What is postherpetic neuralgia?

It is nerve pain that stays in the area where you had shingles, continuing after the rash heals. The shingles virus damages the nerve, which keeps sending pain signals even though the skin looks normal.

How can I lower my chance of getting it?

The two main ways are getting the shingles vaccine (available under Singapore’s National Adult Immunisation Schedule for eligible adults) and, if you do get shingles, starting antiviral tablets within about 72 hours of the rash appearing.

My shingles rash is near my eye — is that serious?

Yes, treat it as urgent. Shingles affecting the eye can threaten your sight, so see a doctor or eye specialist the same day, especially if you have eye pain, redness, blurred vision, or a rash on the tip of your nose.

Why hasn’t paracetamol helped my PHN?

PHN is nerve pain, which usually responds poorly to ordinary painkillers. Doctors instead use specific medicines such as certain antidepressants or anti-seizure drugs, and topical treatments like lidocaine plasters.

Will the pain go away?

For many people PHN gradually eases over weeks to months, but in some — particularly older adults — it can last longer. Treatment focuses on reducing the pain and helping you sleep and function while it settles.

Postherpetic Neuralgia in Singapore: Pain After Shingles

Written & reviewed by the BestDoctors.sg editorial team · Last updated 24 Aug 2026 · General information, not medical advice

Postherpetic neuralgia (PHN) is persistent nerve pain in the area where a shingles rash occurred, continuing after the rash has healed. It is the most common complication of shingles, usually defined as pain lasting more than about three months after the rash appears. Because shingles damages the affected sensory nerve, that nerve can keep firing abnormally — so PHN is a specific type of nerve pain, and ordinary painkillers often help little.

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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.

Shingles affecting the eye is an emergency for your sight — a rash on the forehead, around the eye or on the tip of the nose, with eye pain, redness or blurred vision, needs same-day eye assessment.

Why it happens and who is at risk

Shingles is a reactivation of the varicella-zoster (chickenpox) virus, which lies dormant in nerve roots for decades after chickenpox. When it reactivates, it inflames and damages a sensory nerve, and the resulting nerve damage can leave ongoing pain in the same band of skin even after the skin looks normal. Risk of PHN rises markedly with age (particularly from the 50s onward), and is higher after a severe rash or severe acute pain, with shingles on the face or eye, and in people whose immune system is weakened by illness or treatment. Delayed or no antiviral treatment of the acute shingles also raises the risk.

How it feels

The pain is localised to the previous rash area — commonly a band on one side of the trunk or chest, or on the face — and may be burning, aching, throbbing or sharp and electric. A characteristic feature is allodynia, where even light touch from clothing, bedsheets or wind is painful; itching or numbness may coexist. It can be constant or intermittent, is often worse at night, and may persist for months or, in some, years, significantly affecting sleep and mood.

Prevention

Two measures reduce the risk. The first is shingles vaccination — the recombinant (non-live) zoster vaccine is offered under Singapore’s National Adult Immunisation Schedule for adults aged 50 and above and for eligible immunocompromised adults, and it lowers the risk of both shingles and PHN; check current eligibility and subsidy with your doctor or HealthHub. The second is early antiviral treatment of shingles: starting antivirals ideally within 72 hours of the rash appearing can shorten the attack and reduce the risk and severity of PHN and eye complications. Good pain control during the acute shingles also helps.

How it is diagnosed and treated

PHN is usually a clinical diagnosis — a history of shingles in that area plus ongoing typical nerve pain in the same band of skin, with altered sensation but no fresh rash. A GP can diagnose and start treatment, referring severe or prolonged cases to a pain specialist, neurologist or dermatologist. Because PHN is neuropathic, paracetamol and anti-inflammatories usually give limited relief; first-line medicines are the same as for other nerve pain — amitriptyline, duloxetine, gabapentin or pregabalin, titrated gradually. Topical lidocaine plasters over the affected skin are particularly useful in PHN, as is capsaicin. Non-drug measures such as protecting the sensitive skin, good sleep and psychological support help with the impact of chronic pain.

Coping while the pain settles

Because postherpetic neuralgia can take months to ease, day-to-day coping strategies matter alongside medication. Protecting the sensitive skin often helps: loose, soft clothing over the affected area reduces the light-touch pain of allodynia, and some people find a lidocaine plaster, once prescribed, both eases pain and shields the skin. Good sleep is worth prioritising, since pain and poor sleep worsen each other, and gentle daily activity helps keep mood and function up while the nerve recovers. It is common for the pain to grind people down over weeks, and low mood or anxiety can amplify it, so relaxation techniques, staying socially connected and, where needed, psychological support are a legitimate part of care. Setting realistic expectations helps too: rather than waiting for the pain to vanish before resuming normal life, most people do better by gradually returning to activities as comfort allows, using their treatment to make that possible. Keeping a simple note of what eases or worsens the pain lets you and your doctor fine-tune the medicines, which are usually adjusted gradually to balance benefit against side effects such as drowsiness. If one medicine does not suit you, it is worth telling your doctor, as there are several options and switching is common.

When to see a doctor

Go promptly — ideally within 72 hours — at the first sign of a new shingles rash (a painful, blistering, one-sided band), especially if you are 50 or older or immunocompromised, so antivirals can be started. Seek same-day care if shingles involves the eye, forehead or tip of the nose or affects vision. And if pain persists after the rash has healed, or is severe or disrupting sleep and daily life, see your GP for nerve-pain treatment. Realistically, PHN often eases slowly over months and many people recover, though in some — especially older adults — it can be long-lasting.

Sources

HealthHub (Singapore) — Herpes Zoster (Shingles): healthhub.sg
SingHealth / HealthXchange — From Shingles to Post-Herpetic Neuralgia: healthxchange.sg
NHS — Shingles: nhs.uk
Cleveland Clinic — Shingles in the Eye (Herpes Zoster Ophthalmicus): clevelandclinic.org

General information only. This guide is general information about a pain condition or treatment and is not a diagnosis or personalised medical advice. See a doctor — a GP or a pain specialist — for assessment and a treatment plan. Seek urgent care for pain after a major injury, a fever with severe pain, new leg weakness or numbness, or loss of bladder or bowel control (possible nerve compression). Call 995 for signs of an opioid overdose — excessive drowsiness, very slow or shallow breathing, or a person who cannot be roused.

Postherpetic Neuralgia in Singapore: Nerve Pain After Shingles