Flu fever generally lasts for 3-5 days.

Flu refers to the condition characterized by sore throat, cough, and fever after the human body is infected with the influenza virus. It is called influenza, which is a symptom that appears after a viral infection. In most cases, it is self-limiting, meaning it can be treated with or without medication. The fever from influenza generally lasts about 3-5 days, and usually, after five days, the body temperature begins to decrease, and even returns to normal. Around 7-10 days, the patient's condition can naturally be completely alleviated. Therefore, influenza is not a severe disease, and as long as medication is used properly, some cases might see the fever subside within 3-5 days.