What is chemotherapy? Chemotherapy is the treatment of cancer with chemical drugs to control the disease and relieve symptoms. Chemotherapy can be used alone or in combination with other treatments. Why do I need chemotherapy? Chemotherapy drugs can reach the whole body through blood circulation to kill cancer cells that cannot be reached by surgery or radiotherapy. Therefore, it is suitable for patients with all stages of tumors. Chen Xiaobing, Department of Internal Medicine, Henan Cancer Hospital, chemotherapy is a practical and effective treatment method, which can make most of the patients in remission and prolong their survival, and with surgery and radiotherapy, some of them can be clinically cured. However, the sensitivity and efficiency of chemotherapy are different for different tumor types. When patients receive chemotherapy, they need to have certain psychological preparation for toxic side effects, but they do not need to be afraid of chemotherapy. With the development of medical science and continuous improvement of medical level, the side effects of chemotherapy can be reduced or eliminated through adjuvant drug treatment. Diet during chemotherapy: Patients may have decreased appetite and fatigue during chemotherapy for lung cancer, so diet should be light and tasty, easy to digest, and provide high-calorie, high-protein and vitamin-rich food. The diet should be light, easy to digest and provide high-calorie, high-protein and vitamin-rich food. Spicy and indigestible foods are prohibited to avoid damage to the mucosa of the digestive tract. Prevention of chemotherapy complications: 1. Most chemotherapy drugs have a myelosuppressive effect, resulting in low immune function, reduced body resistance and decreased white blood cells, which can easily lead to infection. Patients need to pay attention to personal hygiene, keep the skin and mouth clean, brush the teeth and wipe the body every morning and evening. Keep indoor air circulation and freshness. 2, during chemotherapy can be appropriate to drink more water, in order to facilitate the excretion of chemotherapy drugs, and can prevent high concentrations of uric acid precipitation induced kidney stones. 3, selective use and protection of the vein, infusion to receive intravenous infusion side of the limb should not be too much activity, to prevent the puncture needle displacement caused by drug extravasation, causing local tissue necrosis. Can take the indwelling deep vein tube, PICC line method, can better ensure the smooth implementation of chemotherapy.