Chronic Fatigue Syndrome (CFS or SEID) Center

Chronic fatigue syndrome (CFS) or systemic exertion intolerance disease (SEID) is 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. Read more: Chronic Fatigue Syndrome (CFS or SEID) Article

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Medically Reviewed by a Doctor on 6/16/2021

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