A low-grade fever that does not go away is most often caused by an upper respiratory tract infection that is not effectively controlled or by a low immune system, resulting in a reinfection of the virus. Very few patients have chronic wasting diseases, such as tuberculosis and lung tumor occupancy. If the fever is caused by upper respiratory tract infection, you can take anti-cold drugs such as Benoxate dispersible tablets, Mei Gui Pseudo Ma capsule, compound aminophenalkylamine tablets, which can treat and relieve the fever symptoms caused by common cold and influenza. It can be combined with Chinese medicines, such as Blue Scutellaria Oral Liquid and Shuang Huang Lian Oral Liquid, which can clear damp heat in the lung and stomach. If the low fever is caused by pulmonary tuberculosis, it is recommended to go to a regular specialized hospital for consultation and treatment, and anti-tuberculosis drugs are usually given for symptomatic treatment. If the low fever is caused by lung tumor, early surgery is recommended, and radiotherapy is recommended for those without surgical indications. Low fever caused by tumor can be treated by Chinese medicine, which can help to eliminate the evil and strengthen the capital and improve the quality of life.