Most people who have stomach pain don't have an ulcer. Your doctor may use tests to decide if your stomach pain is caused by an ulcer. Ulcers may cause other medical problems. Sometimes they bleed. If the ulcers become too deep, they can break through the stomach.
Ulcers can block food from going through the intestines.
This causes nausea, vomiting and weight loss. Most people with ulcers just have stomach pain. Some people don't have any symptoms at all. Doctors used to think ulcers were caused by stress or by eating food with too much acid in it. We now know this isn't true.