Peptic ulcer.
D003163:Competitive Behavior; D005744:Gastric Acid / Q000378:metabolism; D006706:Homeostasis; D006801:Humans; D010437:Peptic Ulcer / Q000209:etiology / Q000523:psychology* / Q000628:therapy; D011613:Psychotherapy / Q000379:methods; D013315:Stress, Psychological / Q000150:complications