Adults 39 ℃ more than a night of fever, if you take a timely and effective way to reduce fever, there are no serious complications is fine; but if you do not take an effective way to reduce fever, resulting in the emergence of complications is something. Adults with high fever can use warm water to wipe the forehead, armpits, groin of the capillary-rich parts of the body, along with oral ibuprofen, acetaminophen and other antipyretics, through the above methods the body temperature may gradually return to normal in a few hours. 39 ℃ mostly belongs to high fever, persistent high fever is very harmful to the human body. Persistent high fever can lead to severe complications such as febrile convulsions and seizures; persistent high fever can cause irreversible damage to brain cells, which must be alerted and taken seriously. Fever need to go to the hospital, a clear diagnosis of the cause of the targeted treatment, and at the same time follow the doctor’s instructions to use antipyretic drugs to reduce body temperature, but not their own random use of drugs.