Influenza B virus infection usually lasts for a natural course of about 1 week. After treatment, the duration of illness may be shortened and recovery may occur in about 5 days. After 3-5 days of influenza B illness, the body temperature gradually decreases and symptoms such as headache, body aches, fatigue, dry throat, loss of appetite, nausea, vomiting, and diarrhea are relieved. However, influenza B virus can cause cough and sputum symptoms, which are caused by the edema and inflammation of the bronchial mucosa, and the recovery of cough and sputum symptoms is relatively late, often after 1-2 weeks, and the recovery of physical strength is relatively slow. In the early stage of influenza B, you can drink more water and eat light food. If fever and weakness appear, you need to take absolute bed rest, reduce the opportunity to go out, take antiviral drugs, and also use the Chinese medicine preparation of Pancreatin, together with Neo-Control for treatment.