The fact that a child has a fever that does not go away means that some of the causes of the fever are still persistent. The common causes are: 1. Some infectious factors constantly stimulate the thermoregulatory center to raise the body temperature, and some non-infectious factors, such as malignant tumors, may also cause the fever to stay away; 2. Some tuberculosis bacilli or some rheumatic immune system diseases may also cause the fever to stay away. First of all, when there is an infection, a large number of bacteria, viruses or other pathogenic microorganisms will grow and multiply in the body, constantly stimulating the thermoregulatory center; secondly, these microorganisms will also secrete a large number of toxins, which will also stimulate the thermoregulatory center, leading to the phenomenon of a fever that does not go away all the time. It is necessary to use appropriate antibiotics or antiviral drugs for targeted anti-inflammatory treatment according to the type of infection in order to relieve the fever that does not go away, such as bacterial infections, intravenous antibiotics can be injected.