Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a disease characterized by chronic, profound, disabling, and unexplained fatigue.
Fatigue
Diagnostic Criteria for Chronic Fatigue Syndrome (CFS)
Centers for Disease Control Diagnostic Criteria
Clinically evaluated, unexplained, persistent, or relapsing fatigue that is:
- Of new or definite onset
- Not a result of ongoing exertion
- Not alleviated by rest
- Results in a substantial reduction in previous levels of occupational, social, or personal activity