The common influenza usually has no sequelae, but severe influenza may have sequelae if it is not treated in time and combined with a disease such as pneumonia. Influenza, also known as influenza, is caused by infection of the body with the influenza virus. Influenza is usually a self-limiting disease, and in most cases, it does not cause any harm to the body after it is cured, nor does it leave any after-effects. Prompt treatment is recommended for influenza, and antiviral drugs such as oseltamivir can be taken under medical supervision. People with severe influenza are susceptible to other serious illnesses such as pneumonia and bronchitis if left untreated, and these illnesses may leave sequelae such as pulmonary fibrosis and chronic tracheobronchitis. Therefore, people with influenza need to be treated in time, and there are usually no sequelae after the flu is cured without complications.