Peptic ulcer disease and GERD are common digestive disorders caused by an imbalance between gastric acid and the stomach's protective mechanisms. Peptic ulcers form when the stomach or duodenal lining is broken down, typically due to H. pylori infection or long-term NSAID use. GERD occurs when stomach acid backs up into the esophagus, often due to a weak lower esophageal sphincter. Both are treated using proton pump inhibitors to reduce acid production along with antibiotics for H. pylori if present. Lifestyle changes like sleeping upright and smaller meals can help prevent acid reflux.