The most common causes of high fever in children include recurrent illness caused by viral infections, autoimmune diseases, tumors, or taking fever-reducing medications that do not meet the required dosage can also lead to high fever that does not go away. The most common cause of fever that does not go down is viral infection, as the baby’s body resistance is not fully developed and the adaptability to the external environment is weak, it is easy to get infected with viruses and cause the disease to recur and the fever does not go down. In this case, you should go to the pediatric clinic in time to find out the cause and treat the symptoms. Taking fever-reducing medicines without a certain amount may make fever reduction fail. When parents give medication to their children at home to reduce fever on their own, they need to take it according to the dosage as instructed by the doctor. In addition, fever-reducing medication can only help to lower the temperature rather than directly treating the condition, so it is also easy to have recurring fever after it has subsided. In addition to medication, physical therapy is also needed to help lower the temperature during a high fever. Children with high fever need to hydrate, drink water can take away the body heat, help detoxification, conducive to the improvement of the condition; give children a warm bath can also help to lower the temperature; reduce the child’s clothes, which is conducive to the body heat dissipation. Children with high fever as parents must be particularly anxious, parents should take the child to the doctor in time to find out why the child is sick, and to help the child to reduce the fever in time. If the child’s fever does not go down, it will cause serious bodily harm to the child.