Chronic Fatigue Syndrome (CFS)- involves the sudden onset of severe fatigue and other symptoms that must last at least 6 months and seriously interfere with a person's ability to function
*symptoms: fatigue, memory impairment, sore throat, swollen lymph glands, headache, aching muscles and joints, disrupted sleep, and worsening of symptoms after exertion; can lead to psychological problems such as depression

Informative link: CDC CFS Homepage

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