Headache, chronic pain syndrome and fibromyalgia often occur together and all have abnormalities of pain transmission as a central problem. Pain has a tendency to both amplify and spread with time, the longer the pain is present the higher the intensity and the more it spreads throughout the body. In patients with whiplash injury, patients that developed neck pain for longer than three months developed fibromyalgia while those with symptoms lasting less than three months did not develop fibromyalgia. Poor sleep, fatigue and poor mood are common features of fibromyalgia.
