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CFS/ME/PVF n. a condition, known variously as chronic fatigue syndrome, myalgic encephalomyelitis (or encephalopathy), and postviral fatigue syndrome, characterized by extreme disabling fatigue that has lasted for at least six months, is made worse by physical or mental exertion, does not resolve with bed rest, and cannot be attributed to other disorders. The fatigue is accompanied by at least some of the following: muscle pain or weakness (see fibromyalgia), poor coordination, joint pain, recurrent sore throat, slight fever, painful lymph nodes in the neck and armpits, depression, cognitive impairment (especially an inability to concentrate), and general malaise. The cause is unknown, but some viral conditions (especially glandular fever) are known to trigger the disease.
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