Tertiary prevention of malignant tumors refers to the preventive and diagnostic measures taken during the management of malignant tumors. Primary prevention of tumors, also known as etiological prevention, refers to the prevention of tumors by eliminating tumor risk factors or avoiding exposure to carcinogens. Despite the different etiologies of malignant tumors and differences in risk factors, malignant tumors can generally be avoided to the greatest extent possible by avoiding contact with malignant tumor predisposing factors. Secondary prevention of tumors refers to three-early prevention, that is, early detection, early prevention and early treatment. The main purpose of secondary prevention is to inhibit the further development of incipient tumors. Tertiary prevention of tumor refers to the clinical diagnosis and treatment means and rehabilitation means, so that some middle and late-stage tumor patients can get better treatment, improve the quality of life of the patients, relieve their pain, and promote their recovery, and the tertiary prevention of tumor takes the postoperative rehabilitation integrated treatment, physical support, painless treatment and end-of-life care as the main measures.