Study Finds Higher Cardiovascular Risk After Herpes Zoster

Herpes zoster, commonly known as shingles, has long been recognized as a painful condition that occurs when the varicella-zoster virus reactivates in the body. While the condition is often associated with nerve pain, rash, and postherpetic neuralgia, new research shows that its impact may extend far beyond the skin and nervous system.

A growing body of evidence suggests that individuals who experience herpes zoster may face a higher risk of cardiovascular disease (CVD) events, particularly heart attacks and strokes. Understanding this connection is essential for clinicians, patients, and caregivers working to manage long-term health outcomes.

Herpes Zoster: A Brief Overview

Herpes zoster develops when the virus responsible for chickenpox reactivates years or decades later. This reactivation typically occurs in older adults or individuals with weakened immune systems. The condition often presents as a painful, blistering rash on one side of the body, accompanied by burning, tingling, or sharp nerve pain.

While shingles itself usually resolves within a few weeks, the inflammation triggered during an outbreak can lead to broader effects in the body. As researchers continue studying these systemic responses, evidence increasingly points to cardiovascular involvement as an important area of concern.

Research Linking Herpes Zoster to Cardiovascular Risk

Multiple studies over the last decade have examined whether shingles increases the likelihood of cardiovascular events. Most have reached similar conclusions: individuals who experience herpes zoster may have a significantly higher risk of heart attack, stroke, or other major cardiovascular outcomes in the months and years following the episode.

Elevation in Risk Shortly After Infection

Research consistently shows that cardiovascular risk appears to be highest shortly after the onset of shingles. Some studies demonstrate:

• A notable increase in heart attack risk within the first week after a herpes zoster outbreak
• A higher likelihood of stroke in the initial weeks and months following the infection
• Gradual risk reduction over time, but not always a complete return to baseline levels

The immediate rise in cardiovascular events suggests that acute inflammation caused by the virus plays a substantial role.

Long-Term Cardiovascular Implications

While early risk increases are more pronounced, several studies indicate that the elevated risk may persist for up to a year or longer. Some research suggests longer-lasting effects for individuals who develop herpes zoster ophthalmicus, a form of shingles affecting the eye, or for those who experience recurring episodes.

Long-term inflammation, vessel damage, and immune responses triggered by reactivation of the virus may contribute to lasting cardiovascular changes.

Why Herpes Zoster May Impact Heart Health

The association between herpes zoster and cardiovascular disease is complex but increasingly understood through research on inflammation, immune response, and vascular health.

Inflammation and Blood Vessel Stress

When the varicella-zoster virus becomes active, it triggers a strong inflammatory response. Inflammation is known to create stress within blood vessels, potentially destabilizing plaque or narrowing arteries. This inflammatory surge may temporarily increase the risk of blood clots, contributing to heart attack or stroke.

Viral Effects on Blood Vessels

Some studies suggest that the virus can directly affect the walls of blood vessels. Reactivation may lead to inflammation within arteries, a condition known as vasculopathy. This can impair blood flow or create conditions where clots form more easily.

Impact on Older Adults and Those With Other Risks

Older adults, who are already at elevated cardiovascular risk, make up the majority of herpes zoster cases. When an outbreak occurs in individuals with pre-existing risk factors such as hypertension, high cholesterol, diabetes, or smoking history, the added inflammatory burden may further increase the chances of cardiovascular events.

Who Is Most at Risk?

While anyone who has had chickenpox can develop shingles, certain groups may face a higher cardiovascular risk after an episode.

Older Adults

Age is the most significant risk factor for both shingles and cardiovascular disease. As individuals age, immune function declines, and the risk of inflammation-related complications rises.

Individuals With Weakened Immune Systems

People with compromised immune systems, whether due to medical conditions or certain treatments are more likely to experience severe shingles outbreaks. This population may also have a higher susceptibility to cardiovascular complications.

People With Chronic Health Conditions

Those with chronic conditions such as diabetes, high blood pressure, or obesity may experience heightened inflammation and vascular stress during a herpes zoster outbreak, increasing cardiovascular risk.

Individuals With Herpes Zoster Ophthalmicus

Shingles affecting the eye is associated with a higher risk of stroke compared to typical shingles outbreaks, likely due to more significant involvement of cranial nerves and blood vessels.

Prevention Strategies and Risk Reduction

Understanding the link between herpes zoster and cardiovascular risk underscores the importance of prevention and proactive health management.

Vaccination as a Key Preventive Tool

The shingles vaccine is one of the most effective ways to reduce the likelihood of developing herpes zoster and its complications. For older adults and individuals with high cardiovascular risk, vaccination may provide an added layer of protection against inflammation-related heart events.

Monitoring After a Shingles Episode

Individuals who experience herpes zoster should inform their healthcare provider, especially if they have existing cardiovascular conditions. Monitoring blood pressure, cholesterol levels, and symptoms during the months following an outbreak may help detect issues early.

Managing Inflammation and Overall Health

Healthy habits that support immune function and reduce inflammation can help lower overall cardiovascular risk. These include:

• Regular physical activity
• A heart-healthy diet
• Stress management
• Adequate sleep
• Quitting smoking

Together, these practices promote long-term heart and immune health.

Early Action for Concerning Symptoms

Recognizing warning signs of cardiovascular events is essential. Chest pain, sudden numbness, difficulty speaking, or severe headache should be treated as medical emergencies.

Implications for Public Health and Clinical Practice

The relationship between herpes zoster and cardiovascular risk emphasizes the need for clinicians to consider shingles as more than a skin condition. Public health messaging may increasingly highlight the potential heart-related risks, while healthcare providers may monitor heart health more closely following a shingles episode.

Shingles vaccination campaigns may also play a crucial role in reducing not only the disease itself but also its secondary cardiovascular effects.

Conclusion

Research continues to strengthen the connection between herpes zoster and an increased risk of cardiovascular disease events. While most individuals recover from shingles without long-term complications, the temporary rise in heart attack and stroke risk is an important consideration for both patients and healthcare providers. Vaccination, early monitoring, lifestyle management, and awareness of symptoms all contribute to reducing risk and protecting heart health.

Herpes zoster should be viewed within a broader health context, one where understanding and addressing secondary risks can help ensure better outcomes for individuals of all ages.