When headache and fever caused by gastroenteritis, it can be treated by physical cooling, drinking more water and medication. 1. Physical hypothermia: When gastroenteritis patients have headache and fever, generally when the temperature is within 38 degrees Celsius, physical hypothermia can be used to control the fever. If the temperature does not come down for a long time, you need to seek medical treatment. 2. Drink more water: in the fever, will lead to fluid loss, generally through the appropriate amount of water, is conducive to the metabolism, so as to achieve the purpose of alleviating the fever. 3. medication: when patients with gastroenteritis have a headache and fever, they can use levofloxacin tablets, norfloxacin capsules and other medications under the guidance of a doctor for treatment. Once patients with gastroenteritis have a headache and fever, it is recommended to go to the hospital in time for relevant examinations to clarify the cause of the disease, and then take the cause of the treatment.