Herpes Zoster (Shingles) is the adult reoccurrence of the chicken pox virus caused by reactivation of the Varicella-Zoster virus (VZV). The virus affects one or more nerve roots, sometimes involving the eye on one side. It is common and has serious consequences, notably post-herpetic neuralgia or pain.
The reason the virus suddenly becomes active again is not clear. Often only one attack occurs. Shingles may develop in any age group, but you are more likely to develop the condition if:
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You are older than 60
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You had chickenpox before age 1
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Your immune system is weakened by medications or disease