The best replacement for duodenal ulcer is gastric ulcer.

The best alternatives to duodenal ulcer are rated as following:
★★★★★  gastric ulcer
★★  peptic ulcer
★  gastric
  stomach ulcer
  gastric ulcer pain

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Speaking about duodenal ulcer, one probably shouldn't forget about pylori.

Other search terms related to duodenal ulcer and their ratings are:
★★★★★ pylori
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duodenal ulcer
gastric ulcer
peptic ulcer