A fever of 38 degrees Celsius should be cooled physically by drinking warm water, taking a warm bath or even a hot shower, or by applying a fever-reducing patch. If you are not allergic to alcohol, you can also use alcohol baths, which can also take away the heat from the body to help cool it down. If you have a fever of 38℃ with a headache, and your body temperature does not drop after using physical cooling methods, you can also take ibuprofen, acetaminophen, or nimesulide orally to aid sweating and reduce fever. If the fever persists for more than 3 days, it is recommended to go to the hospital for routine blood tests.