Most of them are caused by the bacterium H. Pylori and
some are worsened by drugs such as aspirin, Plavix
(clopidogrel), ibuprofen, and other NSAIDs. They can affect the esophagus, stomach, duodenum or meckel’s diverticulum and cause abdominal pain, bloating, fullness, nausea, heartburns, acidity and vomitings.
It can cause perforation, bleeding into the abdomen and swelling due to ulcers causes narrowing in the duodenum and gastric outlet obstruction.