Persistent low fever is most commonly associated with inflammatory reactions in the body, such as respiratory diseases: upper respiratory tract infections, acute bronchitis, pneumonia, lung abscess and so on. At this time, we must pay attention to keep warm, avoid getting cold again, bed rest, to fluid or semi-fluid diet, such as vegetable porridge, lean meat porridge, fruit soup and so on. You can take symptomatic medicines to reduce fever, such as Chai Gui Fever-reducing Oral Liquid, Xiao Chai Hu Granules, Qing Kai Ling Granules and so on. Review the blood routine, take X-ray or CT of both lungs if necessary, and take respiratory secretions to do pathogen culture and drug sensitivity test, etc. to clarify the condition and cause of the disease. If it is caused by bacterial infection, antibiotics can be given, you can choose piperacillin, meloxicillin, cefamandole, clindamycin, levofloxacin and other drugs to treat.