Influenza is usually referred to as flu, which is an infectious disease caused by influenza virus. Symptoms can be mild or severe, with high fever, runny nose, sore throat, muscle soreness, headache, cough and tiredness. Sometimes patients have symptoms of gastrointestinal discomfort. Coughs caused by the flu may last for more than two weeks. For patients with antiviral medication, the flu symptoms still cannot be significantly improved, and with a duration of more than two weeks, the treatment effect of traditional Chinese medicine is fast and significant.