Herpes zoster, commonly called shingles, is an infection caused by the same virus that causes chickenpox. Only people who have had chicken pox can get shingles.
After a patient recovers from the chicken pox, the virus remains inactive in the body. Shingles develops when the virus becomes active again. People over the age of 50, or those with weakened immune systems due to diseases such as HIV or cancer, are at the highest risk for developing shingles.
Shingles usually appears as a painful rash, typically on only one side of the body. The rash generally lasts from one to fourteen days. However, some patients with shingles may develop postherpetic neuralgia (PHN), a condition in which the pain from shingles continues months or years after the rash has faded. To see more on our website click here .
The Center for Disease Control (CDC) recommends that people 60 years old and older get the shingles vaccine to prevent shingles and PHN. For more information about the vaccine visit the CDC’s website. READ MORE 
Source: Centers for Disease Control and Prevention