There are more reasons for recurrent fever, such as viruses, bacterial infections, influenza, lung problems, post-surgery, etc. The reasons are as follows: 1. Bacterial and viral infections, recurrent fever caused by bacterial and viral infections is the most common and easier to control, as long as the cooling effect can be achieved through physical cooling methods, if it is a recurrent high fever that has not faded away, further examination is needed to clarify the cause. 2. Influenza, the symptoms of fever always do not go away, that is, it goes down and then continues to rise, repeatedly non-stop is the performance of the flu, the flu is a viral infection in the early stages, later will appear compound infection. 3. lung problems, lung infection will suffer from inflammation, thus triggering repeated high fever does not go away. 4. after surgery, if there is congenital heart disease, after surgery will also have the problem of repeated high fever. .