Pain is a universal experience that serves the vital function of triggering avoidance.
Cardinal symptom of FM is widespread body pain.
Tender points at musculoskeletal junction.
Amplification of nervous system.
Some 30 years ago, Melzeck and Wall proposed that pain is a complex integration of noxious stimuli, and cognitive factors. In other words, the emotional aspects of having a chronic pain state and one's rationalization of the problem may both influence the final experience of pain.