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Gastroenterologist Bill Cassidy specializes in the digestive system and its disorders. As a physician, he focuses on diagnosing and treating conditions affecting the esophagus, stomach, small intestine, large intestine, liver, pancreas, and gallbladder. His expertise encompasses a wide range of gastrointestinal issues, including inflammatory bowel disease, irritable bowel syndrome, peptic ulcer disease, and gastroesophageal reflux disease.