What is shingles, and what are its symptoms?
Shingles (herpes zoster) is a viral infection caused by the reactivation of the varicella-zoster virus (VZV), the same virus that causes chickenpox. After a primary infection with chickenpox (usually during childhood), the virus remains dormant in the sensory nerve ganglia and can reactivate decades later, most often when specific anti-VZV immunity weakens.
Characteristic symptoms:
- Prodromal phase (1 to 5 days): pain, tingling, burning, and hypersensitivity in a specific area of the skin (metameric region, or dermatome), sometimes accompanied by a moderate fever and general malaise.
- Eruptive phase: appearance of red patches followed by vesicles clustered in bunches on an erythematous background, strictly limited to a metameric area (most often unilateral, not crossing the midline).
- Course of the disease: The vesicles become cloudy (3 to 5 days), form scabs (7 to 10 days), and then fall off (2 to 3 weeks).
- Common locations: thoracic, lumbar, and cervical regions; and, especially in older adults, ophthalmic shingles (trigeminal nerve territory).
The pain is often **intense** and neuropathic in nature (burning, electric shocks, hypersensitivity to touch).
What causes the reactivation of the shingles virus?
Reactivation occurs when specific immunity against VZV weakens. Several factors are recognized:
- Advanced age (incidence rises sharply after age 50, and particularly after age 65).
- Immunosuppression: chemotherapy, immunosuppressive treatments (long-term corticosteroids, biologics, transplantation), HIV/AIDS, blood disorders.
- Significant or prolonged stress.
- Severe fatigue, overexertion.
- Certain intercurrent infections.
- More rarely, local trauma or radiation exposure in the affected dermatome.
Reactivation at a young age or recurrent episodes should prompt an investigation into an underlying cause of immunosuppression (medical evaluation).
Is shingles contagious?
Shingles is not as highly contagious as chickenpox, but some precautions are necessary:
- The fluid in the blisters contains the varicella-zoster virus; direct contact with the blisters of a person with shingles can transmit the virus to an unimmunized person, who will then develop chickenpox (not shingles).
- Once scabs have formed (usually 7 to 10 days after the rash appears), the risk of transmission is very low.
- Shingles is not transmitted through the respiratory tract (unlike chickenpox).
- Cover the lesions, practice good hand hygiene, and avoid close contact with:
- unimmunized pregnant women,
- infants under 12 months of age,
- immunocompromised individuals,
until the scabs have fully formed.
What are the treatments for shingles?
Treatment involves several approaches, all of which require a doctor’s prescription:
- Oral antivirals (acyclovir, valacyclovir, famciclovir): treatment should begin within 72 hours of the rash appearing to be fully effective. They reduce the intensity and duration of the rash and lower the risk of postherpetic neuralgia. After 72 hours, their benefit is debated depending on the clinical situation (immunosuppression, extensive lesions, ophthalmic shingles).
- Pain relievers: WHO-recommended dosing steps tailored to the intensity of the pain. Neuropathic pain is often inadequately relieved by conventional pain relievers. Gabapentinoids (gabapentin, pregabalin) or low-dose tricyclic antidepressants (amitriptyline) may be prescribed, especially in cases of postherpetic neuralgia.
- Local care: Gentle cleansing with water and mild soap, followed by thorough drying. A mild topical antiseptic may be prescribed if a secondary infection is present. Capsaicin creams or 5% lidocaine patches may be prescribed for residual neuropathic pain.
- Oralantihistamines: may alleviate associated itching, without treating the viral cause.
- Hospitalization or specialist consultation is indicated in cases of ophthalmic shingles, disseminated shingles, shingles in an immunocompromised patient, or complicated shingles (motor nerve damage, encephalitis, etc.).
Self-prescribing antiviral medications is not recommended: only a prompt medical consultation allows treatment to be initiated within the optimal therapeutic window.
Can shingles be prevented with a vaccine?
Yes, a vaccine is available. In France, the Haute Autorité de Santé (HAS) recommends the adjuvanted recombinant shingles vaccine (Shingrix), administered in two doses:
- For adults **65 years of age and older** (HAS recommendation).
- In certain immunocompromised adults aged 18 and older, according to defined criteria (chemotherapy, organ transplantation, certain hematological conditions).
This vaccine has gradually replaced the live-attenuated vaccine (Zostavax), which is now used less frequently. It has demonstrated high and long-lasting efficacy in preventing shingles and postherpetic neuralgia. Common side effects: local reaction at the injection site, mild fever, and fatigue lasting a few days. Vaccination should be discussed with your primary care physician based on your individual profile.
What are the possible complications of shingles?
Several complications can occur during the course of shingles:
- Postherpetic neuralgia (PHN): neuropathic pain persisting for more than 3 months after the skin has healed. This is the most common complication, and the risk increases significantly with age (up to 30% of people over 60). It can last from months to years, with a significant impact on quality of life.
- Ophthalmic shingles (V1 territory, ophthalmic branch of the trigeminal nerve): an ophthalmologic emergency. Risk of corneal damage, uveitis, glaucoma, or even blindness. Suggestive sign: vesicles on the wing of the nose (Hutchinson’s sign, involvement of the nasociliary nerve).
- Bacterial superinfection of the lesions (staphylococcus, streptococcus): should be suspected in cases of extensive redness, purulent oozing, and fever.
- Auricular shingles (Ramsay-Hunt syndrome): associated peripheral facial paralysis and hearing loss.
- Disseminated or visceralshingles: primarily in immunocompromised individuals; more extensive involvement, sometimes affecting the lungs, liver, or nervous system.
- Rareneurological complications: encephalitis, meningitis, myelitis, ischemic stroke (herpes zoster vasculitis, especially following ophthalmic shingles).
Can shingles recur?
Recurrence is possible but remains rare in immunocompetent individuals. Recurrences occur more frequently in immunocompromised individuals. In cases of multiple recurrences or shingles at a young age, a medical evaluation is recommended to investigate any underlying cause of immunosuppression. Vaccination can help reduce the risk of recurrence and the severity of any potential reactivation.
What steps can you take to manage shingles at home?
In addition to medical treatment, several simple steps can help make the episode more bearable:
- Keep the area clean and dry: wash with water and mild soap, then pat dry without rubbing.
- Apply cool compresses (lukewarm, not ice-cold water) to relieve pain and itching.
- Wear loose-fitting clothing made of natural fibers (cotton) to minimize friction.
- Do not scratch or pop the blisters (risk of secondary infection and scarring).
- Practice strict hand hygiene after care; do not share linens or towels.
- Get adequate rest and sufficient sleep.
- A balanced diet and regular hydration to support the immune system.
- Minimize sources of stress and fatigue.
When should you see a doctor for shingles?
A medical consultation is essential as soon as the first symptoms appear to begin antiviral treatment promptly (ideally within 72 hours). An **urgent** consultation or specialist evaluation is required in several situations:
- Shingles on the face, particularly around or near the eye (ophthalmic shingles)—seek urgent ophthalmological evaluation.
- Shingles affecting the ear with facial paralysis, hearing loss, or dizziness (Ramsay-Hunt syndrome).
- Extensive rash, extending beyond a single dermatome, or suggesting dissemination.
- Immunocompromised individuals (chemotherapy, transplantation, biologic therapy, HIV).
- Pregnant women (consultation required).
- Infants or children.
- Signs of secondary infection (extensive redness, pus, fever).
- Neurological involvement: severe headache, confusion, motor or sensory disturbances.
- Intense pain not controlled by first-line analgesics.
If in doubt, call 15 (Samu) or 112 for emergency assistance.
What natural remedies can relieve shingles?
Complementary approaches are not intended to replace antiviral medical treatment, which is the priority within the first 72 hours:
- Cool compresses (local anesthetic effect).
- Warm colloidal oatmeal baths for 10 to 15 minutes to soothe the skin, on non-oozing lesions.
- Aloe vera and honey applied directly to shingles blisters: use with caution. The blisters contain active virus; these topical applications may promote maceration and bacterial superinfection. It is best to stick to medically approved local treatments.
- Support for the immune system: a varied diet, adequate sleep, vitamin C, zinc, and vitamin D as needed.
- Stress management techniques (cardiac coherence, meditation, sophrology) as a complementary measure.
Discuss any complementary approaches with your doctor to ensure compatibility with your current treatment.
How can shingles be distinguished from other skin conditions?
The diagnosis of shingles is primarily clinical. Several factors help identify it:
- Strictly **unilateral** distribution within a specific metameric area (dermatome).
- Blisters clustered in groups on an erythematous base, progressing to scabs.
- Typical neuropathic pain preceding or accompanying the rash.
- History of chickenpox (usually during childhood).
Possible differential diagnoses:
- Herpes simplex: oral or genital herpes, recurrent vesicular lesions, generally more localized.
- Contact dermatitis: more diffuse, triggered by an external agent.
- Psoriasis, seborrheic dermatitis: scaly plaques, different distribution.
- Impetigo: honey-colored crusts, widespread, contagious.
- Dermatitis herpetiformis: intense itching, symmetrical distribution.
- Acute allergic reaction.
If in doubt, consult a doctor for an accurate diagnosis.
Who is at higher risk for shingles?
Several groups are at increased risk:
- Adults **over 50**, particularly those over 65 (incidence is rising sharply).
- People who have previously had chickenpox (nearly the entire adult population in France).
- People with compromised immune systems: those undergoing chemotherapy, taking immunosuppressive medications (biotherapies, long-term corticosteroid therapy), organ transplant recipients, allogeneic stem cell transplant recipients, people with HIV/AIDS, and those with certain blood disorders.
- People on treatments that modulate the immune system (long-term corticosteroids).
- Significant chronic stress, prolonged fatigue.
- Poorly controlled chronic diseases (diabetes, severe COPD).
Can stress trigger shingles?
Yes, significant or prolonged stress can promote reactivation of the virus through its effect on cellular immunity. Severe fatigue, overwork, lack of sleep, and difficult life events (bereavement, trauma, surgery) have been associated with an increased risk. Stress management (physical activity, sleep, cardiac coherence, meditation, sophrology, and psychological counseling if needed) helps maintain overall immunity.
Can you go swimming with shingles?
Bathing is still possible and recommended for local hygiene, with a few precautions:
- A brief shower with lukewarm (not hot) water rather than a prolonged bath, which can cause the lesions to soften.
- Use mild, fragrance-free soap or syndet.
- Gently pat dry without rubbing.
- Avoid bubble baths and irritating products.
- Cover the lesions before prolonged contact with non-immune people.
- Avoid public swimming pools, hot tubs, and steam rooms until scabs have fully formed (transmission is possible through direct contact or water).
What is the connection between diet and shingles?
No specific diet “treats” shingles, but a balanced diet supports overall immunity:
- A variety of fruits and vegetables (vitamin C, carotenoids, polyphenols).
- Sources of protein (legumes, eggs, fish, lean meats).
- Omega-3s (fatty fish, nuts, flaxseeds).
- Zinc (seafood, meats, nuts), vitamin D based on your status (blood test).
- Regular hydration and sufficient rest.
- Limit added sugars, ultra-processed foods, and alcohol, which can promote a pro-inflammatory environment.
No routine supplementation is warranted. Medical advice allows for individualized recommendations based on specific needs, particularly for older adults or those with compromised immune systems.
