Gastrointestinal (GI) disorders are conditions that affect the digestive system, including the stomach, small intestine, large intestine (colon), rectum, and esophagus. Common GI disorders include irritable bowel syndrome (IBS), gastroesophageal reflux disease (GERD), peptic ulcer disease, and inflammatory bowel disease (IBD). Symptoms of GI disorders can include abdominal pain, bloating, diarrhea, constipation, and nausea. Treatment for GI disorders depends on the specific condition and may include lifestyle changes, medications, or surgery.