The main clinical symptoms of influenza are characterized by high fever, fatigue, headache, generalized aches and pains, and other heavy systemic toxic symptoms, while respiratory symptoms are mild. Influenza is an acute respiratory disease caused by influenza virus and belongs to category C infectious disease. Influenza viruses are prone to mutation, highly infectious and have a high incidence rate. Influenza is generally characterized by acute onset, prodromal weakness, high fever (up to 39 ℃ ~ 40 ℃), chills, headache, muscle joint pain and other symptoms of systemic toxicity, accompanied by runny nose, sore throat, dry cough, facial flushing, conjunctival congestion and other local symptoms. In the period of high incidence of influenza, it is important to strengthen personal protection, such as wearing masks, washing hands regularly, opening windows and ventilating rooms, not gathering and not partying. Thus, completely cut off the transmission pathway and effectively prevent influenza virus infection. Get vaccinated against influenza in time before the flu season. When flu symptoms appear, first go to the doctor in time, after the doctor’s examination, after a clear diagnosis, follow the doctor’s advice isolation, treatment.