Finally, individuals with severe pathological fatigue might experience states that are very different from what a healthy individual experiences when fatigued.

Myalgic Encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a disabling condition characterized by severe unexplained fatigue and a mixed profile of symptoms such as sore throat, painful/swollen lymph nodes, muscle pain, joint pain, headaches, unrefreshing sleep, post-exertional malaise and cognitive difficulties (K. Fukuda et al., 1994).

the disabling fatigue experienced by individuals with ME/CFS differs from that associated with other illnesses or everyday activity

Severe, persisting fatigue is a prominent symptom of Myalgic Encephalomyelitis/chronic fatigue syndrome (ME/CFS), but individuals with this illness frequently report the occurrence of unique fatigue states that might be different from conventional symptoms of fatigue.