Influenza B is an acute respiratory infectious disease caused by influenza B virus infection. Common symptoms include respiratory symptoms, systemic symptoms and gastrointestinal symptoms. 1. Respiratory symptoms: runny nose, watery eyes, sneezing, sore throat, coughing, difficulty in breathing, etc. 2. Systemic symptoms: most of them will cause chills, fever, body temperature above 39 degrees, muscle aches, weakness, fatigue, poor mental status, etc. 3. Gastrointestinal symptoms: some people will also have loss of appetite, nausea, vomiting, diarrhea and other manifestations. Influenza B should drink a lot of water, more rest can generally be recovered within a week, you can take antiviral drugs and detoxification drugs, the best time to take antiviral is within 48 hours of the appearance of symptoms. The best time to take antiviral drugs is within 48 hours of the onset of symptoms. The best time to take antiviral drugs is within 48 hours of the onset of symptoms, and the best time to take antiviral drugs is within 48 hours of the onset of symptoms.