Depression and chronic pain.

Chronic pain and major depression commonly occur together. Major depression in patients with chronic pain is associated with decreased function, poorer treatment response and increased health care costs. The experience and expression of chronic pain vary between individuals, reflecting complex and changing interactions between physical, psychological and social processes. The diagnosis of major depression in patients with chronic pain requires differentiation between the symptoms of pain and symptoms of physical illness. Antidepressants and psychological therapies can be effective and should be delivered as part of a coordinated, cohesive, multidisciplinary pain management plan.