If you’ve had chickenpox in the past, you have to varicella-zoster within your body. Shingles is a viral infection caused by the varicella-zoster virus.
Now why don’t you have chickenpox right now or why don’t you have any symptoms of this viral infection within you?
It’s because the virus has gone to sleep; it’s dormant inside the nervous tissue of your body. And usually if you are a healthy individual, the virus doesn’t do anything.
But then in cases when you aren’t feeling very well and your immune system is lower. The virus can reactivate and begin to irritate the nerve cells that it has slept in.
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