Postherpetic neuralgia (PHN) is chronic nerve pain that persists in the area where a shingles rash occurred, lasting months or even years after the rash itself has healed. It develops in roughly 10% to 18% of people who get shingles, making it the most common complication of the disease. The pain results from lasting nerve damage caused by the same virus responsible for chickenpox.
How Shingles Leads to Lasting Nerve Pain
The varicella-zoster virus, which causes chickenpox in childhood, never fully leaves the body. It lies dormant in nerve cells near the spine and brain. Decades later, it can reactivate as shingles, producing a painful, blistering rash that typically appears in a band on one side of the body. In most people, the pain fades as the rash clears. In those who develop PHN, the virus has already done deeper damage to the nerves themselves.
During a shingles outbreak, the virus triggers intense inflammation along the affected nerve fibers. This inflammation destroys nerve endings in the skin and damages the insulating coating (myelin) around nerve fibers. People with PHN have significantly fewer nerve endings in the affected skin compared to people who recovered from shingles without lasting pain, and the greater the loss of nerve endings, the more severe the pain tends to be.
The damage also rewires how the spinal cord processes pain signals. Normally, the spinal cord filters incoming signals so that harmless sensations like a light touch don’t register as painful. After the nerve injury from shingles, pain-sensing neurons in the spinal cord become hyperexcitable. They form new connections with fibers that usually carry non-painful touch signals, essentially rerouting gentle touch into the pain pathway. Immune cells in the spinal cord amplify this process by releasing inflammatory molecules that keep pain signals firing long after the virus is gone. This combination of peripheral nerve destruction and central rewiring is why PHN can persist for years.
What PHN Feels Like
PHN pain occupies the same patch of skin where the shingles rash appeared, most commonly on one side of the torso, though it can affect the face or other areas. People describe it as burning, stabbing, sharp, or throbbing. The pain can be constant or come in waves, and it frequently worsens at night.
About half of PHN patients experience a phenomenon called allodynia, where normally painless contact triggers significant pain. A light brush of clothing, a bedsheet, or even a breeze across the skin can be excruciating. Others feel intense itching in the affected area alongside or instead of pain. The skin may also feel numb or tingling between pain episodes, a reflection of the nerve damage underneath.
Effects on Sleep, Mood, and Daily Life
PHN does more than cause pain. Sleep disturbance is one of the most common complaints, partly because neuropathic pain tends to intensify at night. Poor sleep and persistent pain feed each other in a cycle: pain disrupts sleep, and shortened or fragmented sleep lowers pain tolerance, making the next day’s pain feel worse. Over time, this cycle contributes to anxiety, depression, and a significant decline in physical function and quality of life. Simple activities like getting dressed, bathing, or being hugged can become sources of dread when even light touch causes pain.
Who Is Most at Risk
Age is the strongest predictor. People 60 and older face a substantially higher risk of developing PHN after shingles, and the risk continues to climb with each additional decade. Beyond age, several other factors increase the likelihood:
- Severe or widespread rash: A more extensive shingles outbreak raises PHN risk by about 53% compared to milder cases.
- Pain before the rash appears: Some people experience burning or tingling for days before blisters develop. This prodromal pain signals heavier nerve involvement.
- Weakened immune system: Immunosuppressive medications (used after organ transplants or for autoimmune conditions) roughly double the odds of PHN.
- Chronic health conditions: Diabetes, COPD, hypertension, chronic kidney disease, and cancer all independently raise the risk.
- Smoking and heavy alcohol use: Both are associated with higher PHN rates.
How PHN Is Treated
PHN treatment focuses on reducing pain to a manageable level and improving sleep and daily function. Complete pain elimination is not always possible, but most people experience meaningful relief with the right approach.
Oral Medications
The most commonly prescribed medications fall into two categories. Anticonvulsants originally developed for seizures, such as gabapentin and pregabalin, work by calming overactive nerve signals. Both are specifically approved for PHN. Doses are typically started low and increased gradually based on relief and side effects. Drowsiness and dizziness are common early on but often improve over time.
Certain older antidepressants (tricyclic antidepressants) are also used as first-line treatment, not for their mood effects but because they alter pain signaling in the spinal cord. For people with severe pain that doesn’t respond to these options, opioid medications may be considered, though they carry risks of dependence and are generally reserved for more refractory cases.
Topical Treatments
For people who prefer to avoid or supplement oral medications, topical options can help. Lidocaine patches applied directly to the painful area numb the skin and provide localized relief. High-concentration capsaicin patches, applied by a healthcare provider, work differently. They overwhelm and then desensitize the pain-sensing nerve endings in the skin. Studies show capsaicin patches can reduce pain scores by around 46%, and a single application can provide relief for weeks to months before needing to be repeated.
Prevention Through Vaccination
The most effective way to prevent PHN is to prevent shingles in the first place, or at least reduce its severity. The recombinant zoster vaccine (Shingrix) is 91% effective at preventing PHN in adults 50 and older, and 89% effective in those 70 and older, according to CDC data. It is given as two doses, two to six months apart. Even in people who still develop shingles after vaccination, the outbreak tends to be milder, which lowers the chance of nerve damage severe enough to cause PHN. The vaccine is recommended for adults 50 and older regardless of whether they remember having chickenpox, since over 99% of Americans born before 1980 carry the dormant virus.
How Long PHN Lasts
PHN follows no single timeline. Some people see their pain gradually fade over several months. Others live with it for years. The intensity often diminishes over time, even without treatment, but a subset of patients, particularly older adults with severe initial outbreaks, experience pain that persists indefinitely. Early and aggressive treatment of the initial shingles episode, including antiviral medications started within 72 hours of the rash, can reduce both the severity and duration of PHN, though it cannot guarantee prevention.