This disorder has been found in both developed and developing countries. It has a prevalence of 2-12% in the general population. Its prevalence increases with age, most dramatically in women, with a peak in seventh decade. The risk factors for its development include physical trauma, a febrile illness, or a family history of Fibromyalgia. Patients present with:
- Pain-widespread musculoskeletal pain is the most prominent symptom. It generally occurs throughout the body although it may start in one region such as the neck and shoulders and may spread throughout over a period of time.
- Fatigue and sleep disturbance-most of them complain of fatigue, decreased endurance or kind of exhaustion felt with flu or lack of sleep. Many of them have sleeping problems. Although they may be able to fall asleep without much difficulty, they sleep lightly and wakeup frequently during the night. They often wakeup feeling tired, even after sleeping through the night.
- Mood alterations-feeling of sadness, anxious, difficulty in concentrating etc. Any kind of fluctuation in mood can be present.
- Others-Headache, abdominal pain, bloating, alternating constipation and diarrhoea are also common. UrinaryBladder spasm and irritability may cause urinary urgency or frequency. Some people experience muscle cramps and dizziness.