Common gastro procedures: - Colonoscopy - Over 45? Let our doctors guide you through this life-saving colon cancer screening. - EGD (upper endoscopy) - Used to diagnose chronic acid reflux. Doctors use a long, flexible tube with a camera on the end to inspect your upper GI tract. Conditions gastro doctors treat include: Abdominal Pain Celiac Disease Crohn's Disease Diarrhea Fatter Liver Disease Gas and Bloating Acid Reflux (Gastroesophageal reflux/GERD) Hemorrhoids Hepatitis C Irritable Bowel Syndrome Liver Cirrhosis Nausea and Vomiting Obesity and the GI tract Pancreatitis Swallowing Disorders Ulcerative Colitis GCSA was established in 1978 and has grown into one of the largest private GI practices in Texas.