
In March 1988, the CDC released criteria for a diagnosis of CFS; it revised these in 1994 to encompass the broader symptom spectrum of those afflicted. In order to be diagnosed with CFS, a person has to be suffering from these symptoms:
1) New, unexplained, persistent, or relapsing chronic fatigue that is not a consequence of exertion, not resolved by bed rest, and severe enough to significantly reduce previous daily activity; and
2) Four or more of the following symptoms for at least six months:
• Unexplained or new headaches
• Short-term memory or concentration impairment
• Muscle pain
• Pain in multiple joints unaccompanied by redness or swelling
• Unrefreshing sleep
• Postexertion malaise that lasts for longer than 24 hours
• Sore throat
• Tender lymph nodes in the neck or armpits
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