptoms: Trouble thinking that gets worse under pressure. Orthostatic intolerance. This means standing upright makes symptoms worse. Lying back down or raising (elevating) your feet may ease the symptoms. But it doesn't fully get rid of them. How is chronic fatigue syndrome treated? There is no known cure for CFS. Treatment is aimed at easing symptoms. Treatment may include: Medicine, including corticosteroids and antidepressants. Activity management, including a careful balancing of rest and activity to prevent flare-ups. Light-intensity aerobic exercise, but not moderate to vigorously intense physical activity. Dietary supplements and herbal products. Psychotherapy and supportive counseling. Living with chronic fatigue syndrome There is no known cure for CFS at this time. Dealing with the severe fatigue can be very challenging. It's important to work with your health care provider to find treatments that help you. Some people find counseling or support groups helpful. When should I call my doctor? Contact your health care provider if your symptoms get worse or you have new symptoms. Key points about chronic fatigue syndrome Chronic fatigue syndrome is marked by profound tiredness. Symptoms often get worse with physical or mental activity. In addition to severe tiredness, symptoms include light sensitivity, headache, muscle and joint pain, trouble concentrating, mood swings, and depression. Treatments may include medicines, exercise, supplements, and counseling. Next steps Here are some tips to help you get the most from a visit to your health care provider: Know the reason for your visit and what you want to happen. Before your visit, write down questions you want answered. Bring someone with you to help you ask questions and remember what your provider tells you. At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also, write down any new instructions your provider gives you. Know why a new medicine or treatment is prescribed and how it will help you. Also know what the side effects are and when they should be reported. Ask if your condition can be treated in other ways. Know why a test or procedure is advised and what the results could mean. Know what to expect if you don't take the medicine or have the test or procedure. If you have a follow-up appointment, write down the date, time, and purpose for that visit. Know how you can contact your health care provider if you have questions, especially after office hours and on weekends. Medical Reviewer: Sravani Chintapalli Medical Reviewer: Sabrina Felson MD Medical Reviewer: Rita Sather RN © 2000-2025 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions. Not what you're looking for?

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[Start New Search](https://www.cedars-sinai.org/health-library.html) [ABOUT](https://www.cedars-sinai.org/health-library/diseases-and-conditions/c/chronic-fatigue-syndrome.html#what-is-disease) [CAUSES](https://www.cedars-sinai.org/health-library/diseases-and-conditions/c/chronic-fatigue-syndrome.html#causes) [DIAGNOSIS](https://www.cedars-sinai.org/health-library/diseases-and-conditions/c/chronic-fatigue-syndrome.html#how-diagnosed) [TREATMENT](https://www.cedars-sinai.org/health-library/diseases-and-conditions/c/chronic-fatigue-syndrome.html#treatment) [NEXT STEPS](https://www.cedars-sinai.org/health-library/diseases-and-conditions/c/chronic-fatigue-syndrome.html#action-alert) ## What is chronic fatigue syndrome? Chronic fatigue syndrome (CFS) is a condition marked by profound tiredness, regardless of sleep. It's also called myalgic encephalomyelitis (ME). Symptoms often get worse with minimal physical or mental activity. CFS can happen suddenly and last for years. Females are more affected than males. ## What causes chronic fatigue syndrome? The cause of CFS isn't known. It may be from a viral infection in some people. But the exact cause is almost always unclear. Other possible causes being studied are genetics and immune system problems. ## Who is at risk for chronic fatigue syndrome? Because the cause of CFS isn't known, it’s hard to know what might put someone at risk for getting the condition. But certain factors are seen more often in people with CFS. These include: - **Being female.** CFS happens up to 2 to 4 times more often in women than in men. - **Age.** CFS often affects middle-aged people. But people of any age can get it. ## What are the symptoms of chronic fatigue syndrome? Symptoms of CFS are often nonspecific and can be seen with viruses or depression. Symptoms of long COVID are often compared to CFS. Symptoms may be a bit different for each person. The most common symptoms are: - Sensitivity to light. - Headache. - Tender lymph nodes. - Fatigue and weakness. - Muscle and joint pain. - Inability to focus. - Feelings of exhaustion after putting out physical or mental energy. - Insomnia. - Forgetfulness. - Mood swings. - Confusion. - Low-grade fever. - Depression. Many of these symptoms may be caused by other health problems. Always talk with your health care provider for a diagnosis. ## How is chronic fatigue syndrome diagnosed? A CFS diagnosis must rule out other possible conditions. According to the Institute of Medicine, a CFS diagnosis requires all three of these symptoms: - **Having to cut back greatly on the activities you did before the illness.** Severe and chronic tiredness must have lasted for more than 6 months, and other health conditions have been ruled out. Rest does not ease these symptoms. - **Severe tiredness after physical activity.** The fatigue gets worse after physical or mental stress that you could handle before the illness started. - **Sleep that doesn't refresh you.** In addition, you must have one of these symptoms: - **Trouble thinking** that gets worse under pressure. - **Orthostatic intolerance.** This means standing upright makes symptoms worse. Lying back down or raising (elevating) your feet may ease the symptoms. But it doesn't fully get rid of them. ## How is chronic fatigue syndrome treated? There is no known cure for CFS. Treatment is aimed at easing symptoms. Treatment may include: - Medicine, including corticosteroids and antidepressants. - Activity management, including a careful balancing of rest and activity to prevent flare-ups. - Light-intensity aerobic exercise, but not moderate to vigorously intense physical activity. - Dietary supplements and herbal products. - Psychotherapy and supportive counseling. ## Living with chronic fatigue syndrome There is no known cure for CFS at this time. Dealing with the severe fatigue can be very challenging. It's important to work with your health care provider to find treatments that help you. Some people find counseling or support groups helpful. ## When should I call my doctor? Contact your health care provider if your symptoms get worse or you have new symptoms. ## Key points about chronic fatigue syndrome - Chronic fatigue syndrome is marked by profound tiredness. - Symptoms often get worse with physical or mental activity. - In addition to severe tiredness, symptoms include light sensitivity, headache, muscle and joint pain, trouble concentrating, mood swings, and depression. - Treatments may include medicines, exercise, supplements, and counseling. ## Next steps Here are some tips to help you get the most from a visit to your health care provider: - Know the reason for your visit and what you want to happen. - Before your visit, write down questions you want answered. - Bring someone with you to help you ask questions and remember what your provider tells you. - At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also, write down any new instructions your provider gives you. - Know why a new medicine or treatment is prescribed and how it will help you. Also know what the side effects are and when they should be reported. - Ask if your condition can be treated in other ways. - Know why a test or procedure is advised and what the results could mean. - Know what to expect if you don't take the medicine or have the test or procedure. - If you have a follow-up appointment, write down the date, time, and purpose for that visit. - Know how you can contact your health care provider if you have questions, especially after office hours and on weekends. Medical Reviewer: Sravani Chintapalli Medical Reviewer: Sabrina Felson MD Medical Reviewer: Rita Sather RN © 2000-2025 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions. Not what you're looking for? 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Readable Markdown

## Chronic Fatigue Syndrome (CFS) Not what you're looking for? ## What is chronic fatigue syndrome? Chronic fatigue syndrome (CFS) is a condition marked by profound tiredness, regardless of sleep. It's also called myalgic encephalomyelitis (ME). Symptoms often get worse with minimal physical or mental activity. CFS can happen suddenly and last for years. Females are more affected than males. ## What causes chronic fatigue syndrome? The cause of CFS isn't known. It may be from a viral infection in some people. But the exact cause is almost always unclear. Other possible causes being studied are genetics and immune system problems. ## Who is at risk for chronic fatigue syndrome? Because the cause of CFS isn't known, it’s hard to know what might put someone at risk for getting the condition. But certain factors are seen more often in people with CFS. These include: - **Being female.** CFS happens up to 2 to 4 times more often in women than in men. - **Age.** CFS often affects middle-aged people. But people of any age can get it. ## What are the symptoms of chronic fatigue syndrome? Symptoms of CFS are often nonspecific and can be seen with viruses or depression. Symptoms of long COVID are often compared to CFS. Symptoms may be a bit different for each person. The most common symptoms are: - Sensitivity to light. - Headache. - Tender lymph nodes. - Fatigue and weakness. - Muscle and joint pain. - Inability to focus. - Feelings of exhaustion after putting out physical or mental energy. - Insomnia. - Forgetfulness. - Mood swings. - Confusion. - Low-grade fever. - Depression. Many of these symptoms may be caused by other health problems. Always talk with your health care provider for a diagnosis. ## How is chronic fatigue syndrome diagnosed? A CFS diagnosis must rule out other possible conditions. According to the Institute of Medicine, a CFS diagnosis requires all three of these symptoms: - **Having to cut back greatly on the activities you did before the illness.** Severe and chronic tiredness must have lasted for more than 6 months, and other health conditions have been ruled out. Rest does not ease these symptoms. - **Severe tiredness after physical activity.** The fatigue gets worse after physical or mental stress that you could handle before the illness started. - **Sleep that doesn't refresh you.** In addition, you must have one of these symptoms: - **Trouble thinking** that gets worse under pressure. - **Orthostatic intolerance.** This means standing upright makes symptoms worse. Lying back down or raising (elevating) your feet may ease the symptoms. But it doesn't fully get rid of them. ## How is chronic fatigue syndrome treated? There is no known cure for CFS. Treatment is aimed at easing symptoms. Treatment may include: - Medicine, including corticosteroids and antidepressants. - Activity management, including a careful balancing of rest and activity to prevent flare-ups. - Light-intensity aerobic exercise, but not moderate to vigorously intense physical activity. - Dietary supplements and herbal products. - Psychotherapy and supportive counseling. ## Living with chronic fatigue syndrome There is no known cure for CFS at this time. Dealing with the severe fatigue can be very challenging. It's important to work with your health care provider to find treatments that help you. Some people find counseling or support groups helpful. ## When should I call my doctor? Contact your health care provider if your symptoms get worse or you have new symptoms. ## Key points about chronic fatigue syndrome - Chronic fatigue syndrome is marked by profound tiredness. - Symptoms often get worse with physical or mental activity. - In addition to severe tiredness, symptoms include light sensitivity, headache, muscle and joint pain, trouble concentrating, mood swings, and depression. - Treatments may include medicines, exercise, supplements, and counseling. ## Next steps Here are some tips to help you get the most from a visit to your health care provider: - Know the reason for your visit and what you want to happen. - Before your visit, write down questions you want answered. - Bring someone with you to help you ask questions and remember what your provider tells you. - At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also, write down any new instructions your provider gives you. - Know why a new medicine or treatment is prescribed and how it will help you. Also know what the side effects are and when they should be reported. - Ask if your condition can be treated in other ways. - Know why a test or procedure is advised and what the results could mean. - Know what to expect if you don't take the medicine or have the test or procedure. - If you have a follow-up appointment, write down the date, time, and purpose for that visit. - Know how you can contact your health care provider if you have questions, especially after office hours and on weekends. Medical Reviewer: Sravani Chintapalli Medical Reviewer: Sabrina Felson MD Medical Reviewer: Rita Sather RN © 2000-2025 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions. Not what you're looking for?

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