Causes and Risk Factors
After a chickenpox infection, the virus never fully leaves the body; it lies dormant in nerve roots and can reawaken decades later:- Aging immune system: Immunity to the virus gradually declines with age, which is why most cases occur in adults over 50.
- Weakened immunity: Cancers such as lymphoma, chemotherapy, long-term steroid use, and organ-transplant medications all increase risk.
- Physical stress or illness: A serious illness, surgery, or period of intense stress can precede an outbreak.
Symptoms
Shingles typically follows a predictable course over two to four weeks:- Early warning: Burning, tingling, itching, or stabbing pain in a band of skin on one side of the body, often days before anything is visible.
- Rash: Red patches that become fluid-filled blisters in a stripe on one side of the chest, back, abdomen, or face, crusting over in seven to ten days.
- Flu-like symptoms: Fever, headache, chills, fatigue, and sensitivity to light may accompany the rash.
- Pain that varies widely: For some people the rash is mildly itchy; for others even light clothing brushing the skin is intensely painful, and the severity of pain does not always match how the rash looks.
- Eye involvement: A rash on the forehead, nose, or around the eye can inflame structures inside the eye, similar to iritis, and threaten vision — this needs urgent evaluation.
Treatment
Starting treatment quickly — ideally within 72 hours of the rash appearing — shortens the illness and reduces complications:- Antiviral medications: Valacyclovir, acyclovir, or famciclovir speed healing and lessen the severity of pain.
- Pain control: Over-the-counter pain relievers, cool compresses, and calamine lotion help mild pain; nerve-pain medications such as gabapentin may be added for more severe pain.
- Skin care: Keep the rash clean and loosely covered. Until the blisters crust over, the fluid can transmit chickenpox to people who have never had it or been vaccinated against it.
- Rest and recovery: Adequate rest, fluids, and loose, breathable clothing over the rash keep irritation down while the skin heals over the following weeks.
Complications
Most people recover fully, but complications become more common with age:- Post-herpetic neuralgia: Nerve pain that persists for months or longer after the rash heals — the most common complication. Learn more about post-herpetic neuralgia.
- Vision problems: Untreated shingles near the eye can cause lasting damage, including vision loss.
- Skin infection: Scratched or open blisters can develop secondary bacterial infection.
- Widespread disease: In people with weakened immune systems, the rash can spread beyond a single band and, rarely, affect internal organs — a situation that requires hospital care.
Getting Through Shingles
How much shingles hurts, and for how long afterward, depends heavily on decisions made in the first few days: whether an antiviral is started, how the pain is treated, and whether the eye or ear is involved.
The antiviral, and the 72-hour rule's exceptions
Valacyclovir is usually chosen over acyclovir because it is taken three times a day rather than five, and famciclovir is equivalent. The three-day window is not absolute: treatment is still started later when new blisters are still forming, when the face, eye, or ear is involved, or when the immune system is weakened. Doses are reduced in chronic kidney disease, and drinking plenty of water protects the kidneys during the course.
Treating the pain from day one
Waiting to see whether the pain fades is the most common mistake, because uncontrolled pain in the first weeks predicts post-herpetic neuralgia. Scheduled acetaminophen or an NSAID such as ibuprofen handles mild pain; burning, electric, or clothing-triggered pain calls for gabapentin or pregabalin started early and increased stepwise, and a lidocaine patch once the skin has healed. Opioids are limited to a few days for severe pain. Cool compresses and loose cotton clothing help in the Florida heat, where sweat under tight fabric aggravates the rash; our pain management without opioids article covers the nerve-pain options.
Contagion and daily life
Shingles cannot be caught, but the blister fluid can give chickenpox to anyone who has never had it or the vaccine, so the rash is kept covered until every blister has crusted, and contact with pregnant women, newborns, and people on chemotherapy is avoided in the meantime. With the rash covered, most people can work; swimming, the beach, and shared hot tubs wait until the skin has healed. A second bacterial infection is suggested by spreading redness, warmth, or pus.
Face, eye, ear: the same-day situations
A rash on the forehead, eyelid, or tip of the nose can involve the eye, causing iritis, corneal scarring, or glaucoma, and needs an ophthalmologist the same day. Ear pain with blisters in the ear canal, hearing loss, dizziness, or facial weakness resembling Bell's palsy is Ramsay Hunt syndrome and is treated urgently. A rash crossing the midline or scattered widely, or shingles in someone with lymphoma or on immunosuppressants, needs hospital-level treatment. The weeks after shingles also carry a small rise in stroke risk, which is a reason to keep blood pressure and cholesterol treatment current.
The vaccine, before and after an episode
The recombinant vaccine is two doses two to six months apart, for everyone 50 and older and for immunocompromised adults from 19, including people who had the older live vaccine or a previous episode of shingles. After an episode, vaccination proceeds once the rash has healed and the acute illness has settled. Our shingles guide and adult vaccine checklist cover timing, and our neurologic team manages persistent nerve pain. The National Institute on Aging and NINDS publish patient guidance.
If you have a new one-sided painful rash, or you are over 50 and have not had both doses of the shingles vaccine, schedule a visit.