The document summarizes 5 common digestive diseases: 1) Gastroesophageal reflux disease (GERD) which occurs when stomach acid flows back into the esophagus, causing heartburn and other symptoms. Prevention includes avoiding certain foods. 2) Celiac disease, an autoimmune reaction to gluten that damages the small intestine and causes diarrhea, fatigue, and other symptoms. The only treatment is a lifelong gluten-free diet. 3) Irritable bowel syndrome (IBS) is a common disorder of the large intestine causing abdominal pain, bloating, diarrhea and/or constipation. Symptoms can often be managed by diet, lifestyle, and stress reduction or medication. 4) Ulcerative colitis is