Chronic Stress Could Be Damaging Your Heart Before You Notice Any Symptoms, Study Finds

Stress is often treated as something that affects how you feel, but new research suggests its effects may extend much deeper into the body.

A large study of nearly 480,000 UK adults found that people with higher levels of chronic inflammation had structural changes in their hearts and a greater risk of heart attack and stroke. Some of these changes may develop years before obvious cardiovascular symptoms appear.

The findings, published in the European Journal of Preventive Cardiology, suggest chronic inflammation could be one biological pathway linking psychological distress, socioeconomic circumstances and lifestyle factors with cardiovascular disease.

What Did the Study Find?

Researchers from the MRC Laboratory of Medical Sciences and Imperial College London analysed UK Biobank data, combining blood tests, heart imaging and genetic information.

They focused on glycoprotein acetyls, or GlycA, a blood marker associated with chronic inflammation.

Participants with the highest levels of inflammation, representing the top 20%, had a 43% higher risk of heart attack and stroke than those with the lowest levels, or the bottom 20%. This association was also observed among people without pre-existing heart disease.

Those with higher inflammation also showed signs of structural changes in the heart, including thicker heart walls, smaller heart chambers, and poorer filling of the heart.

These alterations can potentially progress over time and contribute to heart failure, although the researchers stressed that people exposed to adverse circumstances or with genetic susceptibility are not destined to develop cardiovascular disease.

How Could Stress Affect the Heart?

Chronic stress does not necessarily mean feeling stressed every minute of the day. Long-term psychological distress can affect the body's biological systems, while factors such as smoking, physical inactivity, excess body fat and socioeconomic disadvantage can also contribute to inflammation.

The researchers found strong associations between higher inflammation and psychological distress, socioeconomic disadvantage, smoking and excess body fat.

This does not mean stress directly causes heart disease. Rather, the findings suggest inflammation may be one mechanism through which prolonged exposure to stressful circumstances and other risk factors can affect cardiovascular health.

Why Can the Damage Go Unnoticed?

One reason cardiovascular disease can be difficult to detect early is that structural changes may occur without obvious symptoms.

The study found that people with higher inflammation could have changes to the heart while apparently having no existing cardiovascular disease. This raises the possibility that biological damage can develop silently before a person experiences a heart attack, stroke or symptoms associated with heart failure.

Researchers also identified inflammatory proteins belonging to the interleukin-1 and tumour necrosis factor families as potentially important contributors to the observed heart changes. Some of these proteins are already being investigated as targets for anti-inflammatory treatments.

What Can You Do About Chronic Inflammation?

The findings do not mean everyone experiencing stress needs an inflammation test. GlycA is a research marker rather than a routine test that people should use to diagnose heart disease themselves.

Instead, the results reinforce the importance of addressing established cardiovascular risk factors. Researchers highlighted smoking and excess body fat, while the study also linked inflammation with physical inactivity and poor mental health.

Managing chronic stress, staying physically active, avoiding smoking, and maintaining a healthy weight can all form part of a broader approach to cardiovascular health.

Most importantly, stress should not be viewed as a personal failing. The researchers found that social and economic circumstances were also strongly associated with inflammation, suggesting that cardiovascular health is influenced by factors beyond individual choices.

The study offers a reminder that heart health is not simply about what happens when symptoms appear. Some biological changes may begin much earlier, making prevention and attention to long-term risk factors particularly important.