Conservative treatment refers to the means of treatment by drugs only without surgery. Generally, conservative treatment is used in the following cases: First, the condition is not serious and there is no need for surgery, so oral drugs or injectable drugs are used for treatment. Secondly, in severe cases, such as cancer or advanced tumor, which cannot receive chemotherapy or radiation therapy, in order to reduce the patient’s pain, only drugs can be used for conservative treatment, so that the drugs can reduce the patient’s pain. Thirdly, patients who are older or in poor physical condition can choose conservative treatment without considering surgery to control the development of the disease.