What Causes A Recurrence Of Fever Blisters?

Many factors weaken the body's defenses and trigger an outbreak of herpes. These include exposure to sunlight, emotional illness, fever and injury. Many women have recurrences only during menstruation. Studies indicates that susceptibility to herpes recurrences is inherited.

Research is under way to discover exactly how the triggering factors interact with the immune system and the virus to prompt a recurrence of fever blisters.