Arthralgia

Prevalence

 * 77.1% - 73.3% of the 2073 patients in a Belgian study of 2001 reported arthralgia.
 * Katrina Berne reports a prevalence of 65-95% for muscle and/or joint pain, neck pain.

Symptom recognition

 * In the Canadian Consensus Criteria, pain is a required criteria for diagnosis. It requires that "there is a significant degree of myalgia. Pain can be experienced in the muscles, and/or joints, and is often widespread and migratory in nature. Often there are significant headaches of new type, pattern or severity."
 * In the Fukuda criteria, the symptom of multi-joint pain without swelling or redness can be used to help form a diagnosis.