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Postviral fatigue syndrome
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==Symptoms== By 1990, a group of core and minor symptoms of Postviral Fatigue Syndrome were described: * severe [[post-exertional malaise |fatigue made worse by exercise]] - now called post-exertional malaise (PEM) *persisting or relapsing 'fatigue' or easy fatiguability *[[myalgia]] (muscle pain) *[[depression]], which may be atypical *[[hypersomnia|excessive sleep]] or other [[sleep dysfunction|sleep disturbance]] *[[concentration problems|concentration difficulties]] *may or may not follow what appears to be an acute infectious illness, such as a [[virus]], [[bacteria]] or [[parasite]] infection<ref name="Lask1990" /><ref name="Behan2007" /><ref name="Behan1988">{{Cite web|url=https://pubmed.ncbi.nlm.nih.gov/3063394/ | title = Postviral Fatigue Syndrome | last = Behan | first = P.O. | authorlink = Peter Behan | last2 = Behan | first2 = W.M. | authorlink2 = | date = 1988 | website = Critical reviews in neurobiology|language=en|pmid=3063394|archive-url=|archive-date=|url-status=|access-date=2020-04-28}}</ref> Lask and Dillon (1990) also reported: *[[low-grade fever|mild fever]] *[[sore throat]] *[[sore lymph node]]s *[[headache]]s *migratory [[arthralgia|joint pain]] *[[photophobia|light sensitivity]] *forgetfulness *irritability<ref name="Lask1990" /> Behan and Behan (1988) also reported: *exhaustion *[[emotional lability]] Behan et al. (2007) also reported: *[[night sweat]]s (a core symptom) *dysequilibrium disorders, e.g. [[dizziness]], [[balance problems|balance]] or gait problems *[[Irritable bowel syndrome]]<ref name="Behan2007">{{Cite book | last = Behan | first = P.O. | last2 = Behan | first2 = W.M.H. | last3 = Gow | first3 = J.W. | last4 = Cavanagh | first4 = H. | last5 = Gillespie | first5 = S. | date = 2007 | url=https://onlinelibrary.wiley.com/doi/abs/10.1002/9780470514382.ch9|chapter=Enteroviruses and Postviral Fatigue Syndrome | title = Ciba Foundation Symposium 173 β Chronic Fatigue Syndrome | editor-last = Bock | editor-first = G.R.|editor-last2=Whelan|editor-first2 = J.|doi=10.1002/9780470514382.ch9|pages=|isbn=|edition=|volume=|language=|title-link=|access-date=|publisher= | author-link = Peter Behan|veditors=|others=|oclc=|quote=|archive-url=|archive-date=|location=}}</ref> In children, symptoms may include: *lethargy *headache *abdominal pain *subjective [[paresis|muscular]] weakness<ref name="Lask1990" /> These symptoms were altered and adapted over time, with over 20 different sets of [[:Category:Definitions|diagnostic criteria]] being published, and psychological symptoms including depression and emotional lability regarded as potential consequences of the illness, rather than diagnostic symptoms.<ref name="fukuda1994" /><ref name="canadianconsensus-CCC" />
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