Children’s fever does not go away for three days, the common causes are in the process of disease, improper treatment, etc., as follows: First, the child is in the process of disease: is the course of the disease is not to, in the course of the disease or during the treatment period, the course of the disease has not yet reached the extent of the cure, there will be three days of fever does not go away, but the disease is also in the gradual improvement of the state. According to the temperature, parents give timely and reasonable antipyretic treatment, at the same time during the disease, pay attention to light diet, pay attention to rest, more conducive to the recovery of the disease to normal. Second, improper treatment: not for the cause of treatment, for example, when the child’s fever is due to bacterial infection caused by acute tonsillitis, but parents do not apply antibiotics, no application of bacteria-specific drugs for treatment, but a separate application of antiviral drugs, that is, the treatment is not appropriate, the treatment method is wrong, and does not address the cause of the disease, there will be a child’s fever for three days. The child’s fever does not go down for three days. Therefore, when a child’s fever does not go away for three days or worsens, it is best to take the child to the hospital for a further detailed examination, or to take a follow-up examination, so that the clinician can diagnose the appropriateness of the current treatment, and adjust the treatment plan if necessary.