(PU)definition:Pepticulcer(PU)(self-digestion)undercertainconditions,urintheesophagus,stomach,duodenum,orinthevicinityofthegastric-jejunalanastomosis,,mon,sotheso-:::gastriculcer(GU)Duodenalulcer(DU):10-20%,South>North;>Rural;:GU,ratio3:1;~:1;~:,mon,abouttenyearslater;,goodfortuneinwinterandspring;,theincidencerateoftheelderlyhasincreased,-pathogenicdisease,,gastricacidistoohigh,:roofGastricacid,pepsin:acidrainLeakyroof-nottoomuchacidrainNormalroof-toostrongacidrain8Balancetheory9NOacidNOulcer10
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