Most people who get COVID recover within a few weeks. But for some, symptoms persist for months – a condition now known as long COVID. While it’s often associated with fatigue, breathlessness and “brain fog”, growing evidence suggests it may also affect something less visible, but potentially more serious: the heart.

In our recent study, we found that people with long COVID had higher risk of developing cardiovascular disease – including cardiac arrhythmias, heart attack and heart failure. Importantly, the increased risks were seen in people who had never been hospitalised during their initial COVID infection.

Much of the early research on long COVID and heart health focused on patients who were hospitalised, particularly those treated in intensive care. These patients often had multiple risk factors for cardiovascular disease such as being overweight and having hypertension or diabetes. This made it difficult to separate the effects of severe acute illness from the long-term effects of the infection.

However, the majority of people who had COVID were never admitted to a hospital – yet many still developed chronic symptoms of so-called long COVID. To explore the potential risks in this much larger group, we focused specifically on patients who had experienced a mild-to-moderate COVID infection which they managed at home.

We used healthcare data from more than 1.2........

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