Heart disease is a group of conditions that affect the heart’s structure or function, and it is the leading cause of death for men, women, and people of most racial and ethnic groups in the United States. In 2023, more than 919,000 Americans died from cardiovascular disease, with coronary heart disease alone killing over 371,000 people in 2022. The term covers a wide range of problems, from blocked arteries to faulty heart valves to irregular rhythms, and understanding the basics can help you recognize warning signs and reduce your risk.
Heart Disease vs. Cardiovascular Disease
These two terms are often used interchangeably, but they don’t mean the same thing. Cardiovascular disease is the broader category, covering any condition that affects the heart or blood vessels throughout the body. Heart disease is more specific: it refers only to diseases of the heart itself, such as coronary artery disease, heart failure, valve abnormalities, and abnormal heart rhythms. A condition like peripheral artery disease, which affects blood vessels in the legs, falls under cardiovascular disease but not heart disease.
The Main Types
Coronary artery disease is the most common form. It develops when the arteries that supply blood to the heart muscle become narrowed or blocked by plaque buildup, a process called atherosclerosis. Over time, this restricts blood flow and can trigger chest pain or a heart attack.
Heart failure doesn’t mean the heart has stopped. It means the heart can’t pump blood efficiently enough to meet the body’s needs. Fluid can build up in the lungs, ankles, and legs, causing shortness of breath and swelling. Heart failure often develops gradually after other conditions, like long-standing high blood pressure or a previous heart attack, have weakened the heart muscle.
Arrhythmias are problems with the heart’s electrical system that cause it to beat too fast, too slow, or irregularly. Atrial fibrillation is the most common type. When abnormal rhythms persist, they can weaken the heart muscle over time, leading to a reversible form of heart damage. The heart chambers may stretch and thin, pumping less effectively, though this can often improve once the rhythm is corrected.
Valvular heart disease occurs when one or more of the heart’s four valves don’t open or close properly. This forces the heart to work harder to push blood in the right direction, and over years, that extra strain can lead to heart failure.
How Plaque Builds in Your Arteries
Atherosclerosis doesn’t happen overnight. It begins when the inner lining of an artery is damaged by risk factors like high blood pressure, high cholesterol, or smoking. Once that lining is irritated, white blood cells stick to the damaged surface and burrow into the artery wall. Smooth muscle cells then migrate into the area and begin multiplying, creating a thickened layer.
Fats circulating in the blood get trapped in this thickened wall, where they undergo chemical changes that keep the inflammation going. Over time, the accumulated fat forms a soft, fatty core inside the artery wall. The plaque may harden through a process similar to bone formation. If the plaque’s surface ruptures, it can trigger a blood clot that suddenly blocks the artery, cutting off blood flow and causing a heart attack.
Risk Factors That Drive It
High blood pressure forces the heart to work harder with every beat and damages artery walls over time. High cholesterol, particularly high LDL (“bad”) cholesterol, provides the raw material for plaque formation. Diabetes accelerates artery damage because elevated blood sugar injures blood vessel linings and promotes inflammation.
Smoking is one of the most potent risk factors: it damages the inner lining of arteries, raises blood pressure, and makes blood more likely to clot. Obesity, physical inactivity, and a diet high in sodium and processed foods all compound the risk. A family history of heart disease also raises your chances, especially if a close relative was diagnosed at a young age.
Symptoms Differ Between Men and Women
The classic image of a heart attack is someone clutching their chest in pain. That does happen, but it’s more reliably a male presentation. A large meta-analysis published in the Journal of the American Heart Association found that women experiencing a cardiac event were 30% less likely than men to report chest pain. Instead, women had significantly higher odds of presenting with pain between the shoulder blades (more than twice as likely), nausea or vomiting (64% more likely), and shortness of breath (34% more likely).
Women were also more likely to experience neck pain, jaw pain, palpitations, fatigue, dizziness, and fainting. Interestingly, arm and shoulder pain showed no significant difference between men and women. These differences matter because women who don’t recognize their symptoms may delay seeking help, and healthcare providers may be slower to suspect a cardiac event when the presentation doesn’t fit the textbook pattern.
How Heart Disease Is Diagnosed
Diagnosis typically starts with straightforward tests. An electrocardiogram (EKG) records the heart’s electrical activity and can reveal whether the heartbeat is too fast, too slow, or irregular. It also shows the strength and timing of electrical signals moving through different parts of the heart, which helps identify damage from a past heart attack or signs of an ongoing one.
An echocardiogram uses ultrasound to create moving images of the heart. It shows the size and shape of the heart, how well it’s pumping, and how blood flows through the chambers and valves. It can also detect blood clots, fluid buildup around the heart, and problems with the aorta. When a doctor hears a heart murmur, an echo is often the next step to see if a valve is damaged.
A stress test evaluates how the heart performs under physical exertion, because some problems only become apparent when the heart is working hard. You’ll typically walk on a treadmill or ride a stationary bike while your heart is monitored. If you can’t exercise, medication can simulate the effect. Imaging is often combined with the stress test to show blood flow through the heart in real time.
Screening Before Symptoms Appear
Heart disease often develops silently for years before causing symptoms, which makes routine screening important. The American Heart Association recommends cholesterol testing starting at age 20, repeated every four to six years for people at normal risk and more often for those at elevated risk. Blood pressure should be checked at every regular healthcare visit, or at least once a year if it’s below 120/80.
Blood glucose testing is recommended at least every three years, with the American Diabetes Association suggesting that everyone begin screening by age 45. If you’re overweight and have at least one additional cardiovascular risk factor, glucose testing may be appropriate regardless of age. Body weight and BMI are assessed at routine visits, and waist circumference may be measured if your BMI is 25 or higher, since carrying extra weight around the midsection raises cardiovascular risk.
Treatment Options
Treatment depends on the type and severity of heart disease, but medication is often the first line. Blood thinners and antiplatelet drugs help prevent clots from forming in narrowed arteries or inside stents. Beta blockers slow the heart rate and lower blood pressure, making it easier for the heart to pump, and they’re commonly used after a heart attack to reduce the risk of another one. ACE inhibitors and related drugs relax blood vessels and lower blood pressure, easing the heart’s workload. Diuretics help the body shed excess fluid, reducing swelling and the strain on the heart.
When medications aren’t enough, procedures like angioplasty (opening a blocked artery with a tiny balloon and placing a stent to keep it open) or coronary bypass surgery may be necessary. For arrhythmias, treatments range from medications to devices like pacemakers or implantable defibrillators. Severe valve disease may require surgical repair or replacement.
Reducing Your Risk
The same risk factors that cause heart disease are largely modifiable. Aim for at least 150 minutes per week of moderate aerobic activity, like brisk walking, or 75 minutes of vigorous activity, like running. Add two or more strength training sessions per week. This combination helps lower blood pressure, improve cholesterol levels, and maintain a healthy weight.
A diet centered on fruits, vegetables, whole grains, lean protein, and healthy fats while limiting sodium, added sugars, and processed foods makes a measurable difference. If you smoke, quitting is the single most impactful change you can make for your heart. Managing stress, getting adequate sleep, and keeping conditions like high blood pressure and diabetes under control with your healthcare provider all reduce your long-term risk significantly.