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Herpes zoster, also known as shingles or zoster, is a viral infection caused by the same virus that causes chicken pox. Anyone who's had chicken pox can develop herpes zoster. The virus remains dormant or inactive in certain nerve root cells of the body and only when it reactivates does zoster occur. About 20 percent of those people who have had chicken pox will get zoster at sometime during their lives. Fortunately, most people will get zoster only once. It is not clear what prompts the virus to reactivate or "awaken" in healthy people. A temporary weakness in immunity (the body's ability to fight infection) may allow the virus to multiply and move along nerve fibers toward the skin. Although children can get zoster, it is more common in people over the age 50. Illness, trauma and stress may also trigger a zoster attack. People with a weakened immunity...

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