Shingles: Symptoms, the 72-Hour Window and the Vaccination

First things first: the 72-hour window

If you suspect shingles, time matters. Antiviral medicines work best when started early, ideally within 72 hours of the rash appearing. They shorten the course, ease the symptoms and lower the risk of persistent nerve pain.

So the rule is: at the first signs, that is a burning, one-sided rash with blisters, see a doctor promptly. Even after the 72 hours, treatment can still make sense, for example when new blisters keep forming, the immune system is weakened or the shingles appears on the face.

What is shingles?

Shingles (medically herpes zoster) is caused by a reactivation of the varicella-zoster virus, the very virus that also causes chickenpox. After a chickenpox infection, the virus does not disappear completely but remains for life in the nerve ganglia. When the immune system weakens, for example with increasing age, it can become active again.

The virus then travels along a nerve to the skin and causes the typical rash there. Because one nerve usually supplies a particular area of skin, shingles often appears as a one-sided, belt-shaped band, hence the name.

Symptoms

Shingles often begins with odd sensations even before the rash. A typical sequence is:

• Warning signs: burning, tingling, itching or pain in a limited, usually one-sided area of skin, sometimes with a feeling of being run down. This phase can come a few days before the rash.
• Rash: in the same spot, reddened patches and grouped blisters form on top, typically one-sided and arranged in a band. More on this: Skin rash.
• Pain: the affected area can burn, stab or be very sensitive to touch.

The blisters dry out after a few days and crust over. The rash usually heals within two to four weeks. The pain, however, can last longer.

Cause and contagiousness

The trigger is always an earlier chickenpox infection. A reactivation is encouraged above all by a weaker immune system, for example through older age, strong stress, other illnesses or medicines that suppress the immune system.

Important about contagiousness: you do not catch shingles directly. But the virus from the blisters can pass to people who have never had chickenpox or are not vaccinated. They then develop chickenpox, not shingles. You are contagious as long as the blisters have not crusted over. So cover the rash and, during this time, avoid close contact with pregnant women without immunity, with newborns and with people who have a weakened immune system.

Treatment: antivirals and pain

Treatment has two goals: slow the virus and ease the pain.

Antivirals: they inhibit the virus from multiplying and work best when started early, ideally within 72 hours. Available agents include aciclovir, valaciclovir, famciclovir and brivudine. An important practical point: aciclovir has to be taken several times a day, newer agents less often. Taking it regularly is decisive for the effect. More on this: Aciclovir.

Pain therapy: in the acute phase, painkillers help. For stronger or nerve-related pain, targeted medicines are used (see the next section).

Skin care: keep the rash clean and dry, do not scratch and cover it loosely to avoid an additional bacterial infection.

Postherpetic neuralgia: when the pain stays

The most common late effect of shingles is postherpetic neuralgia. Here the nerve pain persists even though the rash has long since healed, often for months. The risk rises with age and with severe pain in the acute phase.

Important to understand: this nerve pain often responds poorly to ordinary painkillers. It is therefore treated specifically with medicines for nerve pain:

• agents such as gabapentin or pregabalin.
• certain antidepressants at a low dose (for example amitriptyline), which here act against pain.
• locally acting patches with lidocaine or capsaicin.

The best prevention against postherpetic neuralgia is early antiviral treatment and the vaccination. If the pain persists, pain medicine treatment can help. You do not have to put up with it.

Vaccination: the best prevention

There is an effective vaccination against shingles. The recommended one is an inactivated vaccine (Shingrix), given in two doses two to six months apart. The German vaccination committee (STIKO) recommends it:

• as a standard vaccination for everyone aged 60 and over.
• as an indication vaccination for people aged 18 and over at increased risk, for example with a weakened immune system (congenital, acquired or due to medication) or with severe chronic underlying diseases such as cancer, HIV or rheumatoid arthritis.

STIKO expanded this recommendation at the end of 2025. For those at increased risk, it now applies from age 18 instead of from age 50 as before. The vaccination protects very well against shingles and, above all, against postherpetic neuralgia. People who have already had shingles can also be vaccinated, usually a few months after the illness has cleared. More on this: Vaccinations.

When to see a doctor urgently

With shingles you should generally seek medical advice, ideally early because of the 72-hour window. It is especially urgent in these cases:

• shingles on the face, especially near the eye, forehead or nose, or on the ear.
• a weakened immune system, for example during cancer treatment or on immune-suppressing medication.
• severe pain or an extensive, rapidly spreading rash.
• a high fever or a severely affected general condition.

Stay on top of your treatment with brite

Whether an antiviral several times a day or a medicine for nerve pain: brite helps you remember every dose and keep the overview.

• Intake reminders: miss nothing, even with several doses a day.
• Symptom diary: record pain and healing and see how things progress.
• Interaction check: see at a glance whether your medications work well together.
• Medication plan: always up to date and ready for your next appointment.

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