Influenza is caused by a viral infection. Influenza is a contagious disease that is mainly transmitted through the respiratory tract. The preferred drug for the treatment of influenza is generally Oseltamivir phosphate, and a course of treatment is available for about 5 days, the earlier the treatment, the better, most patients will gradually relieve clinical symptoms after 48 hours of antiviral treatment. For influenza patients, especially children or the elderly need to be alert to the possibility of pneumonia, because pneumonia caused by influenza, some patients will be in critical condition, accompanied by respiratory failure and other manifestations. Therefore, once the diagnosis of influenza is clear, patients need to be treated as early as possible to prevent the emergence of related complications. The main clinical manifestations of influenza are fever, sore throat, cough, pain in the limbs and joints, and in some cases, diarrhea.