A debilitating and complex disorder characterized by profound fatigue that lasts 6 months or longer, is not improved by bed rest, and may be worsened by physical or mental activity. Abbreviated CFS. Persons with CFS most often function at a substantially lower level of activity than they were capable of before the onset of the illness. In addition to these key defining ch
aracteristics,
patients report various nonspecific symptoms, including weakness, muscle
pain, impaired memory and/ or mental concentration, insomnia, and
postexertional fatigue lasting more than 24 hours. In some cases, CFS
can persist for years. The cause or causes of CFS have not been
identified, and no specific diagnostic tests are available. Moreover,
because many illnesses have incapacitating fatigue as a symptom, care
must be taken to exclude other known and often treatable conditions
before a diagnosis of CFS is made. Also known as chronic fatigue and
immune dysfunction syndrome (CFIDS) and myalgic encephalomyelitis (ME).
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