Common diseases in gastroenterology include gastroesophageal diseases, intestinal diseases, liver and gallbladder diseases, pancreatic diseases, etc. Different diseases have different clinical manifestations. Esophageal diseases may have symptoms such as epigastric pain and belching, intestinal diseases may have symptoms such as diarrhea and abdominal pain, hepatobiliary diseases may have symptoms such as abdominal pain and nausea, and pancreatic diseases may have symptoms such as abdominal pain and elevated blood sugar. 1. Gastroesophageal diseases: patients with reflux esophagitis may have epigastric pain, epigastric burning sensation, belching and other symptoms; chronic gastritis may have abdominal pain, abdominal distension, nausea, loss of appetite and other symptoms; gastric ulcers can be manifested in the form of abdominal pain after eating, but also accompanied by abdominal distension, nausea, belching and other symptoms. 2. Intestinal diseases: inflammatory bowel disease can have diarrhea, abdominal pain and other symptoms; intestinal polyps can have blood in the stool, abdominal pain, change in bowel habits and other symptoms. 3. Liver and gallbladder diseases: cholecystitis can have abdominal pain, nausea, vomiting, fever and other symptoms; fatty liver can be asymptomatic, and some patients may also have weakness, loss of appetite, abdominal pain and other symptoms. 4. Pancreatic diseases: chronic pancreatitis can have abdominal pain, abdominal discomfort, elevated blood sugar and other symptoms; acute pancreatitis can have nausea, vomiting, abdominal pain and other symptoms. When symptoms similar to those of digestive diseases occur, it is recommended that you go to the hospital and get a clear picture of the cause of the disease under the guidance of a professional physician.