In Fibromyalgia Syndrome - a practitioner's guide to treatment Leon Chaitow and his contributors provide a comprehensive overview of this epidemiologically significant condition and describe the most effective multidisciplinary approaches to treatment. Fibromyalgia Syndrome (FMS) was recognised as a syndrome by the WHO in 1990. Sufferers from this complex syndrome may experience a wide variety of symptoms, ranging from headaches and fatigue to widespread muscular pain or irritable bowel syndrome. FMS is the second commonest condition encountered in clinics for the treatment of chronic pain.