The following should usually be noted when chemotherapy is administered: (1) When chemotherapy is administered for malignant tumors, it should be administered only after pathological confirmation (except for diagnostic treatment); (2) Most patients have huge psychological fluctuations after diagnosis and have fearful thoughts about both disease and treatment; therefore, during chemotherapy, in addition to disease treatment, attention should be paid to psychological guidance and antidepressant and anti-anxiety treatment should be given when necessary. (3) Many chemotherapy drugs will damage the gastrointestinal mucosa to a certain extent, therefore, when patients do chemotherapy, they should eat highly nutritious and easily digestible food and avoid stimulating food; (4) In order to ensure that patients avoid gastrointestinal reactions, a large amount of antiemetic drugs are generally given during chemotherapy, these drugs often cause constipation, therefore, attention should be paid to giving laxative and laxative drugs against. (6) Generally speaking, while killing or inhibiting tumors, anti-tumor chemical drugs often have a greater impact on normal cells of human body, especially proliferating cells, so some toxic side effects may occur. (7) Chemotherapy, if applied improperly, can also cause some long-term toxic reactions, such as teratogenic fetuses, etc. Therefore, attention should be paid to contraception during treatment, and early pregnant women should not be treated as described above. (8) Many chemotherapy drugs have different degrees of damage to the patient’s normal tissues, and some patients may experience weakness and drowsiness, so they should not make strong physical exercise during chemotherapy to maintain physical strength and minimize sexual life. (9) Chemotherapy tends to reduce the immunity of patients, resistance decreases, and cold symptoms can easily occur, so in the process of chemotherapy, attention must be paid to prevent cold. (10) The most serious toxic side effect of chemotherapy is bone marrow suppression, causing a drop in white blood cells, which may have serious consequences, therefore, regular blood tests must be performed. (11) If applied simultaneously with radiotherapy, one must be cautious, because the simultaneous treatment of radiotherapy and chemotherapy is a double-edged sword, and if it is not done well, one often hurts oneself first. It is recommended to seek guidance from an experienced doctor, and not to proceed blindly and thoughtlessly.