Hi Johnee
Welcome to NeuroTalk

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Shingles is caused by the virus (VZV) which causes chickenpox. VZV can remain dormant in the body after having caused chickenpox but (for reasons which are not well-understood) can get reactivated.
Treatments include getting vaccinated against VZV, pain relief and antiviral medication such as aciclovir or valaciclovir.
Best wishes.