Definition of Shingles:

Shingles (herpes zoster) is a painful, blistering skin rash due to the varicella-zoster virus, the virus that causes chickenpox.

See also: Ramsay Hunt syndrome

Causes, incidence, and risk factors:

After you get chickenpox, the virus remains inactive (becomes dormant) in certain nerves in the body. Shingles occurs after the virus becomes active again in these nerves years later.

The reason the virus suddenly become active again is not clear. Often only one attack occurs.

Shingles may develop in any age group, but you are more likely to develop the condition if:

• You are older than 60
• You had chickenpox before age 1
• Your immune system is weakened by medications or disease

If an adult or child has direct contact with the shingles rash on someone and has not had chickenpox as a child or a chickenpox vaccine, they can develop chickenpox, rather than shingles.