H. pylori, or helicobacter pylori, is a bacterial infection that causes stomach ulcers. Symptoms of H. pylori may not be present, but if they are, you may experience weight loss, burning abdominal pain, bloating, nausea, and more. There are several tests that can diagnose H. pylori. Treatments include antibiotics, medications to reduce stomach acid, and possibly surgery to treat the ulcers. You may also need to adjust your diet to reduce the amount of spicy foods and acidic drinks you consume. Follow the links below to find WebMD's comprehensive coverage about how H. pylori is caused, how to treat it, and much more.