Painful shingles explained
From the Medical News Today website

Shingles is an infection that results from the varicella-zoster virus. This is the same virus that causes chickenpox.
Shingles occurs when a person who has previously had chickenpox experiences a reactivation of the varicella-zoster virus.
Shingles pain and other symptoms typically develop in stages over the course of several weeks. These stages tend to have a somewhat predictable pattern and duration.
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