| ICD9 = | ICDO = | OMIM = | MedlinePlus = 001244 | eMedicineSubj = med | eMedicineTopic = 3392 | eMedicine_mult = | MeshID = D015673 |}}Chronic fatigue syndrome (CFS) is the most common name given to a poorly understood, variably debilitating disorder or disorders of uncertain causation. It is also commonly known as myalgic encephalomyelitis or ME.Symptoms of CFS include widespread muscle and joint pain, cognitive difficulties, chronic, often severe