DEAR DOCTOR K: I've already had shingles. Do I still need to get a shingles vaccine?
DEAR READER: Shingles is caused by the same virus that causes chickenpox. Once you have had chickenpox, the skin changes of chickenpox go away, but the virus that caused it remains alive inside your nerves. It is inactive, but it can be reactivated later in life. This causes shingles.