If you can’t find out the cause of low fever for more than ten days, you need to pay attention to not messing around with medicines, recording temperature as well as symptoms, and accepting relevant examinations. 1. Don’t use medicines indiscriminately: It is recommended not to use medicines indiscriminately, especially antibiotics, antipyretics and all kinds of traditional Chinese medicines, so as not to cover up the condition. 2. Record body temperature and symptoms: It is recommended to monitor the body temperature 3 times a day, and record the temperature and accompanying symptoms for the doctor’s judgment. 3. Undergo various tests: It is recommended to undergo a series of tests, such as CT examination of the lungs, various blood tests, such as liver function tests, renal function tests, biochemical tests, immune index tests, tumor marker tests, etc. If necessary, it is also necessary to undergo an abdominal examination. If necessary, it is also necessary to receive abdominal ultrasound, cardiac ultrasound, male prostate as well as female gynecological examination, gastroenteroscopy and so on. In addition, more than ten days of low fever check out, there may be some underlying diseases caused by the patient is recommended to receive timely examination and treatment in regular hospitals.