The Neuropsychiatry of Fibromyalgia – Etiology and Management
Fibromyalgia is a chronic pain syndrome that is characterised by widespread pain, joint stiffness and multiple tender points around the body. There is a prevalence of between 2% to 8% of the population, and it typically affects young to middle-aged women although this disorder is not restricted by country, culture, age, or sex. 
In addition to chronic pain, patients with fibromyalgia report a number of somatic and cognitive difficulties. These include mood disorders, persistent fatigue, cognitive dysfunction, headaches, irritable bowel syndrome, and insomnia.
Fibromyalgia, therefore, can be conceptualised as an entity with abnormalities spanning a range of symptom domains – cognition, fatigue, mood, anxiety and sleep. 
Arnold L et al., Comorbidity of fibromyalgia and psychiatric disorders. Journal of Clinical Psychiatry. 2006