It is ademobilizing condition marked with extreme exhaustion and fatigue. Chronic Fatigue Syndrome patients have a severe chronic fatigue lasting six months or longer (having excluded other potential conditions) and also having four or more of the following symptoms: substantial impairment in short-term memory or concentration, sore throat, tender lymph nodes, muscle pain, multi-joint pain without swelling or redness, headaches of a new type, pattern or severity, unrefreshing sleep, and post-exertion malaise lasting more than 24 hours.

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