The causes of fever and cramps in children include the following: first, caused by children suffering from febrile convulsions. If a respiratory infection occurs, there is a sudden rise in body temperature in the early stages of fever in children, and this time causes convulsions, which are febrile convulsions. The convulsions are simple and rarely last more than five minutes, so the child can be given oxygen and clear the airway in time, and many of them will stop on their own. Second, the symptoms caused by children suffering from encephalitis. If a child has viral encephalitis or bacterial encephalitis, it can also cause fever, convulsions, and even the urge to sleep and violent vomiting. Children can be given timely treatment to lower intracranial pressure and anti-infection, such as the application of mannitol and cefotaxime.