Mitral valve prolapse (MVP) is a condition where one or both flaps of the mitral valve bulge backward into the upper left chamber of the heart when the heart contracts. It affects roughly 2.6% of the general population, making it one of the most common heart valve abnormalities. The vast majority of people with MVP never develop symptoms or complications, and many discover it incidentally during a routine checkup.
How the Mitral Valve Normally Works
Your heart has four chambers, and the mitral valve sits between the two on the left side: the left atrium (upper chamber) and the left ventricle (lower chamber). When the ventricle contracts to pump blood out to the body, the mitral valve is supposed to close tightly so blood flows forward through the aorta rather than leaking backward. In MVP, the valve’s leaflets are slightly too large or the supporting tissue is too stretchy, so instead of forming a flat seal, one or both leaflets billow back into the atrium like a parachute catching wind.
This bulging doesn’t always cause problems. In many cases the valve still closes well enough to prevent any significant backward leak. When it does allow blood to flow the wrong way, that’s called mitral regurgitation, and the severity of that leak is what determines whether MVP stays harmless or eventually needs treatment.
What Causes It
MVP most often occurs on its own, without any other heart disease present. The leaflets or the connective tissue cords anchoring them are simply structured differently, often with excess tissue that makes them floppy. There’s a strong genetic component: it tends to run in families, and researchers have identified several genes involved in how heart valve tissue develops.
People with inherited connective tissue disorders, such as Marfan syndrome or Ehlers-Danlos syndrome, have higher rates of MVP because the same proteins that give structure to skin, joints, and blood vessels also support heart valve tissue. Still, the vast majority of MVP cases occur in otherwise healthy people with no underlying connective tissue condition.
Symptoms Most People Experience
Most people with MVP have no symptoms at all. When symptoms do appear, they can include:
- Heart palpitations: a fluttering, skipping, or racing sensation in the chest, which is the most commonly reported symptom
- Fatigue: feeling unusually tired, sometimes out of proportion to activity level
- Shortness of breath: particularly during exercise or when lying flat
- Dizziness or lightheadedness
- Chest discomfort: typically sharp or stabbing, different from the pressure-type pain of a heart attack
- Migraines
- Anxiety
These symptoms don’t always correlate with how much the valve is leaking. Some people with significant prolapse feel nothing, while others with minimal prolapse report noticeable palpitations or fatigue. Researchers believe some of these symptoms, particularly the anxiety, dizziness, and palpitations, may relate to how the autonomic nervous system (which controls heart rate, blood pressure, and adrenaline) functions in certain MVP patients rather than to the valve itself.
How MVP Is Diagnosed
Doctors often first suspect MVP during a physical exam with a stethoscope. The hallmark finding is a mid-systolic click, a brief, high-pitched sound that occurs partway through the heartbeat when the valve leaflets snap taut as they bulge into the atrium. If the valve is also leaking, a whooshing sound (murmur) follows the click.
An echocardiogram, which uses ultrasound to create a moving picture of the heart, confirms the diagnosis. It shows the leaflets bowing into the left atrium during contraction and measures how much blood, if any, is leaking backward. This imaging also checks whether the heart chambers have stretched or the pumping function has changed, both of which guide treatment decisions down the line.
When MVP Causes Complications
For most people, MVP remains a benign finding for life. The main complication to watch for is worsening mitral regurgitation. Over years or decades, the valve leak can gradually increase if the leaflets continue to stretch or the supporting cords thin and rupture. When regurgitation becomes severe, the heart has to work harder to compensate for the blood flowing backward, and over time the left ventricle can enlarge and weaken.
Severe mitral regurgitation can lead to heart failure symptoms: worsening shortness of breath, fluid retention, and exercise intolerance. It can also trigger atrial fibrillation, an irregular heart rhythm that raises the risk of stroke. A small subset of MVP patients, those with specific structural features like thickened, redundant leaflets or tissue scarring near the base of the heart, face a slightly elevated risk of dangerous heart rhythm disturbances, though this remains uncommon.
Because progression is gradual, people with MVP and any degree of regurgitation typically get periodic echocardiograms, sometimes annually, sometimes every few years, depending on severity. The goal is to catch changes early enough to intervene before the heart muscle weakens.
Treatment for Mild Cases
If your MVP causes no symptoms and the valve isn’t leaking significantly, no treatment is needed. You’ll likely just have periodic monitoring. For people who experience bothersome palpitations or a racing heart, medications can help. Beta blockers are the most commonly prescribed option; they slow the heart rate and reduce the force of contractions, which makes palpitations less noticeable. Other medications sometimes used include antiarrhythmic drugs for irregular rhythms, diuretics to reduce fluid buildup if there’s mild heart strain, and blood thinners if atrial fibrillation develops.
Antibiotics before dental procedures used to be recommended broadly for MVP patients, but current American Heart Association guidelines say they aren’t usually necessary. The exception is people who’ve had a mitral valve replaced, particularly with a mechanical valve, where antibiotics before dental work help prevent a rare but serious heart infection called infective endocarditis.
When Surgery Becomes Necessary
Surgery enters the conversation when mitral regurgitation becomes severe enough to threaten heart function, whether or not you feel symptoms. Doctors track two key numbers: the ejection fraction (how efficiently the left ventricle pumps) and the size of the left ventricle. If the ejection fraction drops to 60% or below, or the ventricle enlarges past certain thresholds, surgery is recommended even in people who feel fine, because waiting longer risks permanent heart muscle damage.
For people with symptoms like worsening breathlessness or exercise intolerance from severe regurgitation, surgery is recommended as long as heart function hasn’t deteriorated too far to make the operation too risky.
Valve repair, where the surgeon reshapes the existing valve and tightens or replaces the supporting cords, is strongly preferred over valve replacement whenever possible. Repair preserves the natural valve tissue, avoids the need for lifelong blood thinners (which mechanical replacement valves require), and generally has better long-term outcomes. In experienced surgical centers, repair success rates for degenerative MVP are high. Recovery typically involves several days in the hospital and a return to normal activities over six to twelve weeks.
Exercise and Physical Activity
One of the most common concerns after an MVP diagnosis is whether it’s safe to exercise. For the large majority of people, the answer is yes, with no restrictions. If you have MVP with no more than mild regurgitation, normal heart function, and no high-risk features, you can participate in all sports and physical activities, including competitive athletics.
People with moderate regurgitation can still be active, including competitive sports in many cases, as long as their heart’s pumping function is preserved and exercise testing is normal. Restrictions apply mainly to a small group with high-risk features: severe regurgitation, evidence of scar tissue in the heart muscle, a history of unexplained fainting, a family history of sudden cardiac death at a young age, or documented complex irregular rhythms. For these individuals, competitive sports are generally discouraged, though lower-intensity recreational activity may still be appropriate after evaluation.
Regular aerobic exercise is actually beneficial for most MVP patients. It improves cardiovascular fitness, can reduce palpitation frequency, and helps manage the anxiety and fatigue that sometimes accompany the condition. Staying well hydrated and limiting caffeine and alcohol are practical steps that many people find reduce palpitation episodes.