Digestive system diseases refer to a group of medical conditions that affect the organs and structures involved in the process of digestion. These diseases can include disorders of the esophagus, stomach, small intestine, large intestine (colon), liver, gallbladder, and pancreas. Common examples of digestive system diseases include gastroesophageal reflux disease (GERD), peptic ulcers, irritable bowel syndrome (IBS), inflammatory bowel disease (IBD), gallstones, and liver cirrhosis, among others. Proper diagnosis and treatment of these diseases are crucial to maintain digestive health and overall well-being.