When you hear the phrase "leaky heart valve," it can sound alarming. But this common condition, medically known as valvular regurgitation, affects millions of people — and many live with it for years without symptoms. To help you understand what's actually going on inside your chest, we spoke with cardiologists about the four main drivers behind a leaky heart valve, and what they want you to know.
1. Age-related wear and tear
The most frequent cause of a leaky heart valve is simply getting older. Over decades, the delicate leaflets of your valves — which open and close with every heartbeat — can thicken, stiffen, or become calcified. This process, called degenerative valve disease, prevents the valve from sealing completely. Some blood then flows backward (regurgitation) instead of moving forward. While this can happen in any valve, the aortic and mitral valves are most commonly affected.
2. High blood pressure and heart muscle strain
Uncontrolled hypertension forces your heart to work harder to pump blood. Over time, this extra pressure can stretch the heart's chambers and the ring-like structure (annulus) that supports the valve. When the annulus stretches, the valve leaflets can no longer close snugly — allowing blood to leak backward. Cardiologists emphasize that managing blood pressure is one of the most effective ways to slow or prevent the progression of valve leakage.
3. Past infections and untreated strep
Certain infections can directly damage heart valve tissue. The most historically significant is rheumatic fever, which can follow an untreated or inadequately treated Group A streptococcal infection (like strep throat). The body's immune response scars the valve leaflets, making them leaky. Though less common in developed countries today, rheumatic heart disease remains a major cause of valve problems worldwide. Other infections, like infective endocarditis (bacteria entering the bloodstream and settling on the valve), can also create sudden or gradual leakage.
4. Structural problems you're born with
Some people are simply born with an anatomical variation that predisposes them to valve leakage. The most common is a bicuspid aortic valve, which has only two leaflets instead of three. This abnormal structure makes the valve more prone to wear, calcification, and eventual leakiness — often earlier in life than age-related changes would appear. Mitral valve prolapse, where the leaflets bulge backward into the left atrium, is another common congenital cause of leakage.
Many people with mild-to-moderate valve leakage never need treatment. Your cardiologist will monitor you with regular echocardiograms to track changes — not every leak needs a fix.
How do I know if I have a leaky valve?
Most leaky valves are discovered by chance during a routine physical exam when your doctor hears a heart murmur. Not all murmurs are dangerous, but they signal that blood flow is turbulent. If your doctor suspects a problem, they'll likely order an echocardiogram — an ultrasound of your heart — to visualize the valve and measure the severity of the leak.
When should I worry?
Severe valve leakage can eventually cause symptoms like shortness of breath, fatigue, swollen ankles, or a feeling of rapid or irregular heartbeats (palpitations). If you experience any of these, especially with exertion, speak to your healthcare provider. Cardiologists stress that early detection and regular monitoring are far more important than panic — many people with leaky valves live full, active lives with appropriate care.
The bottom line: A leaky heart valve is not automatically a crisis. Understanding what causes it — age, blood pressure, infection, or congenital structure — helps you and your doctor make smart decisions. Stay on top of your annual checkups, know your blood pressure numbers, and don't ignore new symptoms.
