Heart disease is the leading cause of death in the United States, but understanding your personal risk and what you can do about it starts with knowing how your heart works and what goes wrong

Heart disease is not one condition—it is a group of conditions that damage the heart muscle or the blood vessels that supply it. The most common type is coronary artery disease, which happens when plaque builds up inside arteries and narrows the space blood can flow through. Other types include heart failure (when the heart cannot pump blood effectively), arrhythmia (irregular heartbeat), and valve disease (when the heart's valves do not open or close properly).

Your risk depends on factors you cannot change—age, sex, and family history—and factors you can influence, like blood pressure, cholesterol, smoking, weight, physical activity, and diet. Knowing which factors explore to you is the first step toward understanding what screening or prevention steps might matter for your situation.

Key Takeaways

  • Heart disease develops over years as plaque builds in arteries, so early detection through blood pressure and cholesterol screening can catch problems before symptoms appear.
  • Your risk depends on both unchangeable factors (age, family history, sex) and changeable ones (smoking, weight, activity level, diet, blood pressure, and cholesterol).
  • Common warning signs include chest discomfort, shortness of breath, and unusual fatigue, but some people have no symptoms until a heart attack or stroke occurs.
  • Your doctor can estimate your 10-year risk using tools like the Framingham Risk Score or ASCVD calculator, which helps decide whether medication or lifestyle changes are the right next step.
  • Prevention and management focus on controlling blood pressure and cholesterol, not smoking, staying active, and eating a heart-healthy diet—changes that also reduce risk of stroke and diabetes.

How plaque buildup narrows arteries over time

Coronary artery disease starts when cholesterol and other substances collect on the inner wall of an artery. This buildup, called plaque, hardens over months and years. As the plaque grows, it leaves less room for blood to flow, which means less oxygen reaches your heart muscle.

For a long time, you may feel nothing. The narrowing happens slowly, and your body sometimes compensates by using other blood vessels. But if plaque ruptures suddenly, a blood clot can form and block the artery completely. That is when a heart attack happens—the heart muscle starts to die because it is not getting oxygen.

The same process can happen in arteries that supply your brain, which is why coronary artery disease and stroke risk are connected. Controlling the factors that cause plaque buildup—mainly high cholesterol and high blood pressure—slows or stops this process.

Risk factors you cannot change versus ones you can

Some risk factors are fixed: if your father had a heart attack before age 55, or your mother before age 65, your risk is higher. Being male raises risk at younger ages; being female raises it after menopause. Age itself matters—risk climbs after 45 for men and 55 for women. These factors do not determine your fate, but they mean you may need screening or prevention earlier than someone without this history.

The factors you can influence are where your choices matter most. High blood pressure (140/90 or higher) damages artery walls and makes plaque stick. High LDL cholesterol (the kind that builds plaque) directly feeds the problem. Smoking narrows arteries and makes blood clots more likely. Being overweight, especially around the belly, raises blood pressure and cholesterol. Not moving enough weakens the heart and raises blood pressure. A diet high in saturated fat and salt pushes cholesterol and blood pressure up. Untreated diabetes damages blood vessels.

You do not have to fix everything at once. Even one change—quitting smoking, losing 5 to 10 pounds, or adding a 20-minute walk most days—can lower your numbers and your risk.

Symptoms that warrant when ready medical attention

Chest discomfort is the most recognized warning sign, but it does not always feel like pain. Some people describe it as pressure, squeezing, heaviness, or tightness. It may come and go with activity or stress, or it may be constant. It can spread to the arm, jaw, neck, or back.

Other signs include shortness of breath (especially during activity or when lying flat), unusual fatigue or weakness, nausea, lightheadedness, or a cold sweat. Women sometimes report different symptoms—fatigue, shortness of breath, or jaw pain—without chest discomfort at all.

Call 911 when ready if you have chest discomfort that lasts more than a few minutes, especially if it comes with shortness of breath, sweating, or pain radiating to your arm or jaw. Do not drive yourself to the hospital. The first few hours after a heart attack are critical, and an ambulance can start treatment on the way.

Many people with heart disease have no symptoms until a heart attack or stroke happens. This is why screening matters if you have risk factors.

How doctors measure your personal risk

Your doctor can calculate your 10-year risk of a heart attack or stroke using tools like the Framingham Risk Score or the ASCVD (atherosclerotic cardiovascular disease) calculator. These tools combine your age, sex, cholesterol levels, blood pressure, smoking status, and whether you have diabetes. The result tells you whether your risk is low, moderate, or high.

This number matters because it guides decisions about treatment. Someone with low risk might focus on lifestyle changes. Someone with moderate risk might start a cholesterol-lowering medication. Someone with high risk might need multiple medications plus aggressive lifestyle changes.

To calculate your risk, your doctor needs a blood pressure reading, a fasting blood test for cholesterol (total, LDL, HDL, and triglycerides), and information about your smoking history and family background. If you have not had these numbers checked recently, that is often the first step.

Medications that lower cholesterol and blood pressure

Statins are the most commonly prescribed medication for high cholesterol. They work by blocking an enzyme your liver needs to make cholesterol, which lowers LDL (the harmful kind) and slightly raises HDL (the protective kind). Statins also seem to stabilize plaque, making it less likely to rupture. Common statins include atorvastatin, rosuvastatin, and simvastatin. They are taken by mouth once daily, usually in the evening.

If statins alone do not lower cholesterol enough, other medications can be added. PCSK9 inhibitors block a protein that removes LDL from the blood, lowering it further. Ezetimibe blocks cholesterol absorption in the intestines. Bempedoic acid lowers uric acid and LDL.

For blood pressure, several classes of medication work differently. ACE inhibitors and ARBs relax blood vessel walls. Beta-blockers slow the heart rate and reduce the force of contractions. Calcium channel blockers relax arteries. Diuretics remove excess fluid. Your doctor may combine medications to reach a target blood pressure, usually below 130/80.

Aspirin is sometimes used to prevent a second heart attack or stroke in people who have already had one, but it is not routinely recommended for prevention in people without prior events because the bleeding risk can outweigh the benefit.

Lifestyle changes that reduce heart disease risk

Quitting smoking is the single most powerful change you can make. Within weeks, your risk of a heart attack drops. Within a year, your risk of coronary artery disease falls by half. If you have tried and failed, talk to your doctor about medications like varenicline or bupropion, or nicotine replacement, which roughly double your chances of staying quit.

Regular physical activity strengthens your heart and lowers blood pressure, cholesterol, and weight. You do not need to run marathons. The American Heart Association recommends 150 minutes of moderate activity (brisk walking, cycling, swimming) per week, or 75 minutes of vigorous activity (jogging, fast cycling). Even 10-minute walks add up. Start where you are and build gradually.

Eating a heart-healthy diet means limiting saturated fat (found in red meat, full-fat dairy, and coconut oil) to less than 6 percent of your daily calories, cutting back on salt to under 2,300 milligrams per day, and eating more vegetables, fruits, whole grains, fish, nuts, and beans. The Mediterranean diet and DASH diet (Dietary Approaches to Stop Hypertension) are two patterns that have strong evidence behind them.

Losing weight if you are overweight reduces blood pressure and cholesterol. Even a 5 to 10 percent loss can make a measurable difference. Managing stress through exercise, meditation, or counseling may also help, though the evidence is less clear than for the other changes.

When to see a doctor and what to expect

See your doctor if you have chest discomfort, shortness of breath, or other symptoms listed above. If you have no symptoms but are over 40, or over 20 with a family history of early heart disease, ask about screening. Your doctor will take your blood pressure, ask about your symptoms and family history, and may order blood work and an electrocardiogram (EKG), which records the electrical activity of your heart.

If your doctor suspects coronary artery disease, further testing might include a stress test (exercise on a treadmill or stationary bike while your heart is monitored), a coronary calcium scan (a CT scan that detects plaque in arteries), or a coronary angiogram (an invasive procedure where dye is injected into arteries and X-rays show blockages). Not everyone needs all these tests—your doctor will decide based on your symptoms and risk level.

If you are diagnosed with heart disease, your treatment plan will depend on how severe it is. Mild narrowing might be managed with medication and lifestyle changes. Severe blockage might require a stent (a small tube placed inside the artery to keep it open) or bypass surgery (where a healthy blood vessel is grafted to bypass the blocked artery).

Frequently Asked Questions

Can you reverse heart disease or plaque buildup?

Plaque cannot be completely removed by medication or lifestyle changes alone, but it can be stabilized and prevented from growing. In some cases, aggressive treatment of cholesterol and blood pressure may slightly shrink plaque. The goal is to stop the process and prevent a heart attack or stroke, not necessarily to return arteries to their original state.

Is heart disease hereditary?

Heart disease runs in families, but having a parent or sibling with heart disease does not mean you will develop it. Your genes influence your cholesterol, blood pressure, and metabolism, but lifestyle factors matter enormously. Even people with strong family history can lower their risk significantly through diet, exercise, not smoking, and managing blood pressure and cholesterol.

What is the difference between a heart attack and a stroke?

A heart attack happens when blood flow to the heart muscle is blocked, usually by a blood clot in a coronary artery. A stroke happens when blood flow to the brain is blocked. Both are caused by the same underlying disease (plaque buildup in arteries), and both are medical emergencies. The prevention and risk factors are similar.

Do I need medication if my cholesterol is high but I have no symptoms?

Whether you need medication depends on your overall risk, not just your cholesterol number. Your doctor will calculate your 10-year risk using your age, blood pressure, cholesterol, smoking status, and other factors. Someone with high cholesterol but low overall risk might start with lifestyle changes. Someone with high cholesterol and other risk factors might benefit from a statin even without symptoms.

Can young people get heart disease?

Yes, though it is less common. Young people with strong family history, high cholesterol, high blood pressure, diabetes, or who smoke are at higher risk. Plaque buildup starts in childhood and progresses over decades, so prevention matters at any age. If you have risk factors, ask your doctor about screening.