The nature of pain.
D000328:Adult; D000698:Analgesia; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D009424:Nervous System Physiological Phenomena; D010146:Pain; D010468:Perceptual Disorders; D010591:Phantom Limb; D011247:Pregnancy; D011602:Psychophysiologic Disorders; D012677:Sensation