COVID-19 and Your Heart: What the Research Shows About Cardiovascular Risk

Alongside brain fog and fatigue, a growing body of research has focused on what COVID-19 does to the cardiovascular system and the findings are consistent enough to take seriously. Long COVID has been linked to a meaningfully higher risk of heart-related complications and notably, this isn't limited to people who were hospitalised with severe illness.

What the research has found

A prospective cohort study published in eClinicalMedicine followed adults aged 18 to 65 with a long COVID diagnosis who hadn't been hospitalised for their original infection and had no pre-existing cardiovascular disease. It found long COVID was associated with an increased risk of cardiovascular disease, particularly cardiac arrhythmias, heart failure and coronary artery disease. This finding matters specifically because it wasn't limited to severe cases, suggesting the cardiovascular risk associated with long COVID extends well beyond the group most people might assume is affected.

Blood vessels appear to age faster after infection

The multinational CARTESIAN study followed nearly 2,400 participants across 18 countries, measuring vascular ageing using a marker called pulse wave velocity, which reflects how stiff and rigid a person's arteries are. People who'd recovered from COVID-19 showed significantly "older" blood vessels compared with people who hadn't been infected, an effect still measurable six months after infection. The effect was particularly pronounced in women and in people with ongoing long COVID symptoms, adding another layer of evidence that the virus's effects on blood vessels can persist well beyond the initial illness.

Is this only relevant to people who were seriously ill?

No and this is one of the more important takeaways from recent research. Evidence of cardiovascular injury has been documented even in people whose original infection was mild or asymptomatic. The cardiovascular system has emerged as one of the organ systems most consistently implicated in long COVID research, alongside the neurological and respiratory systems.

How researchers think this happens

The exact biological mechanisms are still being worked out, but leading theories include direct viral effects on the lining of blood vessels, persistent low-grade inflammation that continues after the acute infection clears and the effects of small blood clots that can form during and after infection. Research into patients with myocardial injury during hospitalisation has found this was linked to a higher risk of death and longer-term cardiovascular problems after discharge, reinforcing the idea that the heart and blood vessels can be affected in ways that outlast the initial infection.

Who seems to be at greater risk

Research has pointed to stronger cardiovascular effects in more socially vulnerable groups and the CARTESIAN study specifically found a more pronounced effect in women. People with pre-existing arrhythmias before infection have also been shown to face a higher long-term cardiovascular and mortality risk after SARS-CoV-2 infection compared with those without a prior heart rhythm condition, suggesting existing heart conditions may compound the risk rather than being unrelated to it.

What symptoms might suggest a cardiovascular link

Symptoms worth mentioning to a GP after COVID-19 include a noticeably faster or irregular heartbeat, chest pain or tightness, breathlessness that's disproportionate to your level of exertion and unexplained swelling in the legs or ankles. None of these symptoms automatically means something serious is happening, but given the research linking COVID-19 to cardiovascular changes, they're worth raising rather than dismissing, particularly if they're new or persistent following an infection.

What you can do

Vaccination remains one of the most evidence-backed ways to reduce your overall risk from COVID-19, including its potential downstream effects on the cardiovascular system, alongside general heart-healthy habits such as staying physically active as your recovery allows, not smoking and managing existing conditions like high blood pressure or diabetes. If you're experiencing persistent symptoms after COVID-19, your GP can assess whether further cardiovascular investigation is appropriate for your specific situation.

When chest symptoms need urgent attention

While most post-COVID cardiovascular symptoms warrant a routine GP appointment rather than an emergency response, certain symptoms should never be delayed. Severe chest pain, particularly if it spreads to the arm, jaw or back, sudden severe breathlessness, or fainting alongside chest discomfort are all reasons to call 999 or go to A&E immediately, regardless of whether you've had COVID-19 recently. The NHS heart attack symptoms page sets out the specific warning signs worth knowing, COVID-19 history or not.

Why this research keeps evolving

Cardiovascular research into COVID-19 has continued to develop years after the initial pandemic, with newer studies using longer follow-up periods and larger sample sizes than early pandemic-era research could achieve. This is one reason recommendations and understanding have shifted over time and it's worth expecting further refinement as more long-term data becomes available, rather than treating any single study as the final word.

Putting the risk in context

It's worth keeping this research in perspective alongside everything else known about COVID-19 and long COVID. An increased relative risk doesn't mean most people who've had COVID-19 will go on to develop heart problems and the majority of people recover without any lasting cardiovascular impact. The value of this research lies in identifying a real, measurable pattern worth monitoring and taking seriously, not in suggesting cardiovascular complications are an inevitable outcome of infection.

As with much long COVID research, the picture will likely become clearer over the coming years as longer-term data accumulates and it's worth checking back on updated guidance periodically rather than treating current findings as the complete and final picture.

If you have a family history of heart disease alongside a recent COVID-19 infection, mentioning both factors to your GP together can help them assess your overall risk picture more accurately than considering either one in isolation.

A quick recap

Emerging research consistently links long COVID to an increased risk of cardiovascular problems, including arrhythmias, heart failure and accelerated blood vessel ageing and importantly, this risk isn't confined to people who had severe initial illness. If you've noticed new heart-related symptoms since having COVID-19, raising them with your GP is a reasonable, sensible step rather than something to dismiss.

Frequently asked questions

Can COVID-19 cause a heart attack?

Research has documented an increased short-term risk of cardiovascular events, including heart attacks, around the time of acute COVID-19 infection, particularly in people with existing risk factors, alongside separate evidence of longer-term cardiovascular risk linked to long COVID.

Does the COVID-19 vaccine affect heart risk?

A rare risk of myocarditis, heart muscle inflammation, has been linked to mRNA vaccines, mostly in younger men and health authorities monitor and adjust recommendations accordingly. This risk is generally considered smaller than the cardiovascular risks associated with COVID-19 infection itself.

How long after COVID-19 can heart problems appear?

Research has documented cardiovascular changes months after infection, including in the CARTESIAN study's six-month vascular ageing measurements, suggesting effects can persist and potentially emerge well beyond the initial illness.

Should I get a heart check-up after having COVID-19?

Routine cardiovascular screening isn't recommended for everyone who's had COVID-19. If you're experiencing symptoms such as chest pain, palpitations or unusual breathlessness, discussing this with your GP is the appropriate next step.

Does this apply to children who've had COVID-19?

Most cardiovascular research following COVID-19 has focused on adults and children generally face a much lower risk of severe illness and complications from COVID-19 overall, though rare inflammatory conditions affecting the heart have been documented in children in specific circumstances.