Shingles (Herpes Zoster)
What is Shingles (Herpes Zoster)?
Shingles is a painful viral infection that causes a blistering rash on your skin. It happens when the varicella zoster virus, the same virus that causes chickenpox, wakes up after lying dormant in your nerve tissues for years or decades.
After you recover from chickenpox, the virus never truly leaves your body. It hides in nerve cells near your spinal cord and brain. When your immune system weakens due to age, stress, or illness, the virus can reactivate and travel along nerve pathways to your skin. This creates the characteristic painful rash that appears in a stripe or band pattern, usually on one side of your body.
About 1 in 3 people will develop shingles at some point in their lifetime. The risk increases significantly after age 50. While shingles is not life threatening for most people, it can cause severe pain and complications. The condition typically lasts 2 to 4 weeks, but some people experience nerve pain that continues for months or even years after the rash heals.
Symptoms
Shingles symptoms usually develop in stages and affect a specific area of your body:
- Pain, burning, numbness, or tingling in a specific area, often on one side of the body
- Red rash that appears a few days after the pain begins
- Fluid-filled blisters that break open and crust over
- Itching around the affected area
- Fever and chills
- Headache and fatigue
- Sensitivity to touch or light
- Muscle weakness in the affected area
The rash most commonly appears as a single stripe around the left or right side of your torso. It can also develop on your face, neck, or near one eye. Some people experience pain without developing a rash, which can make diagnosis more difficult.
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Causes and risk factors
Shingles is caused by the reactivation of the varicella zoster virus that stayed in your body after a chickenpox infection. Your immune system normally keeps this virus in check. When your immune defenses weaken, the virus can wake up and cause shingles. Only people who have had chickenpox or received the chickenpox vaccine can develop shingles.
Risk factors that increase your chances of developing shingles include being over age 50, having a weakened immune system from conditions like HIV or cancer, taking immunosuppressive medications, undergoing cancer treatments like chemotherapy or radiation, and experiencing high levels of physical or emotional stress. People who had chickenpox before age 1 also face higher risk. A previous case of shingles does not provide immunity, and you can get shingles more than once.
How it's diagnosed
Doctors usually diagnose shingles by examining your rash and asking about your symptoms. The distinctive pattern of blisters appearing in a stripe on one side of your body is often enough to confirm the diagnosis. Your doctor will also ask about pain that started before the rash appeared, which is a hallmark sign of shingles.
In unclear cases, your doctor may order specialized tests. A laboratory can test fluid from your blisters or take a blood sample to check for varicella zoster virus antibodies. Blood tests can show whether you have IgG antibodies against the virus, indicating past infection or recent reactivation. Talk to a healthcare provider about testing options if you suspect shingles. Early diagnosis within 72 hours of rash onset allows for more effective antiviral treatment.
Treatment options
Treatment focuses on reducing symptoms, speeding healing, and preventing complications:
- Antiviral medications like acyclovir, valacyclovir, or famciclovir to shorten the duration and severity of the infection
- Pain relievers including over-the-counter options or prescription medications for severe pain
- Cool compresses applied to blisters to reduce pain and itching
- Calamine lotion or colloidal oatmeal baths to soothe skin
- Topical capsaicin cream for nerve pain after the rash heals
- Anti-inflammatory medications to reduce swelling and discomfort
- Rest and stress reduction to support immune system recovery
- A nutrient-rich diet with adequate protein, vitamin C, vitamin D, and zinc to support healing
- Keeping the rash clean and covered to prevent bacterial infection
Antiviral medications work best when started within 72 hours of rash appearance. See a doctor immediately if you develop shingles near your eye, as this can threaten your vision. People over 50 or those with weakened immune systems should seek prompt medical care.
Frequently asked questions
No, you cannot get shingles unless you have had chickenpox or received the chickenpox vaccine. Shingles develops from the varicella zoster virus that remains dormant in your body after a chickenpox infection. However, you can catch chickenpox from someone with active shingles if you have never had chickenpox before.
A person with shingles can spread the varicella zoster virus to others who have never had chickenpox or the chickenpox vaccine. The virus spreads through direct contact with fluid from the shingles blisters, not through coughing or sneezing. Once the blisters crust over, you are no longer contagious. People who catch the virus from you will develop chickenpox, not shingles.
A typical shingles outbreak lasts 2 to 4 weeks from when the rash first appears until the blisters fully crust over and heal. Pain may begin a few days before the rash shows up. Some people develop postherpetic neuralgia, which is nerve pain that continues for months or years after the rash heals.
Yes, high levels of physical or emotional stress can trigger shingles by temporarily weakening your immune system. Stress hormones can reduce your body's ability to keep the dormant varicella zoster virus under control. Other triggers include illness, major surgery, certain medications, and aging, which naturally weakens immune function.
Postherpetic neuralgia is nerve pain that continues after a shingles rash heals. It happens when the virus damages nerve fibers, causing them to send confused pain signals to your brain. The pain can be burning, sharp, or aching and may last for months or years. This complication is more common in people over 60 and those who had severe rash or pain during the acute infection.
The shingles vaccine is the most effective way to prevent shingles and its complications. Two vaccines are available in the United States, with Shingrix being the preferred option for adults 50 and older. The vaccine reduces your risk of developing shingles by more than 90 percent. Maintaining a healthy immune system through good nutrition, stress management, adequate sleep, and regular exercise may also help.
See a doctor as soon as possible if you suspect shingles, ideally within 72 hours of the rash appearing. Antiviral medications are most effective when started early. Seek immediate medical care if the rash appears near your eye, you have a weakened immune system, the rash is widespread and painful, or you are over age 60.
Yes, you can get shingles more than once, though it is not common. About 1 in 20 people who have had shingles will experience a second outbreak. Your risk of recurrence increases if you have a weakened immune system or are over age 50. Getting the shingles vaccine can reduce your risk of future outbreaks.
The most common complication is postherpetic neuralgia, which causes lasting nerve pain. Shingles affecting your eye can lead to vision loss if untreated. Other complications include bacterial skin infections, facial paralysis or hearing loss if the virus affects facial nerves, and inflammation of the brain or spinal cord in rare cases. People with weakened immune systems face higher risk of complications.
Blood tests can detect varicella zoster virus antibodies, specifically IgG antibodies, which indicate past chickenpox infection or recent virus reactivation. Doctors primarily diagnose shingles based on the appearance of your rash and symptoms. Blood tests are helpful in unclear cases or when someone has symptoms but no visible rash. They can confirm whether you have been exposed to the virus and may suggest recent reactivation.