The difference between respiratory medicine and internal medicine: respiratory medicine is a more finely divided subject within the scope of internal medicine, mainly looking at respiratory system diseases, such as pneumonia, bronchitis, bronchiectasis, emphysema, lung tumors and other diseases, which have to be treated in respiratory medicine. Internal medicine is the big subject, including many subjects in it, and also includes respiratory medicine, there are respiratory medicine, cardiovascular medicine, neurology, nephrology, endocrinology, etc., all belong to internal medicine diseases. Therefore, the difference between the two is that one is a general subject and the other is a graded subject; one is a big subject and the other is a lower branch subject, so the two are different and can be integrated together.