The natural course of influenza B is about 1 week, and it can recover on its own even without treatment, and after treatment, the course will be shortened to about 3-5 days. Influenza B is caused by influenza B virus infection, and its symptoms, in addition to those of the common cold, are mainly characterized by a rapid onset of symptoms such as chills and chills, and a rapid rise in body temperature to about 39℃-40℃ within a few hours to a day of onset, accompanied by nausea and vomiting, abdominal pain and distension, dizziness and headache, panic and chest tightness, and other systemic damage. In case of high fever above 39℃, aggressive antipyretic treatment is needed to avoid complications. Oseltamivir is a specific treatment for influenza. You can also take Chinese medicines such as Shuanghuanglian and Lianhua Qingpu capsule to clear the heat and detoxify the toxin. In the early stage of influenza B, you should drink more water and eat light food. When fever and malaise symptoms appear, you should absolutely rest in bed, reduce going out to avoid cross-infection, prohibit spicy and stimulating food, and ensure sufficient diet and nutrition to help early recovery.