Whether Influenza A will leave after-effects is related to whether timely treatment is received and the health condition of the patient. If the patient is in good health and receives timely treatment, there will usually be no after-effects, but if he/she does not receive timely treatment or his/her health condition is poor, there may be after-effects. Influenza A has a relatively rapid onset and a short duration of illness. After timely and effective treatment, lightweight patients can usually get their condition under control without complications or after-effects. However, if the patient suffers from a variety of underlying diseases, such as diabetes, hypertension, etc., and does not receive timely and effective treatment or the disease is severe, it is easy to cause lung inflammation, asthma, acute respiratory distress syndrome, etc., and even after the disease is cured, it will still have a certain impact on the patient’s lung function. Therefore, patients suffering from influenza A should follow the doctor’s instructions in time to avoid delaying their condition.