The duration of fever from viral infection depends on the type of virus and the severity of the infection. Generally, the fever caused by the common cold virus has a duration of one week, and this disease is self-limiting, requiring only symptomatic treatment and no special treatment, and it can be cured by itself. On the other hand, fever caused by influenza virus takes two weeks or even longer, the course of the disease is relatively long, and if necessary, it is necessary to choose anti-influenza virus drugs to shorten the course of the disease. In addition, the common cold has complications, such as otitis media, bronchitis, or even pneumonia, the fever may take more than two weeks or even longer, this time you need to timely symptomatic treatment and etiological treatment.