Influenza is a self-limiting disease that usually leaves no sequelae after recovery. If influenza is combined with pneumonia, there is a possibility of sequelae such as interstitial lung fibrosis. Influenza, usually referred to as the common flu, is a respiratory disease caused by infection with the influenza virus, which can be transmitted to others, mainly through respiratory droplet transmission. Clinical symptoms such as dry cough, headache, fever and depression may occur after infection with influenza virus. Usually, the symptoms will gradually improve or disappear about 2 weeks after infection and 7 days after the onset of the disease, in which case there is usually no after-effects. If the infection is severe, the symptoms of pneumonia may appear, and then it is necessary to carry out standardized treatment in a timely manner to prevent sequelae such as pulmonary fibrosis. After suffering from influenza, you need to consult a doctor in a timely manner and carry out isolation and treatment under the guidance of a physician.