Low fever is the main symptom of novel coronavirus pneumonia, but the diagnosis of novel coronavirus infection should not be based on one manifestation of low fever alone. It can be caused by a variety of infectious and non-infectious factors, including bacteria, viruses, rickettsia, mycoplasma, chlamydia, and fungal and parasitic infections. To diagnose novel coronavirus pneumonia, it is crucial to consider several aspects: 1. medical history, whether contact with patients or virus carriers; 2. exclude the influence of colds or other diseases; 3. if other diseases are excluded, the fever should be promptly tested by a physician at each regional fever clinic.