Most of the patients who have colds after chemotherapy should be able to heal themselves. Nowadays, there are more tumor patients in the clinic. While tumor patients are treated, especially after chemotherapy, the resistance of patients’ body is reduced. Because the chemotherapy drug itself has an inhibitory effect on tumor cells, it has a certain damage effect on other cells, including immune system. However, this damage is transient and not continuous. Therefore, in the period after chemotherapy, patients must pay attention to prevent infections, especially colds. Patients are also very prone to colds during this period because the immune system is suppressed. Once a patient has a cold, it is self-limiting as the immune system recovers, and most of them are able to get better. But after all, the patient’s resistance is reduced, and the cold symptoms may be heavier than normal patients, and the infection is more likely to worsen, possibly resulting in secondary pneumonia, viral pneumonia and other conditions. So if such a patient is considered to have a cold, it is recommended to take anti-influenza drugs, such as oseltamivir, for treatment. It is also necessary to take resistance-enhancing drugs, which have a protective effect on the organism. Clinically, even without any medication, patients can heal themselves in most cases and the problem is not very big.