Doctors don't know what causes chronic fatigue syndrome (CFS). For many people, CFS symptoms start after a viral illness. In some cases, CFS seems to follow a major physical or emotional trauma or an exposure to toxins. But there is no single known cause of CFS.
Other theories point to the immune system, glands and hormones, and family history. But again, there's not enough evidence to prove a solid connection.
WebMD Medical Reference from Healthwise
March 12, 2014
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