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[[File:Chronic-Fatigue-Patil.jpg|3206px|right|thumb|Source: Chronic fatigue syndrome: A review (Balachander et al.) 2014.<ref name=":0">{{Cite journal | last = Singh|first = Shubh Mohan | last2 = Sarkar | first2 = Siddharth | last3 = Rao | first3 = Pradyumna | last4 = Balachander | first4 = Srinivas | date = 2014-07-01 | title = Chronic fatigue syndrome: A review | url =http://www.mjdrdypu.org/article.asp?issn=0975-2870;year=2014;volume=7;issue=4;spage=415;epage=422;aulast=Balachander | journal = Medical Journal of Dr.D.Y. Patil University|language=en | volume = 7 | issue = 4 | page = 415|doi=10.4103/0975-2870.135252|issn=0975-2870|quote=|via=}}</ref>]] '''Chronic fatigue''' (CF) is a symptom that can be caused many diseases, illnesses and medications. Chronic fatigue is common in a large number of illnesses including [[multiple sclerosis]], [[fibromyalgia]], [[rheumatoid arthritis]], [[diabetes]], [[depression]], and [[chronic fatigue syndrome]]. Chronic fatigue means the patient experiences significant and long-term [[fatigue]], which may or may not have a known medical explanation. It should be distinguished from the disease called [[chronic fatigue syndrome]] (CFS), of which chronic fatigue is only one of many symptoms.<ref name="Son2019" /> The two terms are not interchangeable. Wikipedia contains separate pages for each. ==What is a syndrome?== A [[syndrome]] is a number of symptoms that commonly occur together, and may or may not be caused by the same underlying disease process. If there is only one symptom, then the word '''syndrome''' cannot be used. For example, [[Chronic regional pain syndrome]] involves multiple symptoms including pain (e.g., skin and muscle symptoms) so should not be referred to as [[chronic pain]], which is just one of many symptoms. == Chronic fatigue vs. Chronic fatigue syndrome and Idiopathic Chronic Fatigue == [[File:ChronicFatigueSyndrome-IdiopathicChronicFatigue-Differences.jpg|left|thumb|Chronic Fatigue Syndrome (CFS) is a distinct neurological disease, and is not the same as chronic fatigue, or long-term fatigue with no known cause (ICF).<br />''Source: Son, C-G (2019). Differential diagnosis between “chronic fatigue” and “chronic fatigue syndrome”. Integrative Medicine Research, 8(2), 89-91. Suggested algorithm for chronic fatigue, ICF and CFS. License: CC-BY-ND-NC.'']] Dr. [[Jarred Younger]] explains chronic fatigue and begins by stating "Fatigue is not a disease and it is not even a symptom. So fatigue is a alarm system and the most general alarm system the body has."<ref>{{Cite web | url = https://youtu.be/wJB95m4FLa0?t=364 | title = Webinar with Jarred Younger, Ph.D. | last = Younger | first = Jarred | authorlink = | date = May 20, 2016 | website = YouTube| publisher = SolveCFS| archive-url = | archive-date = |url-status = | access-date=}}</ref> [https://youtu.be/wJB95m4FLa0?t=363 Webinar with Jarred Younger, Ph.D. (Video starts with quote @6:04 and Younger discusses fatigue until @7:54)] [[Idiopathic chronic fatigue]] (ICF) refers to medically unexplained chronic fatigue lasting at least 6 months that does not meet the criteria for [[chronic fatigue syndrome]], for example [[post-exertional malaise]] (PEM) may be mild or non-existent, and [[orthostatic intolerance]] or [[cognitive impairment]] may not be present.<ref name="Son2019" /> ==<span id="PVF">Post-Viral Fatigue vs Post-Viral Fatigue Syndrome</span>== '''Post-viral Fatigue''' refers to any [[Fatigue]] that started immediately after a [[virus]], whether it is short-term or long-lasting. Post-Viral Fatigue Syndrome or PVFS is an alternative name for the neurological disease [[myalgic encephalomyelitis]] or [[chronic fatigue syndrome]]. Post-Viral Fatigue Syndrome is a the main index term used in the [[World Health Organization]]'s diagnostic manual. Any of the [[:Category:Definitions|different diagnostic criteria]] for ME or CFS can be used, provided all the symptoms started together after a viral infection which is now gone.<ref name="icd11">{{Cite web | url = https://icd.who.int/browse11/l-m/en#/http://id.who.int/icd/entity/569175314 | title = Postviral fatigue syndrome {{!}} ICD-11 - Mortality and Morbidity Statistics | last = World Health Organization | first = | date = | website = icd.who.int| publisher = WHO|language=en| archive-url = | archive-date = |url-status = | access-date=2018-10-14}}</ref> ==Terms == {| class="wikitable sortable" |- ! Cause of symptoms !! Duration and type of symptoms!! Illness name |- | Unknown - not investigated yet || Tiredness for weeks or a few months. || [[Tired all the time]], Exhaustion, or [[Fatigue]] |- | Lifestyle issues or [[burnout]] || Tiredness or other types of fatigue, for a few months || [[Fatigue]] |- | [[Virus]] || Fatigue, for weeks or a few months || [[Post-Viral Fatigue]] |- | Another illness e.g. [[multiple sclerosis|MS]], [[depression]], heart failure, [[fibromyalgia]], etc || Fatigue, usually disabling. Long term. || Chronic fatigue |- | Unknown - tests did not find a cause || Fatigue, any severity. Long term, usually over 6 months. || [[Idiopathic chronic fatigue]], unexplained chronic fatigue, or Chronic fatigue (symptom) |- | [[Virus]] || Fatigue, worsens with activity, disabling. Long term, over 6 months || [[Post-Viral Fatigue Syndrome]] or [[ME/CFS]] '''if diagnostic criteria''' are fully met, otherwise [[idiopathic chronic fatigue]] |- | [[Chronic fatigue syndrome]] or [[myalgic encephalomyelitis|ME]], whether caused by a virus or not || Fatigue, worsens with activity, disabling. Long term, over 6 months || [[Chronic fatigue syndrome]] or [[ME/CFS]] '''if diagnostic criteria''' are fully met, otherwise [[idiopathic chronic fatigue]] |} ==Examples of incorrect usage== In these examples the neurological [[disease]] chronic fatigue syndrome is erroneously referred to using the name of only one of the many symptoms involved, chronic fatigue. Chronic fatigue is a symptom, not a disease. [[Idiopathic chronic fatigue]] is the term that should be used to refer to unexplained chronic fatigue. Chronic fatigue is the term to use to refer to long term fatigue which is not necessarily caused by ME/CFS. * Feb, 2015, [http://www.dailymail.co.uk/health/article-2949369/Chronic-fatigue-real-disease-Doctors-draw-new-guidelines-diagnose-condition.html Chronic fatigue IS 'a real and serious disease': Doctors draw up new guidelines on how to diagnose the condition]<ref>{{Cite news |url =http://www.dailymail.co.uk/health/article-2949369/Chronic-fatigue-real-disease-Doctors-draw-new-guidelines-diagnose-condition.html | title = Chronic fatigue IS 'a real and serious disease', say doctors | last = Hodgekiss | first = Anna | date = Feb 11, 2015 |work=Mail Online|access-date=2018-09-10|archive-url=|archive-date=|url-status=}}</ref> *Feb, 2016, [http://www.dailymail.co.uk/health/article-3439290/Chronic-fatigue-sufferers-6-times-likely-commit-suicide.html How the hell of chronic fatigue drives sufferers to suicide: Those battling condition are SIX times more likely to take their own lives]<ref>{{Cite news |url =http://www.dailymail.co.uk/health/article-3439290/Chronic-fatigue-sufferers-6-times-likely-commit-suicide.html | title = People with chronic fatigue are 6 times more likely to commit suicide | last = Spencer | first = Ben | date = Feb 9, 2016|work=Mail Online|access-date=2018-09-10|archive-url=|archive-date=|url-status=}}</ref> == Notable studies == *2002, A factor analysis of chronic fatigue symptoms in a community-based sample [https://www.researchgate.net/profile/Leonard-Jason/publication/11345458_A_factor_analysis_of_chronic_fatigue_symptoms_in_a_community-based_sample/links/0c96051acfd16ee002000000/A-factor-analysis-of-chronic-fatigue-symptoms-in-a-community-based-sample.pdf (Full text)] * 2014, Chronic fatigue syndrome: A review<ref name=":0" /> [http://www.mjdrdypu.org/article.asp?issn=0975-2870;year=2014;volume=7;issue=4;spage=415;epage=422;aulast=Balachander (Full Text)] *2018, Association of [[Sleep dysfunction|sleep disorders]], [[chronic pain]], and [[fatigue]] with survival in patients with chronic kidney disease: A meta-analysis of clinical trials<ref>{{Cite journal | last = Yang|first = Xiu Hong | last2 = Zhang | first2 = Bao Long | last3 = Gu | first3 = Yan Hong | last4 = Zhan | first4 = Xiao Li | last5 = Guo | first5 = Li Li | last6 = Jin | first6 = Hui Min | date = 2018 | title = Association of sleep disorders, chronic pain, and fatigue with survival in patients with chronic kidney disease: a meta-analysis of clinical trials |url =https://www.sleep-journal.com/article/S1389-9457(18)30397-6/abstract | journal = Sleep Medicine|language=English | volume = 51 | pages = 59–65|doi=10.1016/j.sleep.2018.06.020|issn=1389-9457|via=}}</ref> *2019, Differential diagnosis between “chronic fatigue” and “chronic fatigue syndrome”<ref name="Son2019">{{Cite journal | last = Son | first = Chang-Gue | authorlink = Chang-Gue Son | date = Jun 2019 | title = Differential diagnosis between "chronic fatigue" and "chronic fatigue syndrome". | url = https://europepmc.org/articles/PMC6522773/ | journal = Integrative medicine research | volume = 8 | issue = 2 | pages = 89–91|doi=10.1016/j.imr.2019.04.005|issn=2213-4220|pmid=31193269|quote=|via=}}</ref> [https://europepmc.org/articles/PMC6522773/ (Full source)] == See also == *[[Chronic Fatigue Syndrome]] *[[Fatigue]] *[[Idiopathic chronic fatigue]] *[[Myalgic Encephalomyelitis]] *[[Post-exertional malaise]] (PEM) *[[Tired all the time]] *[[Fukuda criteria]] *[[Oxford criteria]] ==Learn more== *[https://www.docsopinion.com/2017/11/08/causes-fatigue-tiredness-chronic-fatigue/ 19 Important Causes of Fatigue – Tiredness and Chronic Fatigue Explained]<ref name=":02">{{Cite web | url = https://www.docsopinion.com/2017/11/08/causes-fatigue-tiredness-chronic-fatigue/ | title = 19 Important Causes of Fatigue - Tiredness and Chronic Fatigue Explained | last = Sigurdsson MD|first = Alex F. | authorlink = | date = Nov 8, 2017 | website = docsopinion.com| archive-url = | archive-date = |url-status = | access-date=2019-01-30}}</ref> *Jun 21, 2014, [https://www.youtube.com/watch?v=c2vIQ92wU9Y ME/CFS Diagnosis and Name with Dr. Nancy Klimas]<ref>{{Cite web | url = https://www.youtube.com/watch?v=c2vIQ92wU9Y | title = ME/CFS Diagnosis and Name with Dr. Nancy Klimas | last = Klimas | first = Nancy | date = Jun 21, 2014 | website = YouTube| publisher = ME/CFS Community| archive-url = | archive-date = |url-status = | access-date=}}</ref> == References == {{reflist}} [[Category:Signs and symptoms]]
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