39.3 degrees is considered a high fever. A high fever is defined as a body temperature between 39.1℃ and 41℃. If the body temperature of 39.3 degrees, is considered a high fever state, may be bacteria, viruses, mycoplasma or rickettsiae and other pathogens caused by infection, should be as soon as possible with a professional doctor to improve the blood routine, C-reactive protein and other tests, to clarify the causes of induced fever, and timely take targeted therapeutic measures. For a fever of 39.3 degrees, should be under the guidance of a professional doctor for antipyretic treatment, commonly used antipyretic drugs such as ibuprofen, acetaminophen, etc., but also can use fever patches or wipe the body with a hot towel, etc., to physically cool down the temperature. If the fever is 39.3 degrees, it is recommended to go to the regular hospital as soon as possible for consultation and examination, timely and standardized treatment to speed up the speed of fever reduction. At the same time, also pay attention to drink more boiled water, to avoid high fever caused by the loss of body fluids, easy dehydration.