The five most common heart problems are coronary artery disease, heart failure, arrhythmias (particularly atrial fibrillation), valvular heart disease, and cardiomyopathy. Coronary artery disease alone killed over 371,000 Americans in 2022, making it the single deadliest form. Together, cardiovascular diseases claimed 919,032 lives in 2023, roughly one death every 34 seconds.
Each of these conditions affects the heart in a different way, produces different warning signs, and carries different risks. Here’s what you need to know about all five.
1. Coronary Artery Disease
Coronary artery disease is the most common type of heart disease. It develops when cholesterol and other substances build up inside the walls of the arteries that supply blood to the heart muscle. Over time, these deposits, called plaque, narrow the arteries and restrict blood flow. If a plaque ruptures, a blood clot can form on top of it and block the artery entirely. That’s what causes a heart attack.
About 1 in 20 American adults age 20 and older have coronary artery disease. Every year, roughly 805,000 people in the United States have a heart attack, and 605,000 of those are first-time events. The classic symptoms include chest pain or tightness (often called angina), shortness of breath, and pain that radiates to the neck, jaw, throat, upper abdomen, or back. Some people also feel numbness, weakness, or coldness in the legs or arms if plaque has built up in blood vessels outside the heart.
The condition develops over decades. High blood pressure, high cholesterol, smoking, diabetes, and obesity all accelerate plaque buildup. Many people have no symptoms at all until a significant portion of the artery is blocked or a heart attack occurs, which is why routine cholesterol and blood pressure screening matters so much.
2. Heart Failure
Heart failure doesn’t mean the heart has stopped. It means the heart can no longer pump blood efficiently enough to meet the body’s needs. This can happen in two main ways. In one form, the heart muscle weakens and can’t contract forcefully enough, pumping out 40% or less of the blood in its main chamber with each beat (a healthy heart pumps around 55% to 70%). In the other form, the heart muscle stiffens and can’t relax properly between beats, so the chamber doesn’t fill with enough blood in the first place.
These two types feel similar from the outside. Symptoms include shortness of breath during activity or even at rest, fatigue that limits daily tasks, swelling in the legs, ankles, and feet, and waking up at night gasping for air. Fluid can back up into the lungs, making breathing difficult, especially when lying flat.
Coronary artery disease is the leading cause of heart failure, but high blood pressure, valve problems, and cardiomyopathy can all lead to it over time. Heart failure is a chronic condition. Once diagnosed, it typically requires lifelong management through medication, dietary changes (particularly sodium restriction), and monitoring of fluid intake and daily weight to catch fluid buildup early.
3. Arrhythmias
An arrhythmia is any abnormal heart rhythm. Your heart might beat too fast, too slow, or with an irregular pattern. The most common sustained arrhythmia is atrial fibrillation, which affects roughly 1% of the U.S. population, a number projected to reach at least 5.6 million people by 2050 as the population ages.
Atrial fibrillation happens when the upper chambers of the heart quiver chaotically instead of contracting in a coordinated way. This creates turbulent blood flow, which allows blood to pool and form clots. If a clot travels to the brain, it causes a stroke. That stroke risk is the primary reason atrial fibrillation requires treatment even when symptoms feel manageable.
Arrhythmia symptoms vary widely. Some people notice a racing or fluttering sensation in the chest, dizziness, lightheadedness, or fainting. Others feel nothing at all. A slow heartbeat can cause fatigue and shortness of breath, while a fast one may feel like your heart is pounding. Many arrhythmias are discovered incidentally during a routine exam or when a smartwatch flags an irregular rhythm.
4. Valvular Heart Disease
The heart has four valves that open and close with each beat to keep blood flowing in the right direction. Valvular heart disease occurs when one or more of these valves doesn’t open fully (stenosis) or doesn’t close tightly enough (regurgitation, sometimes called a “leaky valve”). Both problems force the heart to work harder.
The two most common forms are aortic stenosis and mitral valve regurgitation. Among people 70 and older, roughly 2 in 100 have significant aortic valve calcification, and about 2 in 100 have degenerative mitral valve disease. These numbers climb steeply with age because valve tissue gradually stiffens, thickens, or accumulates calcium deposits over a lifetime.
Symptoms depend on which valve is affected and how severely, but the general pattern includes chest pain, shortness of breath during exertion, fatigue, fainting or near-fainting, irregular heartbeats, and swollen feet or ankles. Mild valve disease often requires no treatment beyond regular monitoring. More severe cases may need surgical repair or replacement of the damaged valve.
5. Cardiomyopathy
Cardiomyopathy is a disease of the heart muscle itself. Unlike coronary artery disease, which starts in the blood vessels, cardiomyopathy changes the structure or function of the muscle tissue directly. The two most common forms are dilated cardiomyopathy, where the heart chambers stretch and enlarge, and hypertrophic cardiomyopathy, where the muscle wall thickens abnormally.
Dilated cardiomyopathy weakens the heart’s ability to pump, often leading to heart failure. It can result from viral infections, long-term alcohol use, certain medications, or genetic factors. Hypertrophic cardiomyopathy is largely inherited. Scientists estimate that only 1 in 5 people who have it ever get diagnosed, partly because symptoms can be subtle or absent for years. It is one of the leading causes of sudden cardiac arrest in young athletes.
As cardiomyopathy progresses, symptoms mirror those of heart failure: shortness of breath, fatigue, swollen legs, dizziness, and rapid or pounding heartbeats. Some people first learn they have it after a fainting episode or during screening prompted by a family member’s diagnosis.
How These Conditions Overlap
These five conditions don’t exist in isolation. Coronary artery disease is the most common pathway to heart failure. Arrhythmias frequently develop alongside heart failure or valve disease because a structurally damaged heart generates erratic electrical signals. Cardiomyopathy can cause both arrhythmias and heart failure. A person diagnosed with one condition is often monitored for the others.
The shared risk factors are also strikingly consistent: high blood pressure, high cholesterol, smoking, diabetes, obesity, physical inactivity, and age. Addressing those factors reduces your risk across all five categories, not just one. Regular blood pressure and cholesterol checks, maintaining a healthy weight, staying physically active, and not smoking remain the most effective way to protect against the full spectrum of heart disease.