When the body’s immunity is low (such as exertion, emotional changes, family changes, etc.), varicella zoster virus by latent in the sensory nerve root again, along the nerve invasion, resulting in nerve sheath damage, nerve inflammation. It is well known that nerves are used to make us move, feel sensations, etc. by conducting bioelectricity. When the nerve sheath is damaged, bioelectricity leaks out and causes pain, so herpes zoster pain is like electric shock sensation, burning sensation, and pins and needles sensation.