Fibromyalgia is often difficult to diagnose as the symptoms vary considerably and could have other causes. They can be similar to the symptoms of other conditions, for example an underactive thyroid gland (hypothyroidism). Your doctor may suggest you have blood tests to rule out other conditions.
A diagnosis of fibromyalgia is made if you have specific tender points in certain areas of your body. These areas can be tender even when they’re pressed very gently. While tenderness can occur at individual sites in other conditions, for example tennis elbow, if you have fibromyalgia you’ll have tenderness in many different parts of your body – usually 11 or more.