An ulcer is an open sore that forms on the inner lining of the stomach or small intestine, causing pain. These sores develop due to inflammation of the surface. The most common causes are H. pylori bacterial infection and the long-term use of non-steroidal anti-inflammatory drugs (NSAIDs). Ulcers can develop in the stomach (gastric ulcer) or the duodenum (duodenal ulcer); duodenal ulcers are more frequently observed than gastric ulcers. The size of ulcers can vary from 3-5 mm to 5 cm. Ulcer disease, which is about 3 times more common in men than in women, typically peaks between the ages of 30-50 but can also be frequently encountered around the age of 60. The most common symptom of an ulcer is a burning pain in the upper part of the stomach, usually occurring after meals or when hungry. This condition can significantly affect a person's daily quality of life. Ulcer treatment is generally managed with medications, especially those that reduce stomach acid and eradicate H. pylori infection.