Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a disease that causes someone to feel so ill that they can't do their normal daily activities. People with ME/CFS have problems sleeping and extreme fatigue that doesn't get better with rest. Any kind of activity often makes their symptoms worse. This is called post-exertional malaise. They may have other symptoms like problems with thinking.
Another name for this condition is systemic exertion intolerance disease (SEID).
Medical Review:Anne C. Poinier MD - Internal Medicine & E. Gregory Thompson MD - Internal Medicine & Martin J. Gabica MD - Family Medicine & Adam Husney MD - Family Medicine & Lucinda Bateman MD - Internal Medicine & Marco Mannarino MD - Family Medicine