Stroke risk rises in the weeks after shingles

Design

Systematic review of observational studies with mechanistic synthesis

Population

5 epidemiological studies of adults with herpes zoster

Primary outcome

Cardiovascular and cerebrovascular events after zoster

Effect

Stroke risk raised transiently, peaking about 3–4 weeks after onset; no pooled estimate

This systematic review screened 594 records and synthesised five observational studies — cohort, case-control and self-controlled designs — on vascular events after herpes zoster, alongside mechanistic work on how varicella-zoster virus affects blood vessels.

Stroke showed the most consistent association. Risk was highest in the first weeks and months after zoster, with self-controlled analyses placing the peak about three to four weeks after onset. Ophthalmic zoster carried a greater cerebrovascular risk than zoster elsewhere. Evidence for myocardial infarction and peripheral arterial disease was suggestive but less consistent.

The review is small and observational, and gives no pooled effect size. But the timing and the stronger signal after ophthalmic zoster fit a trigger effect through viral vasculopathy and inflammation. It is a reason to review vascular risk at the zoster visit and to take new neurological symptoms in the following month seriously.

• Use the zoster visit to check blood pressure, lipids and antiplatelet adherence in patients at vascular risk.
• Take new neurological symptoms seriously in the month after shingles, particularly ophthalmic zoster.
• Explain to patients that the stroke risk is temporary and the absolute risk is small.
• Offer recombinant zoster vaccination to eligible older adults where it is available.

Why it matters

Shingles is usually managed as a skin and pain problem, but the weeks after it may be a period of raised stroke risk.

Don't overread it

Five observational studies cannot show that zoster causes stroke, or that vaccination prevents it.

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