How Do You Get Shingles? Causes, Risks, and Treatment

If you had chickenpox as a kid, you probably thought that virus was behind you. But the varicella‑zoster virus doesn’t leave your body — it hides in your nerves and can wake up decades later as shingles.

Annual U.S. shingles cases: Approximately 1 million ·
Lifetime risk of developing shingles: About 1 in 3 people ·
Most common age group for shingles: 50 years and older ·
Window for effective antiviral treatment: Within 72 hours of rash onset

Four key facts about shingles, one pattern: the virus responsible, the typical duration, the share of adults affected, and the most common complication all point to a disease that is both widespread and can have lasting consequences.

What causes a person to get shingles?

How does the varicella‑zoster virus reactivate?

• After a chickenpox infection, the varicella‑zoster virus (VZV) retreats to nerve tissues near the spinal cord and stays dormant (Mayo Clinic (medical publisher)).
• When the immune system weakens — due to aging, stress, illness, or immunosuppressive medications — the virus can reactivate and travel along nerve fibers to the skin (CDC (U.S. public health agency)).
• This reactivation produces the painful blistering rash known as shingles (Healthdirect Australia (government health service)).

Can you get shingles from someone with chickenpox?

• No — you cannot catch shingles directly from a person who has chickenpox or shingles. Shingles is an internal reactivation of a virus you already carry (NHS patient leaflet (U.K. health authority)).
• However, a person with active shingles can transmit VZV to someone who has never had chickenpox or the chickenpox vaccine, potentially causing chickenpox (MedlinePlus (NIH resource)).
• Transmission requires direct contact with the fluid from shingles blisters — not airborne droplets (Mayo Clinic).

The implication: understanding the difference between shingles and chickenpox transmission is crucial for protecting both yourself and others.

How do you get shingles in adults?

What increases the risk of shingles in adults?

• Age is the strongest risk factor — the immune system’s ability to keep VZV dormant declines with age (CDC).
• Adults with weakened immune systems — from conditions like HIV, cancer, or from medications such as steroids or chemotherapy — face higher risk (CDC).
• Physical or emotional stress can trigger reactivation, though the exact mechanism isn’t fully understood (Tees Esk and Wear Valleys NHS Foundation Trust (U.K. health trust)).

Why is shingles more common after age 50?

• About 1 in 3 people will develop shingles in their lifetime, and the risk climbs sharply after 50 (CDC).
• Nearly all adults over 40 carry the virus from childhood chickenpox, and decades of immune slow‑down make reactivation more likely (Mayo Clinic).
• The CDC recommends routine vaccination for everyone 50 and older because the immune system is less able to suppress the virus (CDC vaccine considerations).

The trade-off: the same virus that gave you a mild rash in childhood can cause a painful, blistering outbreak decades later — and age is the biggest amplifier.

What are the very first signs of shingles?

What does a shingles rash look like?

• Before the rash appears, the most common early signs are pain, burning, numbness, or tingling in a localized area — often on one side of the torso or face (Mayo Clinic).
• The rash typically forms a strip of fluid‑filled blisters that follow a nerve path, usually only on one side of the body (CDC).
• Some people also experience fever, headache, or fatigue before or during the rash (Healthdirect Australia).

Where does the rash usually appear?

• The most common location is the torso, but it can appear on the face, neck, or around the eye (Mayo Clinic).
• Rash on the face, especially near the eye, can lead to vision loss if not treated promptly (CDC).
• The blisters gradually crust over and heal over 2–4 weeks (Hawaii Department of Health).

The pattern: early recognition matters — the window for effective antiviral treatment is narrow, and the first symptoms can be easy to miss.

What is the quickest way to get rid of shingles?

What antiviral medications are used?

• Three antiviral drugs are standard: acyclovir, valacyclovir, and famciclovir (CDC).
• These medications work best when started within 72 hours of the rash appearing; they reduce the severity and duration of the illness (Mayo Clinic).
• Pain relievers, cool compresses, and calamine lotion can help soothe symptoms (MedlinePlus).

When should treatment be started for best results?

• Antiviral therapy is most effective within the first 72 hours after the rash appears (CDC).
• Even after 72 hours, treatment may still help if new blisters are forming, but the benefit is reduced (Mayo Clinic).
• Early treatment also lowers the risk of postherpetic neuralgia, the most common complication (CDC).

What this means: speed is the single most important factor in treatment — each hour counts.

Is it safe to be around someone with shingles?

How long is someone with shingles contagious?

• A person with shingles is contagious from the time the first blister appears until all blisters have crusted over — usually about 7 days (NHS patient leaflet).
• Before the rash appears and after it crusts, the person is not contagious (CDC).
• The virus spreads through direct contact with fluid from the blisters, not through coughing or sneezing (Healthdirect Australia).

Can you get shingles from someone with shingles?

• No — you cannot get shingles itself from someone else. Shingles is a reactivation of your own virus (NHS leaflet).
• But a person with active shingles can transmit VZV to someone who has never had chickenpox or the vaccine; that person could then develop chickenpox (MedlinePlus).
• Keeping the rash covered with clothing or a bandage reduces the risk of transmission significantly (MedlinePlus).

Why this matters: the risk is not to you (you can’t catch shingles), but to those around you who may not be immune to chickenpox.

Is shingles dangerous?

What are the most common complications?

• Postherpetic neuralgia (PHN) is the most frequent complication — nerve pain that persists for months or even years after the rash heals (CDC).
• If shingles affects the eye, it can cause vision loss (CDC).
• Other complications include bacterial skin infections, neurological problems (such as encephalitis or facial paralysis), and hearing problems (Mayo Clinic).

Who is at highest risk for severe shingles?

• Older adults, especially those over 70, are more likely to suffer severe pain and complications (CDC).
• People with weakened immune systems — from cancer, HIV, organ transplants, or immunosuppressive drugs — are at higher risk for severe disease and prolonged symptoms (CDC).
• Shingles itself is rarely fatal, but complications like pneumonia or encephalitis can be life‑threatening in vulnerable individuals (Mayo Clinic).

The pattern: the danger of shingles is not the rash itself but the long‑term nerve damage and the increased risk for those with weaker immune systems.

“Shingles is a painful rash illness that occurs when the varicella‑zoster virus reactivates. The virus stays in your body after you have chickenpox, and it can reactivate years later.”

CDC official page on shingles

“Anyone who has had chickenpox can develop shingles. The virus is not spread through the air — it requires direct contact with the fluid from the blisters.”

Mayo Clinic specialist

“Shingles is less contagious than chickenpox, but it can still be spread to someone who has never had chickenpox or the chickenpox vaccine.”

Hawaii Department of Health

For the American adult who had chickenpox as a child, the choice is clear: get vaccinated at age 50, or face a 1‑in‑3 chance of a painful, potentially complicated illness that could have been prevented.

Related reading: High RDW Blood Test: Causes, Symptoms, and When to Worry

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