How long a headache lasts after a fever is mainly related to the severity of the patient’s condition and individual circumstances. It usually gets better in about 1 week, but the exact time varies from person to person. Usually, colds are often accompanied by high fever, dizziness, and body aches and pains. For most patients, the temperature will return to normal in about 1 week and the headache will be relieved. However, in some patients, the headache may remain unrelieved after a cold because the inflammation in the body has not been completely cleared. In addition, if headache symptoms persist for a long time, more causes of headache should be considered, such as elevated blood pressure, meningitis, and encephalitis. Therefore, it is recommended to check the blood pressure condition to rule out hypertension, and even cerebrospinal fluid and cranial CT/MRI to rule out meningitis and encephalitis. In addition, during fever, patients need to take more rest, avoid exertion, drink more hot water and eat more vegetables rich in dietary fiber.