I. From Chickenpox to Shingles: A "Viral Resurgence" That Can Span Decades

1. One virus, two distinct diseases
Many people do not realize that shingles and chickenpox are caused by the same pathogen—the varicella‑zoster virus. When a person contracts chickenpox in childhood, the illness resolves, but the virus is not completely eliminated. Instead, it quietly takes up residence in the body’s nerve ganglia—primarily the dorsal root ganglia and cranial nerve ganglia—entering a dormant state. This latency can last for decades or even a lifetime.

When the immune system weakens—due to aging, excessive fatigue, chronic illnesses, or use of immunosuppressive agents—the latent virus reactivates. It replicates vigorously along sensory nerve fibers and spreads to the corresponding skin areas, triggering shingles. This is why shingles is called a "virus assassin that lurks for a lifetime"—it hides in the body for years, waiting for the immune system to let its guard down before striking.

2. Global epidemiology of shingles
Shingles is a worldwide health concern. Statistics show that the global annual incidence of shingles in the general population is approximately 3–5 per 1,000 person‑years, and in the Asia‑Pacific region, it is about 3–10 per 1,000 person‑years. In China, a national survey covering nearly 28,000 individuals reported an annual incidence of roughly 5.85 cases per 1,000 people.

Shingles can occur at any age, but its incidence rises sharply with age. Among people aged 80 and older, the incidence can reach 5%–10%. It is estimated that about 10%–20% of the global population will experience shingles at some point in their lives. As the population ages, the incidence of shingles continues to trend upward.

II. Postherpetic Neuralgia (PHN): A More "Troublesome" Complication Than the Rash Itself

1. What is postherpetic neuralgia?
Postherpetic neuralgia (PHN) is defined as neuropathic pain that persists for more than one month after the shingles rash has healed. It is the most common and most severe complication of shingles.

There is a fundamental difference between acute‑phase pain and PHN. Acute pain results from both inflammatory irritation and nerve injury, whereas PHN arises from intrinsic dysfunction of the nervous system. The former is "the skin crying out in pain," while the latter is "the nerve itself malfunctioning."

In medical terms, shingles‑associated pain is viewed as a continuum—a dynamic evolution from the nerve inflammation that precedes the rash, through the nociceptive pain during the rash, to the neuropathic pain after healing, without a clear‑cut boundary between stages.

2. Incidence: How many people are affected?
The occurrence rate of PHN varies depending on the definition used in studies. Meta‑analysis data indicate that about 9%–34% of shingles patients develop PHN. A cross‑sectional study conducted across 24 hospitals in 7 Chinese cities found a PHN rate of 29.8% among shingles patients. According to data from the People’s Medical Clinical Assistant, approximately 20% of shingles patients experience residual neuralgia.

This means that roughly one in every three to five shingles patients may progress to PHN.

Even more concerning is the protracted course. In some patients, pain can persist for 1 to 2 years; without effective control, the overall duration often exceeds 3 years, and in individual cases, it may last more than 10 years. About 30%–50% of patients suffer from pain lasting over a year. Such long‑term, intense pain not only ravages the body but also severely impacts mood, sleep, and overall quality of life.

III. Who Are the High‑Risk Groups? – The "Targets" of Postherpetic Neuralgia

1. Age: The single most important risk factor
Age is the most significant risk factor for PHN. Among shingles patients aged 60 and above, about 65% develop PHN; among those aged 70 and above, the figure reaches 75%. People over 50 experience a marked increase in risk, and by age 70, the incidence can be as high as 24.34%. This means that for every four elderly individuals who get shingles, one may have to endure this stubborn, long‑term pain.

In the 65+ age group, the PHN rate is approximately five times that of younger populations, with age 80 representing a clear threshold. Among PHN sufferers, those aged 60 and older account for up to 82.7%.

Why are the elderly at such high risk? On one hand, immune function naturally declines with age, making viral reactivation easier; on the other hand, nerve repair capacity diminishes with age, making it harder for damaged nerves to return to normal.

2. Other risk factors
In addition to age, the following factors significantly increase the risk of PHN:

• Immunocompromised status: patients with cancer, autoimmune diseases, diabetes, or those using immunosuppressive agents.

• Severity of herpes: patients with severe acute pain and extensive skin lesions are at higher risk.

• Timing of treatment: failure to initiate standard antiviral therapy within 72 hours of rash onset markedly increases risk.

• Affected site: herpes involving the trigeminal nerve distribution (especially the ophthalmic branch), the perineal region, or the brachial plexus area is more prone to PHN.

• Comorbidities: chronic conditions such as diabetes, chronic kidney disease, and cardiovascular disease increase risk.

3. Head and face: the most challenging site
Shingles is most commonly found on the chest and back (about 55%), followed by the head and face (about 15%), the abdomen and lower back (about 14%), and the neck (about 12%).

PHN in the head and facial region is particularly problematic because of the dense nerve network—the trigeminal, facial, and occipital nerves interlace intricately. Trigeminal nerve (especially the ophthalmic division) involvement is one of the most complex and challenging types of PHN. Patients may experience excruciating pain triggered by combing hair, wearing a mask, or even a breeze on the face.

According to the Chinese Guidelines for the Whole‑Course Management of Shingles‑Associated Pain (2025 Edition), ophthalmic shingles can be accompanied by severe headache and various ocular complications, while auricular shingles can trigger Ramsay‑Hunt syndrome. These special types not only cause intense pain but may also affect critical functions such as vision and hearing.

IV. A Public Health Concern That Cannot Be Overlooked

PHN is globally recognized as one of the most challenging pain disorders. It is estimated that there are approximately 4 million PHN patients in China. With the accelerating aging of the population, this number continues to rise.

Patients suffer from relentless severe pain, leading to low mood, significantly reduced quality of life, and often a drastic decline or total loss of work and social capacity. Some patients, unable to bear the pain, may even develop suicidal thoughts.

Faced with this serious health challenge, early risk identification, timely and standardized treatment, and scientific pain management are essential issues that every shingles patient and their family members need to take seriously.

Qingdao Tiantian Traditional Chinese Medicine Clinic’s Five‑linked Anti‑drug Pain Therapy is a comprehensive external treatment approach using traditional Chinese medicine, specifically designed for shingles and postherpetic neuralgia. It offers a professional TCM‑based external option for patients suffering from head‑and‑face shingles and related neuralgia. If you or your loved ones are troubled by such pain, we recommend consulting a licensed medical institution for evaluation and treatment under the guidance of qualified practitioners.

The therapeutic rationale is "toxin‑removal and pain‑relief"—that is, through specialized techniques, it aims to clear the "viral toxins" retained in the deep layers of the skin that persistently stimulate nerves, thereby facilitating nerve repair and alleviating pain. The entire procedure is performed by qualified medical staff in a professional healthcare setting.

Indications
This therapy is mainly applicable to the following conditions:

• Herpes zoster (shingles)

• Postherpetic neuralgia

• Postherpetic neuralgia without rash (zoster sine herpete)

• Trigeminal neuralgia

For shingles‑associated PHN occurring on the head and face, the therapy also provides corresponding treatment protocols. Based on extensive clinical experience, for most patients without serious underlying diseases and who strictly adhere to the contraindication instructions along with their families, significant improvement or gradual pain resolution is generally observed within 3 to 8 sessions. Treatment outcomes vary from person to person and are influenced by individual differences, disease duration, underlying health conditions, and other factors.

Disclaimer:
This content is a summary of clinical experience and observations from TianDao Traditional Chinese Medicine over many years. It is intended for patient education, public awareness, and scientific exchange. It does not constitute a guarantee of cure, safety, or efficacy for any condition, nor is it a promotional promise.