ME/CFS (Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome) is a disorder distinguished by symptoms of severe fatigue as well as cognitive impairments, sleep disturbances, and pain. Research has shown that this disorder is not a psychiatric disorder, but many doctors still believe it to be psychosomatic in nature and treat it with interventions intended for psychological disorders, such as cognitive behavioral therapy and graded exercise therapy, which can be harmful to the outcome of ME/CFS patients. Thus, it is important for clinical psychologists to better understand this disorder.