Symptoms of hot and cold spells after chemotherapy may be caused by chemotherapy side effects or by the presence of infections in the patient, for example. After patients use chemotherapy drugs, a series of adverse symptoms may occur, such as strong nausea, vomiting, diarrhea and so on. In some cases, the use of chemotherapeutic drugs may cause a decrease in white blood cells, at which point the patient may experience symptoms of hot and cold spells. Cancer patients usually have weaker resistance than normal people, especially after chemotherapy, they are prone to body infections. When infection occurs, it will cause the patient to be hot and cold. Some patients may suffer from malnutrition after chemotherapy due to severe nausea and vomiting, which may also cause symptoms of hot and cold spells. When symptoms of hot and cold occur after chemotherapy, it is necessary to consult a doctor in time to avoid delaying the condition.