The fastest and most effective way to reduce fever in adults with a fever of 39 degrees generally does not exist, and physical and medication cooling methods can be used to reduce fever depending on the degree of the condition. At the same time to find the cause of fever, etiological treatment. 1. Physical cooling: you can use a wet towel to apply cold compresses, placing the towel on the forehead area to apply cold compresses. You can also apply antipyretic patches or use warm water baths to cool down the body. 2. medication: fever is very common in the clinic, there will be muscle and joint pain, mental fatigue, dizziness, weakness, appetite, food loss and other symptoms. 39 degrees can be prescribed by the use of antipyretic and analgesic drugs, such as aspirin, celecoxib and other antipyretic drugs for treatment. After cooling down, we should pay attention to monitor the body temperature to avoid recurrent fever. Adults with a high fever of 39 degrees, it is still recommended to go to the hospital in time for targeted treatment to avoid serious consequences. Daily attention to drink more warm water, promote metabolism, try not to eat spicy stimulating food, can eat light and nutritious food.