Symptoms of h3n2 influenza include systemic symptoms such as chills and fever, respiratory symptoms such as cough and sore throat, and digestive symptoms such as vomiting and diarrhea. h3n2 influenza is generally acute onset, patients can appear fever symptoms, most of the low fever, some patients can appear 39 ~ 40 ℃ high fever, accompanied by chills, extreme fatigue, muscle and joint pain, loss of appetite and other systemic symptoms, but also respiratory symptoms such as coughing, sore throat, nasal congestion, runny nose, etc., as well as digestive symptoms, such as diarrhea, vomiting and so on. Patients with mild cases of h3n2 influenza usually behave similarly to those with the common cold, but their fever and systemic symptoms are more pronounced. Severe cases may develop pneumonia, shock, acute respiratory distress syndrome and other complications, which may lead to death in severe cases. If the patient develops the symptoms of the above infection, he should consult a doctor in time to find out the cause of the disease and treat it under the doctor’s guidance, and should not take medication without authorization.