When a patient has fever, it is best to drink warm water because it is good for replenishing the water lost due to fever, and it can replenish blood volume and promote blood circulation, which is good for heat dissipation. It can also increase the amount of urine, so that heat can be discharged from the urine, which can help to relieve the symptoms of fever, and drinking warm water can help to expand the capillaries, which can promote the body to dissipate heat. It is best not to drink too cold water during a fever, because the stomach and intestines are weak during a fever, and drinking too cold water will stimulate the gastrointestinal mucosa of the patient, which may lead to gastrointestinal discomfort. In addition to drinking warm water during fever, patients should also keep the air in the room circulating, which will also have a positive effect on the relief of fever symptoms.