A body temperature of 39.5 degrees is not an abnormal temperature. If it is normal, this thermometer reading must be wrong. So when the body temperature rises to such a high level, it is important to look for the cause and do the corresponding treatment. Because of this temperature, there will be obvious discomfort in the body, usually accompanied by obvious headache and muscle pain all over the body, some people will have more obvious back pain, some people will have pain in the bones and joints all over the body, even a slight movement of the joints can be felt, and some people will also have obvious nausea and vomiting. So this is the time to do symptomatic treatment, you can take oral antipyretics or apply other methods to bring down the body temperature to normal before you can relieve the accompanying symptoms. In addition, the patient may also have symptoms suggestive of etiology, such as fever caused by acute infection, and there may be coughing and coughing of sputum, suggestive of pneumonia. There may be frequent, urgent and painful urination, suggesting urinary tract infection. Therefore, the cause should also be found and treated based on the appropriate symptoms and ancillary tests.