Diagnosis of fibromyalgia is difficult. There is no single pattern of fibromyalgia pain. Different people may be hurt differently. The pain may be different and at different locations. Therefore, doctors generally look for certain tender points or trigger points or pain points on the body of a patient in order to diagnose fibromyalgia. Guidelines developed by American College of Rheumatology suggest that people with fibromyalgia have pain in at least 11 tender points when a doctor applies a certain amount of pressure on them.