Shingles (Herpes Zoster): Symptoms, Causes, and Treatment — Symptoms, Causes & Treatment

Shingles (herpes zoster) is a painful rash caused by the reactivation of the chickenpox virus. It typically affects one side of the body and can lead to severe nerve pain. Early treatment with antiviral medication is crucial to reduce symptom severity and prevent long-term complications like postherpetic neuralgia.

Early symptoms

• Localized pain, burning, tingling, or itching
• Headache
• Fever and chills
• General feeling of unwellness (malaise)
• Red rash that begins a few days after the pain
• Fluid-filled blisters that break open and crust over

Severe symptoms — seek medical care

• Severe, debilitating pain
• Vision loss or eye pain (Herpes Zoster Ophthalmicus)
• Facial paralysis or drooping (Ramsay Hunt Syndrome)
• Hearing loss or dizziness
• Confusion or memory loss
• Rash that spreads to multiple parts of the body (Disseminated Zoster)

Common causes

• Reactivation of the Varicella-Zoster Virus (VZV)
• Age-related decline in immunity
• Immunosuppressive medications (e.g., steroids, chemotherapy)
• Underlying medical conditions (e.g., HIV/AIDS, cancer)
• Significant psychological or physical stress

Frequently Asked Questions

Can shingles be cured?

Shingles cannot be cured, but it can be effectively treated to resolve the acute illness. The varicella-zoster virus that causes shingles remains dormant in your body for life after you've had chickenpox. The goal of shingles treatment is to manage the active infection, not to eliminate the virus from your body. Antiviral medications like valacyclovir can shorten the duration of the rash, reduce pain, and significantly lower your risk of long-term complications [2]. For most healthy individuals, the rash and pain will resolve within 3 to 5 weeks with proper treatment. The focus is on managing symptoms and preventing chronic issues like postherpetic neuralgia.

Is shingles contagious?

A person with shingles cannot give shingles to someone else. However, a person with an active shingles rash can spread the varicella-zoster virus (VZV) to someone who has never had chickenpox or the chickenpox vaccine. In this case, the exposed person would develop chickenpox, not shingles. The virus is spread through direct contact with fluid from the shingles blisters [4]. It is not contagious before the blisters appear or after they have crusted over. To prevent spreading the virus, keep the rash covered, avoid touching or scratching it, and wash your hands frequently until the rash has fully scabbed.

How can I prevent shingles?

The most effective way to prevent shingles is through vaccination. The CDC recommends the recombinant zoster vaccine (RZV), sold under the brand name Shingrix, for adults 50 years and older [4]. Shingrix is also recommended for adults 19 years and older who have a weakened immune system. The vaccine is given in two doses, 2 to 6 months apart, and is more than 90% effective at preventing shingles and its most common complication, postherpetic neuralgia (PHN) [1]. Even if you have already had shingles, the vaccine can help prevent future occurrences. Maintaining a healthy lifestyle with a balanced diet, regular exercise, and stress management may also support your immune system.

What is postherpetic neuralgia (PHN)?

Postherpetic neuralgia (PHN) is the most common complication of shingles, characterized by persistent nerve pain that lasts for three months or more after the rash has healed. The shingles virus damages nerve fibers, causing them to send confused and exaggerated pain signals to the brain. The pain can range from mild to excruciating and is often described as burning, stabbing, or throbbing. The risk of developing PHN increases with age; it is uncommon in people under 40 but affects up to a third of untreated patients over 60 [3]. Early treatment of shingles with antiviral medication can reduce the risk of developing PHN.

How long does shingles last?

For most people, a shingles episode lasts between 3 to 5 weeks. The first phase (prodrome) involves pain or tingling for 1-5 days before the rash appears. The second phase is the active rash, where blisters form and last for 7-10 days before they dry up and crust over. The third phase is healing, where the scabs fall off over the next 1-2 weeks. Pain typically subsides as the rash heals. However, for some individuals, the nerve pain can persist for months or even years after the rash is gone, a condition known as postherpetic neuralgia (PHN) [2]. Seeking prompt medical care can shorten the overall duration of the illness.

Can I work or exercise with shingles?

Whether you can work or exercise depends on the severity of your symptoms and the nature of your job. If you feel generally unwell, have a fever, or are in significant pain, it is best to rest. If your job involves physical activity or contact with people (especially children, pregnant women, or immunocompromised individuals), you should stay home until your blisters have crusted over to avoid spreading the virus [4]. Light exercise like walking may be possible if you feel up to it, but you should avoid activities that cause sweating or friction against the rash. Always listen to your body and consult your doctor for personalized advice.

What foods should I eat or avoid with shingles?

There is no specific 'shingles diet,' but focusing on immune-boosting foods can support your body's healing process. Eat a balanced diet rich in vitamins A, B12, C, and E, and the amino acid lysine. Good choices include fruits, vegetables, lean protein, and whole grains. Some people believe that foods high in the amino acid arginine (like chocolate, nuts, and seeds) could potentially trigger the virus, though scientific evidence for this is weak. The most important dietary consideration is to eat nutritious, whole foods to support your immune system and to stay well-hydrated, especially while taking antiviral medications [2].

How do I know if my shingles treatment is working?

You will know your treatment is working when you see signs of healing and symptom improvement. Key indicators include the cessation of new blister formation, which usually happens within a few days of starting antiviral medication. Existing blisters will begin to dry up, flatten, and form scabs. The pain and itching should also gradually decrease, although some level of discomfort may persist for a few weeks. If your pain worsens, new blisters continue to appear after a week of treatment, or you develop a fever or other concerning symptoms, you should contact your doctor as it may indicate a complication or an inadequate response to treatment.

Educational information only. Always consult a qualified healthcare professional for diagnosis or treatment.