title: Letter: Pain in gastric ulcer.
mesh_terms: D004947:Esophagus / Q000187:drug effects / Q000294:innervation; D006801:Humans; D006851:Hydrochloric Acid / Q000494:pharmacology; D009474:Neurons / Q000187:drug effects; D010146:Pain / Q000209:etiology*; D012018:Reflex; D013276:Stomach Ulcer / Q000150:complications*
chemical_list: D006851:Hydrochloric Acid