Remember chicken pox also known as the Varicella zoster virus?If that virus getting reactivated in old age Shingles is what happens.According to the medical science these chicken pox virus stays sleeping or dormant in the nerve cells and during episodes of immune suppression weakness gets reactivated and starts giving you trouble.They characteristically have a burning sensation associated with skin lesions along the area of distribution of that nerve and make life difficult .It causes a dermatomal rash The regular painkillers don't work and prevention is the best policy .