All organs of human body systems gradually age with the passage of years and the growth of age. Older people have weak resistance to disease and poor repair ability, and are prone to disease and mixed with many diseases, and also become a high incidence of many malignant tumors. The older the age, the higher the incidence rate, which is 5-40 times that of young people. I. Clinical characteristics of cancer in the elderly 1. Cancer in the elderly is mostly associated with other diseases: cardiovascular, cerebrovascular, chronic pulmonary emphysema, diabetes, prostate enlargement, etc. Features: Signs and symptoms may not necessarily match with pathology, and pathological changes are heavier than clinical manifestations and appear earlier. It should be carefully analyzed and systematically examined. 2. Elderly patients are prone to cachexia: low food intake, low basal metabolic rate, low resistance to disease, vigorous metabolism of tumor tissues and increased body consumption, which affects the rational treatment of the system. 3.Elderly cancer is easy to be misdiagnosed: other conditions cover up, atypical clinical manifestations, poor general condition, slow response and high pain threshold, which are easy to be ignored. 4.Cancer in the elderly commonly has multiple primary tumors: exposure to various external carcinogenic factors for a long time, or related to the induction of the first tumor treatment factor itself. Anti-cancer drugs are both anti-cancer and carcinogenic. 5. Precancerous lesions in the elderly are prone to mutate into cancer: benign lesions are prone to mutation induced by carcinogenic factors due to weakened organs and low immune function in the elderly, so it is important to review and treat precancerous lesions regularly. 6. Elderly cancer is prone to hyponatremia and hypercalcemia: tumors produce antidiuretic hormone, causing water retention and hyponatremia, and invasion of bone tissue or myeloma patients produce hypercalcemia. Osteolysis may occur due to inhibition of osteoblast activity or bone metastasis. Myeloma and lymphoma produce osteoclast activating factor to cause hypercalcemia. 7. Cancer in the elderly has a high incidence of disseminated intravascular coagulation DIC due to frailty, low immune function, high blood viscosity, and high incidence of secondary infection sepsis. 1. Elderly people have poor tolerance to drugs and are prone to poisoning, so they should be careful with drugs: physiological function is reduced, drug metabolism is slow; renal function is degraded, renal blood flow and glomerular filtration rate are reduced; liver detoxification function is reduced; chemotherapy drugs have poor specificity, while killing cancer cells, they also have killing effect on normal tissues, so fixed drugs and measurements should not be chosen uniformly. Therefore, when treating cancer in the elderly, the best solution is to support and fight against cancer. Therefore, when treating cancer in the elderly, we should implement the comprehensive treatment combining Chinese and Western medicine: in the early stage, we should try to remove the cancer by surgery; in the late stage, on the basis of Chinese medicine to protect the normal function of the body, we should consider radiotherapy; in the elderly, the dose of chemotherapy and the area of radiotherapy should be reduced appropriately; Chinese medicine emphasizes the combination of identification and disease identification, and the treatment principle: on the basis of identification and treatment, examining the cause and treating the root of the disease, we should pay attention to the vital energy. Chinese medicine emphasizes the combination of diagnosis and diagnosis of the disease. Avoidance of food is controversial: it varies from person to person depending on the disease, without favoritism or selection of food, and whole nutritious food. Qigong is one of the independent therapies of Chinese medicine, which should be persistent and combined with work and rest to be effective.