Absolutely does, there are multiple causes of ulcers. Canker sores in your mouth are caused by either stress or vitamin deficiency and they're still "ulcers". A

Absolutely does, there are multiple causes of ulcers. Canker sores in your mouth are caused by either stress or vitamin deficiency and they're still "ulcers". And what H. Pylori does is a huge cause of gastric cancer, so pathogens damaging the body is a factor. I agree with the top comment of this tree that we can't see science as set in stone, but many things have multiple causes that work separately or synergistically