Term Name:	chronic fatigue syndrome
Synonyms:	CFS, Myalgic encephalitis, Myalgic encephalomyelitis, Postviral fatigue syndrome
Definition:	A syndrome that involves prolonged and severe tiredness or weariness that is unrelated to exertion, is not relieved by rest and for a minimum of six months and is not directly caused by other conditions.
Ontology:	Human Disease [DOID:8544]   ( DOID:8544 )