title: The nature of pain.
mesh_terms: D000293:Adolescent; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009730:Nursing Assessment; D010146:Pain / Q000451:nursing* / Q000503:physiopathology; D010148:Intractable Pain / Q000451:nursing; D010347:Patient Care Planning