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What is Shingles?

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Updated May 01, 2012

Written or reviewed by a board-certified physician. See About.com's Medical Review Board.

Shingles, or herpes zoster, is an infection that is caused by the same virus as chicken pox. Having a decreased immune system as a result of your leukemia or lymphoma, or the treatment of it, puts you at a much higher risk of developing this infection.

Where Do Shingles Come From?

If you have had chicken pox in the past, or if you were vaccinated for it, the virus never completely leaves your system. Even long after the itchy rash and infection are gone, the virus lays in a dormant or resting state in the spinal nerve cells of our bodies. The symptoms of the virus disappear, and are kept in check by our healthy immune systems.

In some cases, the virus can be reactivated as shingles.

Who Is At Risk of Developing Shingles?

If you have never had chicken pox or been vaccinated for it, you are off the hook.

The risk of developing shingles is much higher in older people. In fact, the chances of the virus becoming reactivated doubles every 10 years over the age of 50.

People with a lowered immune system are also at high risk for developing shingles. When your immune system lets down its guard, the virus takes the opportunity to become active again.

If you have a blood or marrow cancer, such as lymphoma or leukemia, there are a number of factors that put you at risk for decreased immunity:

  • Your cancer itself
  • Chemotherapy
  • Radiation therapy to an area of your body with a high percentage of active bone marrow, such as the pelvis
  • Steroid therapy
  • Bone marrow or stem cell transplant

What are the Symptoms of Shingles?

The active shingles virus follows along the nerve where it was dormant. Most often, it presents itself in a band on one side of the body. Shingles is commonly on the torso, but can occur anywhere, including your face and extremities.

The first symptom that you may experience is pain, itching, burning or tingling along the nerve and the skin surrounding it. In some cases, this may be the only symptom you have.

Most people will go on to develop a rash within the next 1-5 days. The skin over the affected nerve will look red and inflamed, and there will be a blistery, itchy rash -- like chicken pox. Each blister will stay for about a week to 10 days before drying up and turning a crusty yellow.

You may also experience flu-like symptoms (fever, fatigue, headaches) while you have the rash.

Are Shingles Contagious?

Until the shingles lesions are dried up, it is possible for you to transmit chicken pox to someone who has never had it before. Healthy people who have already had chicken pox are not at risk of a repeat infection. But, you should certainly avoid being in contact with others who have a lowered immunity, the very old and the very young, those who have never had chicken pox, and pregnant women.

Diagnosing Shingles

Most doctors can identify shingles just by looking at the rash and hearing your history. In some cases, people with decreased immune systems can have unusual distribution patterns to their rash, and your doctor may choose to send a swab for testing to be sure.

Treatment of Shingles

The goal of shingles treatment is to speed healing and keep the patient comfortable. The use of antiviral medications, such as acyclovir, famiciclovir, and valacyclovir, will not kill the virus but will help shorten the length of time until the rash heals and decrease pain symptoms.

Antivirals are usually given orally, but intravenous medications may be necessary in very serious cases or in special circumstances. In order to be the most effective, antiviral therapies should be started within the first 72 hours that symptoms are present.

Pain control is also important in the treatment of shingles. Over-the-counter medications, such as acetaminophen and ibuprofen, are usually sufficient to treat shingles pain, but in some severe situations, steroids, antidepressants and anticonvulsant medications may be used to enhance pain management.

Because you have a lowered immune system, you are also at risk of developing an infection from the open sores on your skin. This can be made even worse if you indulge in scratching. It is important for you to keep the area clean. Cool, wet compresses may help, and can be applied frequently throughout the day for 20 minutes at a time.

Complications of Shingles

Usually, a shingles outbreak lasts for a few weeks and the effects are self-limiting. However, it is possible to develop further complications. Some of these include:

  • Scars on the skin
  • Secondary infections from the open lesions
  • Ramsay Hunt syndrome, which includes facial paralysis and loss of hearing
  • Disseminated infection, in which the disease affects more than one side of the body. In this instance, the rash and symptoms will be very severe and may lead to pneumonia or liver and brain infection
  • Zoster opthalmicus, in which the nerves of the eye are involved. This can lead to blindness
  • Postherpetic neuralgia, in which the nerves become damaged by the virus. This will cause the patient to continue to have pain, even after the other signs of infection are long gone

If you think you might have shingles, contact your healthcare provider as soon as possible. Getting started on appropriate therapy in a timely manner greatly reduces your risk of long-term complications from shingles.

Summing it Up

Blood and marrow cancers like leukemia or lymphoma, as well as their treatment, can commonly cause a lowered immune system. Among other things, this decreased ability for your body to fight infection places you at an increased risk for developing shingles.

It is possible for shingles to cause long-lasting complications. The likelihood of these complications is decreased when therapy is initiated within the first 72 hours of the appearance of symptoms. Being aware of the warning signs of shingles and contacting your healthcare team right away can help make the course of your infection easier.

Sources:

Kelvin, J., Tyson, L. (2005). Questions and Answers About Cancer Symptoms and Cancer Treatment Side Effects. Jones and Bartlett: Sudbury, MA.

Marrs, J. Rash: Is it Shingles? Clinical Journal of Oncology Nursing August, 2006. 10: 463-464.

Sandy, M. Herpes Zoster: Medical and Nursing Management. Clinical Journal of Oncology Nursing August 2005. 9: 443- 445.

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