The task and purpose of internal medicine teaching is to enable students to master the theoretical knowledge and skills of common and frequently occurring diseases in internal medicine, etiology, clinical manifestations, key points of diagnosis, prevention and treatment, so as to lay a solid foundation for learning other clinical disciplines and engaging in clinical medicine practice or basic research in the future. Internal medicine is a specialty of clinical medicine and the basis of almost all other clinical medicine. Its content covers a wide range and has strong integrity. It has its own theoretical system and is closely related to basic medicine. Its diagnosis and treatment principles and methods are also applicable to other clinical disciplines. Internal medicine is a secondary discipline, including respiratory disease, circulatory disease, digestive disease, urinary system disease, hematology, endocrine metabolism disease, rheumatism immunology and poisoning. The contents of internal medicine include the definition of disease, etiology, pathogenesis, epidemiology, natural history, symptoms, symptoms, experimental diagnosis, imaging examination, differential diagnosis, diagnosis, treatment and prognosis. The method of internal medicine is to conduct physical examination after medical history inquiry or interview, make experimental diagnosis and imaging examination according to medical history and examination, and exclude those with low possibility from many differential diagnosis to obtain the most likely diagnosis; After diagnosis, the treatment methods of internal medicine include follow-up observation, lifestyle, drugs, interventional therapy (such as cardiac catheters and endoscopes), etc. adjust the use of drugs according to the patient's condition, and prevent and deal with side effects and complications. Internal medicine is the core discipline in clinical medicine. The common diagnosis and treatment thinking of clinical medicine is mainly expressed in internal medicine; And in clinical practice, internal medicine diseases are also the most common. Therefore, learning internal medicine well is not only beneficial to learning and mastering other disciplines, but also the needs of most patients.