H. pylori - THE ULCER BUG For many years it was thought that peptic ulcers were caused by diet and stress. H. pylori has now been linked as a causative agent not only to ulcers, but to cancer and possibly many other conditions. Learn new diagnostic tests and treatments for H. pylori along with symptoms & disease dynamics. Course Author: Mary Diehl, RN, MS (COURSE STYLE-LITE)