No reaction to chemotherapy does not mean that the disease is mild. The presence or absence and size of adverse reactions after chemotherapy are not directly related to the severity of the disease, which is mainly judged according to the tumor stage and grading. The chemotherapy drugs used by cancer patients are cytotoxic, which will damage all kinds of cells and organs in the body and cause adverse reactions such as nausea, vomiting, fatigue, tiredness, loss of appetite, etc. The size of the post-chemotherapy reaction is mainly related to the patient’s physical strength. If the patient’s physical condition is poor, his tolerance to chemotherapy drugs is low, and the reaction will be big. Patients with good physical condition and high tolerance to chemotherapy drugs may not have any reaction at the beginning, but with the increase in the number of chemotherapy treatments, the damage caused by the drugs to the body accumulates and worsens, and there will still be a large reaction in the later stage. During chemotherapy, patients should pay attention to rest, eat a light diet, ensure adequate nutrition, and eat more food rich in selenium, protein and vitamins, such as fish, eggs, milk, kiwifruit, etc., which can help reduce the occurrence of adverse reactions to a certain extent.