Peptic Ulcer Disease is defined as a circumscribed ulceration of the gastrointestinal mucosa occurring in areas exposed to acid and pepsin. The most common causes are H. pylori infection, NSAID use, and acid exposure. Symptoms include epigastric pain that may be relieved by food or antacids. Diagnosis involves stool testing, endoscopy, and the urea breath test. Treatment consists of antibiotics to eradicate H. pylori plus acid suppression medications. Lifestyle changes and preventative medications can help reduce risk of recurrence.