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The symptoms of chronic fatigue syndrome (CFS) vary widely between individuals but usually symptom onset is sudden, with an affected person becoming persistently or frequently tired for no apparent reason.
Diagnostic criteria are based on a pattern of symptoms which are observed over time as no one symptom or laboratory test can confirm a diagnosis of CFS. The Centers for Disease Control and Prevention recommends that a diagnosis of CFS is considered when the fatigue is:
In addition, one of the following features should be present:
Other associated factors and symptoms include: