The digestive system is a huge system, involving many organs, so there are many common diseases, which can be summarized into these categories: 1, gastric diseases, such as gastritis, gastric ulcer, gastric erosion, gastric polyps, etc. The main symptoms are stomach pain, bloating, acid reflux, heartburn, nausea, dry mouth, bitter mouth, etc. 2, liver and gallbladder diseases, such as fatty liver, viral hepatitis, cirrhosis, cholecystitis, gallbladder stones, gallbladder polyps, etc, gallbladder polyps, etc. The symptoms are mainly swelling and pain in the liver area or accompanied by jaundice and fever, etc. 3, intestinal diseases, including enteritis, ulcerative colitis, gastrointestinal dysfunction, etc. The symptoms are mainly abdominal pain, bloating, constipation, diarrhea, etc. 4, pancreatic diseases, mainly acute and chronic pancreatitis, accompanied by fever and pain in the left upper abdomen. Because of the wide variety of diseases, it is best to do relevant tests to clinically confirm the diagnosis.