“Gastrointestinal diseases are health conditions that affect your gastrointestinal (GI) tract. Your GI tract is the path food takes through your digestive system — from your mouth to your rectum. It also includes your liver, pancreas and gallbladder. Some digestive system diseases cause problems that go away relatively fast with treatment. Others cause problems that are more serious.”
Cleveland Clinic (Gastrointestinal Diseases: Symptoms, Treatment & Causes)