Mitral Valve Disease: 7 Warning Signs You Should Never Ignore

Mitral Valve Disease: 7 Warning Signs You Should Never Ignore

Mitral valve disease often develops quietly. Many people live with a leaky or narrowed valve for years without knowing it, until breathlessness, fatigue, or an irregular heartbeat finally sends them to the doctor. By then, the heart may already be under strain.

The good news: mitral valve disease is easy to diagnose with a simple ultrasound, and treatment has advanced dramatically. Many patients can now have their valve repaired or replaced through a catheter, without open-heart surgery. Here’s how the mitral valve works, the seven warning signs to watch for, and your treatment options.

What Does the Mitral Valve Do?

Your heart has four valves that keep blood flowing in one direction. The mitral valve sits between the heart’s upper left chamber (left atrium) and lower left chamber (left ventricle). It opens to let oxygen-rich blood flow from the lungs into the left ventricle, then closes tightly so blood is pumped forward to the body.

When the mitral valve doesn’t open or close properly, the heart has to work harder, and pressure can back up into the lungs.

                                                         Functional anatomy and pathophysiologic principles in mitral regurgitation: Non-invasive assessment - ScienceDirect

Types of Mitral Valve Disease

  • Mitral regurgitation (leaky valve): The valve doesn’t close tightly, so blood leaks backward with each heartbeat. As the American Heart Association explains, blood moves in two directions with each beat. This is the most common form.
  • Mitral valve prolapse: The valve’s flaps (leaflets) are floppy and bulge backward when the valve closes. Prolapse is common and usually harmless, but in some people it leads to significant leakage. Learn more about mitral valve prolapse.
  • Mitral stenosis (narrowed valve): The valve becomes stiff and doesn’t open fully, restricting blood flow. Worldwide, it’s most often caused by rheumatic fever. In older adults in the U.S., it’s increasingly caused by calcium buildup around the valve.

Mitral regurgitation is also described by its cause. In primary (degenerative) regurgitation, the valve itself is damaged. In secondary (functional) regurgitation, the valve is normal but the heart muscle around it is enlarged or weakened, often from a heart attack or heart failure, which pulls the valve open.

                             Mitral Valve Disease: Types, Causes, and Symptoms - Apollo Hospitals

7 Warning Signs of Mitral Valve Disease

Mild mitral valve disease often causes no symptoms. When symptoms appear, they usually develop gradually, so many people adjust their activity without realizing anything is wrong.

1. Shortness of Breath With Activity

Breathlessness is the most common symptom of mitral valve disease. You may notice it climbing stairs, carrying groceries, or walking at a pace that used to be easy. It happens because blood and pressure back up into the lungs.

2. Trouble Breathing When Lying Flat or at Night

Needing extra pillows to breathe comfortably, or waking up at night short of breath or coughing, is a sign that fluid may be collecting in the lungs. These symptoms suggest the valve problem is putting significant strain on the heart and should be evaluated promptly.

3. Unusual Fatigue and Lower Exercise Tolerance

When the heart can’t pump blood forward efficiently, your muscles and organs get less oxygen. Many patients describe feeling tired all the time, or notice they can’t do as much as they used to. Because it develops slowly, fatigue is often blamed on aging.

4. Heart Palpitations or an Irregular Heartbeat

A leaky or narrowed mitral valve can enlarge the left atrium, which can trigger atrial fibrillation (AFib), an irregular and often rapid heartbeat. You might feel fluttering, pounding or skipped beats. AFib raises the risk of blood clots and stroke, so new palpitations always deserve an evaluation.

5. Swelling in the Feet, Ankles, Legs or Abdomen

As mitral valve disease progresses, it can lead to heart failure and raise pressure in the lungs (pulmonary hypertension), which strains the right side of the heart. Fluid may build up in the lower legs or abdomen, and you may notice rapid weight gain.

6. A Heart Murmur

A murmur is an extra whooshing sound your doctor hears through a stethoscope. Mitral regurgitation and mitral stenosis each have a characteristic murmur. Many murmurs are harmless, but a new murmur, or one found along with symptoms, should be checked with an echocardiogram.

7. Lightheadedness, Chest Discomfort or Coughing

Some people with mitral valve disease feel dizzy or lightheaded, especially with exertion, or have chest discomfort. A persistent cough, sometimes with frothy or blood-tinged mucus, can occur when pressure in the lungs is high, particularly with mitral stenosis.

Call 911 for severe shortness of breath at rest, coughing up pink or frothy mucus, fainting, chest pain, or signs of stroke such as face drooping, arm weakness or trouble speaking. These can signal sudden worsening, such as a ruptured valve support cord, acute heart failure or a stroke from atrial fibrillation.

What Causes Mitral Valve Disease?

  • Degenerative changes with age, including floppy or thickened valve leaflets and torn support cords (chordae)
  • Mitral valve prolapse, which can run in families
  • Heart attack or heart failure, which can stretch or distort the valve
  • Calcium buildup around the valve in older adults, especially those with kidney disease
  • Rheumatic heart disease, a complication of untreated strep throat
  • Infective endocarditis, an infection of the heart valve
  • Congenital heart conditions and certain connective tissue disorders

How Mitral Valve Disease Is Diagnosed

The key test is a transthoracic echocardiogram, a painless surface ultrasound of the heart. It shows how the valve opens and closes, how severe any leak or narrowing is, and how well the heart is pumping. Your cardiologist may also recommend:

  • Transesophageal echocardiogram (TEE), which gives a much more detailed view of the valve from a probe passed into the esophagus, often used when planning repair or replacement
  • ECG or heart monitor to check for atrial fibrillation
  • Cardiac MRI to measure leakage and heart size precisely
  • Exercise testing to see how symptoms and valve function change with activity

People with moderate or severe disease usually need echocardiograms every 6 to 12 months to watch for changes, because the best time to fix a valve is often before the heart muscle is permanently damaged.

Assessment of Mitral Valve Prolapse by 3D TEE: Angled Views Are Key | JACC: Cardiovascular Imaging

Treatment Options for Mitral Valve Disease

Treatment depends on the type and severity of your valve problem, your symptoms, and your overall health. A heart team, including an interventional cardiologist and a cardiac surgeon, often reviews the options together.

Monitoring and medications. Mild disease may need only regular checkups and echocardiograms. Medications can relieve symptoms and treat related conditions, such as diuretics for fluid, heart failure medications for secondary regurgitation, and blood thinners for atrial fibrillation.

Surgical repair or replacement. For many people with primary mitral regurgitation, surgical repair is the preferred treatment, preserving the patient’s own valve. When repair isn’t possible, the valve can be replaced. Some centers offer minimally invasive or robotic surgery through small incisions.

Transcatheter edge-to-edge repair (TEER). For people who are at high risk for surgery, a clip (such as MitraClip or PASCAL) is delivered through a vein in the leg to hold the valve leaflets together and reduce leakage. In the COAPT trial of patients with heart failure and severe secondary regurgitation, TEER plus medication reduced death or heart failure hospitalization by 47% over five years compared with medication alone. Learn more about TEER from Cleveland Clinic.

Transcatheter mitral valve replacement (TMVR). This is the newest option. In December 2025, the FDA approved the SAPIEN M3, the first mitral valve replacement delivered entirely through a vein in the leg, for patients who aren’t candidates for surgery or TEER. Another device, Tendyne, approved earlier in 2025, is placed through a small incision in the chest.

Balloon valvuloplasty. For selected patients with rheumatic mitral stenosis, a balloon threaded through a catheter can widen the narrowed valve.

To learn more about catheter-based heart procedures, read our posts on the benefits of minimally invasive heart treatment and advances in heart disease treatment.

Frequently Asked Questions

Is mitral valve disease serious? It can be. Mild disease often stays stable for years and may only need monitoring. But moderate to severe disease can lead to heart failure, atrial fibrillation, stroke, and pulmonary hypertension if it isn’t treated at the right time. Regular echocardiograms help your cardiologist decide when to act.

Can mitral valve disease go away on its own? Structural valve damage doesn’t heal on its own. However, secondary mitral regurgitation sometimes improves when the underlying heart failure or atrial fibrillation is treated, because the heart becomes smaller and the valve closes better.

Is mitral valve prolapse dangerous? For most people, no. Mitral valve prolapse is common and usually causes little or no leakage. A small number of people develop significant regurgitation or heart rhythm problems over time, so periodic checkups with an echocardiogram are recommended.

Do I need open-heart surgery to fix my mitral valve? Not necessarily. Surgery remains the best option for many people, especially younger, healthier patients with primary regurgitation. For those at higher surgical risk, catheter-based options such as TEER or transcatheter valve replacement may be possible.

Can I exercise with mitral valve disease? Most people with mild disease can exercise normally. If your disease is moderate or severe, ask your cardiologist which activities are safe for you. See our guide to heart-healthy exercises.

Expert Heart Valve Evaluation in Tampa

At Ascent Cardiology, mitral valve disease is evaluated by a board-certified interventional cardiologist who is also a Fellow of the American Society of Echocardiography. We perform echocardiograms in our office, follow valve disease closely over time, and help you understand when treatment is needed. If a procedure is recommended, we coordinate care with the heart teams at Tampa General Hospital and St. Joseph’s Hospital.

If you’ve been told you have a murmur or a leaky valve, or you’re noticing new breathlessness or palpitations, don’t wait. See the 10 warning signs you should see a cardiologist.

Request an appointment or call (813) 540-4322.

602 S Audubon Ave, Suite A, Tampa, FL 33609

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