A disease that occurs when the same virus that causes chicken pox becomes active again. After a person has chicken pox, the virus stays in the body. It may not cause problems for many years. As a person gets older, the virus may come back as shingles. It can cause mild to severe pain, usually on one side of the body or face. Unlike chicken pox, you can’t catch shingles from someone who has it. A vaccine can prevent shingles or lessen its effects. The vaccine is for people 60 and older.