| 80 to 90% women, usual age 20 to 55 years |
| Myalgias and fatigue in more than 90% |
| Associated common symptoms |
| Neurocognitive and mood disturbances |
| Headaches |
| Sleep disturbances |
| No identifiable cause |
| Testing not helpful |
| Physical examination usually normal except for tender points which are present in most patients with both conditions |
| Normal laboratory and radiologic tests |
| Chronic symptoms, no highly effective therapy |
