The conventional wisdom is that internal medicine looks at diseases that do not require surgery, diseases that require oral medication or conservative treatment. Surgery mainly looks at diseases that are associated with surgery, diseases that may require surgical removal or surgical solution to the problem. Diseases such as hypertension, diabetes, and cerebral infarction need to be seen in internal medicine and treated by oral medication as well as subcutaneous insulin injections. If the pain is in the stomach, you can also see an internal medicine department and consider it to be caused by enteritis or gastritis, and just go to an internal medicine department for treatment. Surgery is for surgical removal of diseases, such as stomach or intestinal cancer, which requires surgery to cut part of the stomach or part of the intestine, and needs to be treated in surgery. Gallbladder stones and appendicitis also need to be treated surgically, and they also need to be seen in surgery. However, nowadays, there may be a crossover between internal and surgical procedures, and internal medicine doctors may also perform some surgeries, such as removing polyps under gastroscopy or removing polyps under colonoscopy.