A new study has found that severe cases of influenza may do more than cause respiratory distress — they could also lead to significant heart damage. Researchers warn that patients hospitalized with serious flu infections face a higher risk of developing cardiac complications, highlighting the need for greater awareness and early intervention.
How the Flu Affects the Heart
Key Findings of the Study
Who Is Most at Risk?
Why This Matters
Influenza is primarily known as a respiratory illness, but in severe cases, the virus can trigger widespread inflammation throughout the body. This intense inflammatory response may strain the heart, potentially leading to conditions such as:
Myocarditis (inflammation of the heart muscle)
Arrhythmias (irregular heartbeats)
Heart attacks
Worsening of existing heart disease
When the body fights off a severe flu infection, the immune response can become overactive. This may damage heart tissue directly or indirectly by increasing clot formation and reducing oxygen supply to the heart.
The study observed patients who were hospitalized with severe influenza and monitored their cardiac health during and after infection. Researchers found that individuals with more intense flu symptoms were significantly more likely to show signs of heart injury, including elevated cardiac biomarkers and imaging abnormalities.
In some cases, heart complications developed even in patients with no prior history of cardiovascular disease. The findings suggest that the risk is not limited to those already diagnosed with heart conditions.
While anyone with severe flu could face cardiac complications, the risk appears higher among:
Older adults
People with pre-existing heart disease
Individuals with diabetes or high blood pressure
Those with weakened immune systems
Health experts emphasize that vaccination remains one of the most effective ways to reduce the severity of influenza and lower the risk of related complications.
Heart complications linked to influenza can have long-term consequences. Even temporary inflammation may increase the likelihood of future cardiovascular events. Early recognition of symptoms such as chest pain, shortness of breath, or unusual fatigue during a flu infection is critical.
The study adds to growing evidence that influenza is not just a seasonal nuisance but a potentially serious systemic illness with effects beyond the lungs. Medical professionals encourage preventive measures, including annual flu vaccination, prompt treatment of symptoms, and close monitoring of high-risk patients.
As research continues, experts hope these findings will encourage stronger public health efforts to prevent severe influenza and protect heart health.