Children’s immunity is generally not well developed, and they are susceptible to various pathogens, and influenza is a highly prevalent childhood disease. If the flu is not treated in time, it can easily lead to irreversible damage, we can determine whether it is the flu through the specific symptoms of the flu, as follows: First, fever. The fever of influenza is different from the fever of common cold, most of the fever of influenza is acute high fever, the temperature may reach about 38℃~40℃, accompanied by a cough and sore throat. If a child has a high fever and the fever does not go away, it should be brought to the attention of parents. Second, chills and convulsions. Influenza can cause the child to have a generalized fever, but the child itself will feel very cold and chilly. And accompanied by the phenomenon of convulsions. This is due to the increase of white blood cells in the body caused by high fever, and some serious flu patients, there will be fainting phenomenon. Third, body aches and pains. Aches and pains are usually caused by the sequelae of high fever. The high fever of influenza will spread all over the body, resulting in muscle tension and spasms all over the body, thus causing the phenomenon of body aches and pains. Finally, the appearance of influenza in children must attract the attention of parents, to go to the hospital in time to avoid secondary complications such as encephalitis, pneumonia, myocarditis.