Influenza B belongs to a kind of influenza, and patients will mostly have some of the following symptoms: 1. Weakness: Patients with influenza will have obvious symptoms of weakness and feel weak easily. The longer the onset of the disease, the stronger the feeling of weakness, the whole person has no spirit; 2, dizziness and brain swelling: the influenza virus can cause symptoms such as paroxysmal headache and persistent brain swelling; 3, acute hyperthermia: because of the rapid onset of the influenza virus, mostly acute hyperthermia, hyperthermia does not subside, the body temperature can reach a peak within a few hours or even 24 hours, reaching 39 ℃ – 40 ℃, or even higher; 4, breathing difficulties: Influenza virus can directly infect the respiratory tract, and inflammation of the upper respiratory tract can also directly lead to symptoms such as difficulty in breathing; 5. Other symptoms: for example, after the virus acts on the respiratory tract, there can be dry throat, sore throat, dry cough and other respiratory symptoms. Viral infection of the upper respiratory tract can also directly lead to dyspnea. In addition, there can be flushing, bulbar conjunctival congestion and edema, pharyngeal congestion, and follicles can appear in the soft palate.