<unk>  (ICF), is characterized by unexplained fatigue that lasts at least six consecutive months. It is widely understood to have a profound effect on the lives of patients who experience it. ICF is a common illness of unknown origin, and remains poorly understood.
Idiopathic chronic fatigue
Fatigue
Cancer-related fatigue
Chronic fatigue syndrome
Occupational burnout
Functional somatic syndrome
Medication phobia
Nicotine dependence