Сhronic fatigue syndrome (CFS) is the most common name given to a variably debilitating disorder or disorders generally defined by persistent fatigue unrelated to exertion, not substantially relieved by rest and accompanied by the presence of other specific symptoms for a minimum of six months. The disorder may also be referred to as post-viral fatigue syndrome (PVFS, when the condition arises following a flu-like illness), myalgic encephalomyelitis (ME), or several other terms. The disease process in CFS displays a range of neurological, immunological, and endocrine system abnormalities. Although classified by the World Health Organization under Diseases of the nervous system, the etiology (cause or origin) of CFS is currently unknown and there is no diagnostic laboratory test or biomarker.Read more on Wikipedia
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