Viral Infections
Some of the viral infections can also trigger the occurrence of alopecia areata.
Influenza: It is a viral infection in which there is excessive production of interferons(IFN). The interferons (IFN) are the primary attackers of the immune system.
Hay fever: Hay fever being causes an allergic reaction in the body, thus compromising the immune system of a person. Hay fever can trigger the condition of alopecia areata by causing the immune cells to attack the healthy hair follicles.