Friends, medical research has established a strong, long-term link between Shingles (herpes zoster) and an elevated risk of major Cardiovascular events, specifically strokes and heart attacks. Shingles is primarily recognised as a painful skin rash caused by the reactivation of the varicella-zoster virus (the virus behind chickenpox). Its impact extends well beyond the skin and local nerves.
( I had already written a blog on Shingles on 26th March 2024)
Key Factors From Research
- Elevated Risk: Studies, including large-scale data published, show that having a history of shingles increases the risk of stroke by 38% and coronary heart disease (including heart attacks) by up to 25% compared to individuals without a history of shingles.
- Highest Danger Window: The acute risk is highest in the immediate weeks and months following shingles flare-up.
- Long–Term Persistence: Emerging evidence indicates that this elevated risk does not disappear quickly; increased cardiovascular risk can persist for 12 years or more after the initial outbreak of shingles.
Biological Mechanism: How Shingles Triggers Cardiovascular Events
Researchers have identified several primary ways and reactivation of the varicella-zoster virus affects the heart and circulatory system:
- Arterial Replication & Inflammation: Varicella-zoster is the only human virus that directly infects and replicates inside the walls of blood vessels. This causes localised inflammation, weakens vessel walls, and can trigger the rupture of fatty plaque, forming blood clots.
- Pro–Thrombotic Plasma Changes: Recent studies suggest that shingles alters cellular components (specifically plasma exosomes), filling them with inflammatory and pro-clotting proteins. This makes blood more prone to dangerous clotting.
- Nerve Mediated Stress: The severe pain and nerve inflammation associated with shingles elevates systemic stress and sympathetic tone, rising blood pressure- a major risk factor for stroke and heart attack.
Risk Factors and Modifying Factors
Location of Rash– Shingles affecting the face or eyes carries a higher risk of ischemic stroke due to proximity to cranial blood vessels.
Shared Risk Factors– Older age, high blood pressure, elevated cholesterol, and diabetes increase the likelihood of both shingles outbreaks and heart events.
Reverse Link- Pre-existing cardiovascular disease is associated with a higher likelihood of contracting shingles, likely due to chronic low-grade inflammation altering immune functions.
Prevention and protection Strategies
1 Vaccination: The recombinant shingles vaccine (Shingrix) is the most effective defense against developing shingles and its complications. Studies indicate that vaccination lowers the downstream risk of suffering a stroke.
2 Early Antiviral Treatment: Starting prescription antiviral treatment within 72 hours of rash appearing helps limit viral replication, reducing severity and potentially mitigating vascular damage.
3 Standard Cardiovascular Care: Managing traditional risk factors through diet, exercise, blood pressure monitoring, and smoking cessation remains critical for anyone with a history of shingles.
In the end, the important message is not to panic after developing shingles. Rather, shingles should be treated promptly, cardiovascular risk factors should be addressed, and new neurological or cardiac symptoms should always be treated as emergencies. For older adults, vaccination offers an important opportunity to prevent shingles and its painful complications- and may potentially have cardiovascular benefits as well.
Anil Malik
Mumbai, India
30th September 2026