Why do you suddenly have a fever at night?

Sudden fever at night, may be caused by low immunity, there may be caused by cold. In addition, when the invasion of bacteria and viruses, causing upper respiratory tract infection, it will also cause fever. Pay attention to keep warm, give antibiotics, antiviral anti-infection treatment. At the same time, give physical cooling, if the temperature is too high, should be given antipyretic treatment in time.