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Idiopathic chronic fatigue
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==Differences from chronic fatigue syndrome== [[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).<ref name="Son2019" /> ''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.'']] {{clear}} <div style="column-count:2;webkit-column-count:2;-moz-column-count: 2;" class="hlist"> *Idiopathic chronic fatigue is a distinct illness but not classed as either a syndrome or disease. *Idiopathic chronic fatigue only requires the symptom of [[chronic fatigue|chronic fatigue.]] which is not explained by another medical condition, and does not meet the CFS criteria.<ref name="fukuda1994"/><ref name="Son2019" /> *Idiopathic chronic fatigue does not require either [[post-exertional malaise]] or [[sleep dysfunction]], which are both compulsory symptoms for a CFS diagnosis. *Idiopathic chronic fatigue is more common in the elderly and becomes more common with ageing.<ref name="Valiani2019" /> *Idiopathic chronic fatigue is a classed as a general diagnosis rather than neurological or musculoskeletal, and uses ICD-11 code MG22,<ref name="ICD-11">https://icd.who.int/browse11/l-m/en#/http%3a%2f%2fid.who.int%2ficd%2fentity%2f1829103493</ref> and ICD-10-CM code R53.8.<ref name="ICD-10-CM">{{cite web |url=https://icd10cmtool.cdc.gov/?fy=FY2022&query=fatigue |website=National Center for Health Statistics|title=R53 Malaise and fatigue {{!}} General symptoms and signs (R50-R69) {{!}} ICD-10-CM Index and Tabular|date=2007|access-date=2022-09-21}}</ref><ref name="ICD10-CM">https://www.cdc.gov/me-cfs/healthcare-providers/diagnosis/icd-10.html</ref> *Chronic fatigue syndrome is a [[neurological disorder|neurological disease]], and the ICD-11 code 8E49<ref name="ICD11-CFS">{{Cite web|url=https://icd.who.int/browse11/l-m/en#/http://id.who.int/icd/entity/569175314|title=8E49 Postviral fatigue syndrome |last=World Health Organization|first=|authorlink=World Health Organization|date=|website=ICD-11 - Mortality and Morbidity Statistics|language=en|archive-url=|archive-date=|access-date=2022-03-19|quote='''8E49 Postviral fatigue syndrome'''<br />Other disorders of the nervous system<br />Inclusions<br />chronic fatigue syndrome<br/>myalgic encephalomyelitis<br />Exclusions<br/>Fatigue (MG22)}}</ref> and ICD-10-CM code G93.32 both reflect this.<ref name="ICD-10-CM"></ref> *[[Chronic fatigue syndrome]] is a multi-systemic illness with a wide variety of symptoms, which may include: immune symptoms, cardiovascular symptoms, [[post-exertional malaise]], [[headache]]s or [[migraine]]s, and [[chronic pain]].<ref name="Son2019" /><ref name="fukuda1994">{{Cite journal | last = Fukuda | first = K. | authorlink = Keiji Fukuda | last2 = Straus | first2 = S.E. | author-link2 = Stephen Straus | last3 = Hickie | first3 = I. | author-link3 = Ian Hickie | last4 = Sharpe | first4 = M.C. | author-link4 = Michael Sharpe | last5 = Dobbins | first5 = J.G. | authorlink5 = James Dobbins | last6 = Komaroff | first6 = A. | author-link6 = Anthony Komaroff | date = 1994-12-15| title = The chronic fatigue syndrome: a comprehensive approach to its definition and study. International Chronic Fatigue Syndrome Study Group | url =https://www.researchgate.net/profile/Michael_Sharpe2/publication/247808895_The_Chronic_Fatigue_Syndrome_A_Comprehensive_Approach_to_Its_Definition_and_Study/links/0c96053201643bfc4b000000/The-Chronic-Fatigue-Syndrome-A-Comprehensive-Approach-to-Its-Definition-and-Study.pdf | journal=Annals of Internal Medicine|volume=121|issue=12 | pages = 953–959|issn=0003-4819|pmid=7978722|via=|publisher=American College of Physicians}}</ref> *Chronic fatigue syndrome is most common in teenagers and working age adults. *Idiopathic chronic fatigue is generally considered less disabling.<ref name="Valiani2019" /> </div>
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