Pneumonia has been a low fever does not go down if the untreated person should be early use of anti-infective drugs, such as taking active anti-infective treatment is still a low fever does not go down, need to change the drug and so on. 1. Untreated: Pneumonia is usually caused by bacteria, mycoplasma and other infections, manifested as fever, cough, and even asthma and other symptoms. Pneumonia has been low fever does not go away is the condition has not been effectively controlled, the need for early use of antibiotic treatment to control the condition, bacterial infection, should be given to cephalosporins and other antibiotics. Mycoplasma infection can be given azithromycin. 2. after active treatment: active anti-infection still low fever does not go away, need to consider antibiotic resistance, should improve the sputum culture, according to the results of drug sensitivity to choose sensitive antibiotics. At the same time, it is also necessary to exclude whether there is a combination of tuberculosis, fungi, viruses and other infections. In addition, it is also necessary to exclude whether there are other diseases that cause low fever, such as tuberculosis, immune system diseases, lung cancer and so on. If you have pneumonia and the fever does not go away, you should consult a doctor as soon as possible and standardize the treatment under the doctor’s guidance to avoid aggravating the condition.