Chronic fatigue syndrome sufferers experience overwhelming exhaustion of both muscle and mind, flu-like symptoms, joint pain, muscle pain, migraine and insomnia. A special feature of CFS is that the condition waxes and wanes; this can occur within an hour, a day or over a period of years.
The CFS Research Foundation was officially launched in 1993 to bring together the best minds to meet the challenge presented by chronic fatigue syndrome, encouraging basic research into the body mechanisms that lead to and continue the illness.
http://www.cfsresearchfoundation.org.uk/