peptic ulcer disease pud, stomach ulcer or gastric ulcer

abdominal anatomical anatomy bacteria bacterial body canal cancer care diagnosis diagram digestion digestive disease duodenal duodenum endoscope endoscopy esophagus gastric gastritis gastrointestinal gut health healthcare healthy helicobacter human indigestion infection inflammation medical medicine mucosa organ peptic pud pylori pyloric reflux science sphincter stomach surface system tissue treatment ulcer ulcers upper