Upper abdominal pain is a symptom common to peptic ulcers, including dull, mild, or bloating pain, which is generally tolerable and varies in characteristics. For instance, the pain from a gastric ulcer is usually located in the upper abdomen, predominantly on the upper left side, and sometimes extends to the lower abdomen. It typically occurs about half an hour to an hour after meals and gradually eases after two to three hours. For duodenal bulb ulcers, the pain is generally around two fingers to the right of the belly button. It often presents as hunger-like pain in the upper abdomen, accompanied by nighttime pain. If it is a post-bulbar ulcer, it often causes back pain. Complex ulcers may exhibit characteristics of both types. Additionally, ulcers are generally associated with excessive stomach acid, leading to symptoms like acid reflux, heartburn, and abdominal bloating. If there is bleeding, it is often accompanied by black stools or even vomiting blood.