H. pylori is a stomach bacteria that most people never notice, but it can cause ulcers and raise cancer risk. Here's what to know about symptoms and treatment.
Diarrhea has several distinct causes, from infections and food intolerances to chronic conditions. Learn what's actually happening in your gut and when to see a doctor.
STIs are caused by bacteria, viruses, parasites, and fungi — each spreading and behaving differently in the body. Here's what that means for your health.