Your heart valves are precision mechanisms. Each one—the mitral, tricuspid, aortic, and pulmonary—opens and closes tens of thousands of times a day, keeping blood moving in the right direction. When a valve becomes stiff (stenosis) or leaky (regurgitation), the heart has to work harder to pump blood. Over time, this extra strain can lead to fatigue, shortness of breath, and more serious complications. Understanding how this happens is the first step in protecting your heart.
Cardiovascular disease is often talked about in terms of blocked arteries, but valve disease is a distinct and common problem, especially in older adults. In fact, about 2.5% of the U.S. population has some form of valvular heart disease, and the prevalence rises sharply after age 65. Here is a practical breakdown of the main ways heart valve disease develops.
What causes a valve to stiffen or leak?
There is no single cause. Instead, valve disease usually results from a combination of age-related wear, underlying health conditions, and sometimes infection or birth defects. The most common culprits fall into a few clear categories.
Age-related calcification
This is the leading cause of aortic stenosis, the most common form of valve disease in developed countries. Over decades, calcium deposits can build up on the aortic valve leaflets. The tissue becomes thicker and less flexible, making it harder for the valve to open fully. Think of it like a hinge that gradually rusts. Research shows that up to 3% of people over 75 have moderate to severe aortic stenosis, and the number climbs with age.
Calcific valve disease shares some risk factors with atherosclerosis (hardening of the arteries)—high cholesterol, high blood pressure, smoking, and diabetes all accelerate the process. Unlike heart attacks, which involve plaque in the coronary arteries, this is calcium settling directly on the valve surface.
Rheumatic heart disease
Though less common in the United States now, rheumatic heart disease remains a major cause of valve problems worldwide. It begins with an untreated strep throat infection that triggers an autoimmune response. The body's immune system attacks its own tissues, especially the heart valves, causing inflammation and scarring. This can lead to thickened, fused valve leaflets—most often the mitral valve. The damage may not become symptomatic for decades after the initial infection, which is why it often appears as a surprise diagnosis in later life.
Mitral valve prolapse (MVP)
Mitral valve prolapse is a structural issue where the valve's flaps bulge backward into the left atrium when the heart contracts. In most people, MVP is harmless and causes no symptoms. But in a small percentage of cases, the prolapse worsens over time, leading to a leaky valve (mitral regurgitation). The exact cause is often unknown, though it can run in families and is associated with connective tissue disorders such as Marfan syndrome.
Infective endocarditis
Infective endocarditis is a bacterial or fungal infection of the inner lining of the heart, including the valves. Bacteria from another part of the body—often the mouth, skin, or gut—enter the bloodstream and settle on damaged or abnormal valves. The infection can destroy valve tissue, create holes, or cause growths (vegetations) that interfere with valve function. People with pre-existing valve conditions, artificial valves, or certain congenital heart defects are at higher risk. Good dental hygiene and prompt treatment of infections can lower the odds.
Congenital valve defects
Some people are born with valves that don't form correctly. The most common example is a bicuspid aortic valve, where the valve has two flaps instead of the normal three. A bicuspid valve often works well early in life but tends to calcify and narrow faster than a normal valve, sometimes causing significant stenosis by the fifth or sixth decade. Other congenital issues include Ebstein anomaly (a malformed tricuspid valve) and pulmonary valve stenosis.
How do symptoms progress?
One of the trickiest things about valve disease is that it can progress silently for years. The heart compensates by pumping harder and thickening its muscle walls. Symptoms tend to appear only when the valve problem is moderate to severe. Common warning signs include:
- Shortness of breath during activity or when lying flat
- Fatigue and reduced exercise tolerance
- Heart palpitations or a sensation of a racing heartbeat
- Swelling in the ankles, feet, or abdomen (from fluid retention)
- Chest discomfort or pressure
- Dizziness or fainting, especially with exertion
These symptoms are not unique to valve disease, which is why it can be easily mistaken for aging, deconditioning, or lung issues. A stethoscope exam may reveal a heart murmur—a whooshing sound caused by turbulent blood flow—which often prompts further testing with an echocardiogram.
Who is most at risk?
Certain groups face a higher likelihood of developing valve disease. Age is the strongest risk factor, but others include:
- History of rheumatic fever (even if you had it decades ago)
- High blood pressure, which puts extra mechanical stress on the valves
- High cholesterol, linked to faster calcification
- Diabetes mellitus
- Smoking
- Radiation therapy to the chest (typically for lymphoma or breast cancer)
- Connective tissue disorders such as Marfan or Ehlers-Danlos syndromes
- Chronic kidney disease, which alters calcium-phosphorus metabolism
Can valve disease be prevented?
Some causes, like congenital defects, are not preventable. But you can reduce your risk of developing the most common forms of valve disease by controlling the same risk factors that protect your arteries. That means managing blood pressure and cholesterol, staying physically active, avoiding tobacco, and controlling diabetes. Good oral hygiene is also important because it reduces the risk of bacteria entering the bloodstream and seeding an infection on the valves.
Bottom line: Heart valve disease is not a single condition—it is a family of problems with different roots, from aging and calcium buildup to infection and birth defects. Recognizing how it develops helps you know when to pay attention to symptoms and what lifestyle steps actually make a difference.
