Composition comprising diamine oxidase for use in the treatment or prevention of fibromyalgia or chronic fatigue syndrome

A method of treating a patient,

• wherein the patient presents the symptoms and disorders caused by fibromyalgia or chronic fatigue syndrome,
• wherein the symptoms and disorders comprise fatigue, sleep disorders and musculoskeletal pain,
• wherein the method comprises administering to said patient a composition comprising diamine oxidase (DAO), and
• wherein the administering results in a treatment of the patient, wherein the treatment is characterized by an effect selected from the group consisting of relief from the symptoms and disorders of fibromyalgia or chronic fatigue syndrome, reduction of any direct or indirect pathology of fibromyalgia or chronic fatigue syndrome, reduction of the speed of progression of fibromyalgia or chronic fatigue syndrome, improvement of fibromyalgia or chronic fatigue syndrome, prevention of recurrence of fibromyalgia or chronic fatigue syndrome, or combinations thereof.