Peptic Ulcer Disease (PUD) refers to painful sores that develop in the lining of the stomach or the first part of the small intestine, known as the duodenum. These ulcers occur when the protective mucus layer is damaged, often due to excessive stomach acid or infection by the Helicobacter pylori bacteria. Symptoms may include burning stomach pain, bloating, and nausea. Treatment for PUD typically involves medications to reduce stomach acid and antibiotics to eliminate the H. pylori infection. Lifestyle changes, such as avoiding spicy foods, alcohol, and smoking, can also help manage symptoms and promote healing. If left untreated, peptic ulcers can lead to serious complications.