Influenza usually causes upper respiratory tract infection and digestive tract symptoms, and in severe cases, it can lead to pneumonia, acute respiratory distress syndrome and even shock. When the human body is infected with influenza virus, it attacks the epithelial cells of the respiratory tract, causing an immune response and symptoms of upper respiratory tract infection, such as sore throat, nasal congestion, runny nose, accompanied by systemic symptoms such as fever, fatigue, etc., and may be accompanied by some digestive symptoms, such as abdominal pain, diarrhea and vomiting, etc. In severe cases, pneumonia, acute respiratory distress syndrome, shock, etc., can occur. In severe cases, pneumonia, acute respiratory distress syndrome, and shock may occur, and in more severe cases, the condition may be life-threatening. After infection with influenza virus, can be given within 48 hours of the onset of antiviral drugs such as oseltamivir treatment, other antipyretic drugs, cough expectorant drugs symptomatic treatment, pay attention to ensure that rest, the majority of people in one or two weeks after the slow recovery. Most people will recover in a week or two. If the disease is more serious, it is necessary to go to the hospital in time for treatment.