A systematic review searched four databases for observational studies of cardiovascular or cerebrovascular events after herpes zoster or herpes zoster ophthalmicus. Of 594 records, five epidemiological studies entered the main synthesis, alongside separate mechanistic reports.
Stroke showed the most consistent association. Risk was highest in the first weeks to months, and self-controlled analyses suggested a peak about 3 to 4 weeks after onset. Ophthalmic zoster carried greater cerebrovascular risk than zoster generally. Evidence for myocardial infarction and peripheral arterial disease was suggestive but less consistent. The abstract does not give effect sizes.
These are associations from a small number of observational studies. They fit a plausible mechanism through viral vasculopathy and inflammation, but they do not show that treating or preventing zoster reduces strokes in a given patient.
- Ask about new neurological symptoms in the weeks after shingles, especially after ophthalmic involvement
- Review vascular risk factors in older adults presenting with zoster
- Counsel patients to seek urgent help for sudden weakness, speech or vision change
- Zoster vaccination remains a separate decision based on age and local guidance
Why it matters
A common, self-limiting rash is also a marker for a short period of raised vascular risk.
Don't overread it
Five observational studies cannot establish causation, and the abstract reports no effect sizes.
The statistics, in plain English
A self-controlled analysis compares each person's risk in the weeks after shingles with their own risk at other times, which removes fixed differences between people. It cannot remove changes that happen at the same time as the illness, such as infection-related inflammation or reduced activity.
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