Fibromyalgia is a disease whose origin is not really known. It affects women more frequently. The main symptom is chronic pain, often diffuse, but sometimes localized in one part of the body. Various examinations have been performed looking for a medical cause of the pain, and were not able to find any cause. The absence of a cause as well as the chronic nature of the disorder over time are often responsible for psychological and social repercussions. The different therapies implemented are not always effective. A psychosomatic origin is sometimes proposed.