Shingles, a painful nerve condition, is caused by the virus that causes chickenpox.

It is the same virus that causes chickenpox and the nervous system disease shingles.

Although shingles isn't contagious, the virus can spread to others and can cause chickenpox.

Shingles occurs when the virus that causes chickenpox starts up again in your body.

The varicella-zoster virus is responsible for causing chickenpox and shingles.

Pneumonia also can be caused by viruses, such as those that cause the flu and chickenpox (varicella).

Under normal circumstances, the body can fight off these viruses - including the ones that cause herpes and chickenpox - with little effort.

It also causes chickenpox and the nervous system disease shingles.

There are lots of viruses; for example, one kind causes chickenpox, another mumps and other colds.

Shingles is caused by the same virus that causes chickenpox.