The clinical manifestations of stomach ulcers can vary from person to person. Some patients are asymptomatic and present to the clinic due to stomach bleeding or perforation. Generally, there are three main characteristics of peptic ulcers: First, they tend to be a chronic, recurrent condition. Second, they exhibit periodicity. Third, they have rhythmic manifestations. The primary symptom is periodic, rhythmic upper abdominal pain, often described as burning, dull, or bloating pain. This usually occurs in the upper abdomen, possibly on the left or right side, and typically manifests as post-meal pain. Nighttime pain is uncommon, and there may be localized tenderness. If the ulcer occurs in the pyloric canal, it may lack some of these typical symptoms. Post-meal intense pain is possible, and the effectiveness of medication is generally poor. This condition can easily lead to vomiting or pyloric obstruction and is also prone to perforation and bleeding. A minority of stomach ulcers may potentially become cancerous.