The relation of injury to pain.
D000818:Animals; D003216:Conditioning, Operant; D003863:Depression / Q000523:psychology; D006801:Humans; D010146:Pain / Q000209:etiology*; D010148:Intractable Pain / Q000209:etiology / Q000523:psychology; D011601:Psychophysics; D014947:Wounds and Injuries / Q000150:complications*