Conservative treatment for cancer is not good because conservative treatment is not the main treatment for cancer, and if cancer patients only use conservative treatment, they will easily miss the best treatment time for cancer. Cancer is considered as a malignant tumor originated from epithelial tissue, with biological characteristics such as abnormal cell differentiation and proliferation, uncontrolled growth, invasiveness and metastasis. If the cancer belongs to early stage, the best treatment is radical surgical resection. If the cancer has progressed to the middle or late stage, and it is difficult to remove the cancer cells completely by surgery, it is necessary to combine with radiotherapy, chemotherapy, targeted therapy, immunotherapy, etc., in order to control the progression of the disease and prolong the survival period of patients. It is suggested that cancer patients should seek medical treatment in hospitals in time, and doctors will formulate appropriate treatment plans according to their specific conditions. It is not recommended that patients blindly undergo conservative treatment to avoid affecting the control of their condition.