Cardiovascular disease (CVD) is a group of disorders affecting the heart and blood vessels. It is the leading cause of death worldwide, responsible for an estimated 19.2 million deaths in 2023 alone. The term doesn’t refer to a single illness but rather an umbrella that covers everything from clogged arteries feeding the heart to blood clots forming in the legs.
Conditions Under the CVD Umbrella
When doctors say “cardiovascular disease,” they may be talking about any of the following:
- Coronary heart disease: narrowing or blockage of the arteries that supply blood to the heart muscle itself
- Cerebrovascular disease: disease in the blood vessels that supply the brain, which can lead to stroke
- Peripheral artery disease: narrowed arteries in the arms or legs that reduce blood flow to the limbs
- Rheumatic heart disease: damage to the heart muscle and valves caused by rheumatic fever, a complication of strep throat
- Congenital heart disease: structural heart defects present from birth
- Deep vein thrombosis and pulmonary embolism: blood clots that form in leg veins and can travel to the heart or lungs
Coronary heart disease and stroke account for the largest share of CVD deaths. The other conditions are less common but still serious, and they share many of the same underlying risk factors.
How Artery Damage Develops
Most cardiovascular disease traces back to a process called atherosclerosis, which is the gradual buildup of fatty deposits (plaque) inside artery walls. It starts when cholesterol particles, specifically LDL or “bad” cholesterol, seep into the inner lining of an artery and get trapped there. Once stuck, those particles become chemically altered through oxidation, which triggers an immune response.
Your body sends white blood cells to clean up the modified cholesterol, but those cells often become overwhelmed. They absorb so much fat that they swell into what scientists call foam cells, which pile up and form the core of a plaque. Over time, the artery wall thickens with a mix of fat, dead cells, calcium, and scar tissue. The channel that blood flows through gets narrower. This process can unfold over decades without any symptoms at all.
The real danger comes when a plaque ruptures. The body treats a ruptured plaque like an open wound and forms a blood clot on top of it. That clot can partially or completely block blood flow. If it happens in an artery feeding the heart, the result is a heart attack. If it happens in an artery feeding the brain, the result is a stroke.
Coronary Heart Disease
Coronary heart disease is the most well-known form of CVD. The arteries that wrap around the outside of the heart and supply it with oxygen-rich blood gradually narrow from plaque buildup. You may not have any symptoms until the blockage is severe enough to cause a heart attack or cardiac arrest.
When symptoms do appear, the most common is chest pain or pressure (angina), especially during physical activity or emotional stress. Shortness of breath, fatigue, and pain radiating to the arm, neck, or jaw are also typical. Some people, particularly women and those with diabetes, experience subtler warning signs like nausea, lightheadedness, or unexplained exhaustion.
Doctors have several ways to check for coronary heart disease. A stress test monitors your heart while you walk on a treadmill or ride a stationary bike. A coronary calcium scan uses a CT scanner to measure calcium deposits in your artery walls, which indicates plaque. For a more detailed picture, coronary angiography involves injecting dye into the arteries and taking X-ray images to pinpoint blockages.
Stroke: Two Different Types
Strokes fall into two broad categories, and they involve opposite problems. An ischemic stroke happens when a blood vessel supplying the brain gets blocked, either by a clot that forms locally or one that travels from elsewhere in the body. Brain cells begin dying within minutes from lack of oxygen. About 85% of strokes are ischemic.
A hemorrhagic stroke happens when a blood vessel in the brain ruptures and bleeds. The bleeding deprives nearby tissue of oxygen while also creating pressure that damages surrounding brain cells. High blood pressure is the most common cause of bleeding strokes. Aneurysms, where a weak spot in an artery wall balloons outward and eventually bursts, are another cause.
Both types are medical emergencies where every minute matters. The symptoms overlap: sudden numbness on one side of the body, confusion, trouble speaking, vision problems, severe headache, or loss of balance.
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 develop after a heart attack damages part of the heart muscle, or it can result from years of uncontrolled high blood pressure forcing the heart to work harder than it should.
Doctors classify heart failure by how well the heart still pumps with each beat, measured as an ejection fraction. A healthy heart pushes out roughly 55% to 70% of the blood in its main pumping chamber with each contraction. Heart failure with reduced ejection fraction means that number has dropped to 40% or below. Heart failure with preserved ejection fraction means the heart still squeezes normally (50% or above) but has become too stiff to fill properly between beats. The symptoms, including shortness of breath, swelling in the legs, and fatigue, can be similar in both cases.
Peripheral Artery Disease
Peripheral artery disease (PAD) involves the same plaque buildup that causes coronary heart disease, but it happens in the arteries of the legs or arms instead of the heart. The hallmark symptom is leg pain when walking that eases with rest, a pattern called claudication. Some people with PAD have no symptoms at all and only discover the condition during a routine check.
A simple, painless test called the ankle-brachial index can screen for PAD. A healthcare provider measures blood pressure at your ankle and your arm, then compares the two numbers. A ratio of 1.0 to 1.4 is normal. A ratio below 0.90 indicates PAD, meaning blood flow to your legs is significantly reduced. Scores between 0.90 and 0.99 fall in a borderline range where arteries may be starting to narrow.
Major Risk Factors
Most cardiovascular disease is driven by a handful of modifiable risk factors, meaning things you can change. High blood pressure tops the list. Current guidelines define normal blood pressure as below 120/80. Stage 1 hypertension starts at 130/80, and stage 2 hypertension begins at 140/90. Blood pressure in these higher ranges forces the heart to work harder and accelerates artery damage over time.
High LDL cholesterol is the second major driver, since it’s the raw material for plaque formation. Smoking damages the inner lining of blood vessels, raises blood pressure through nicotine’s effects, and reduces the oxygen-carrying capacity of blood through carbon monoxide exposure. Diabetes roughly doubles the risk of dying from heart disease compared to people without diabetes. Obesity raises the risk both directly and by promoting high blood pressure, unhealthy cholesterol levels, and diabetes.
A diet high in saturated fat, trans fat, and sodium contributes to several of these risk factors simultaneously. Excessive alcohol intake raises blood pressure and triglyceride levels. Physical inactivity increases the chances of developing nearly every other risk factor on this list.
Prevention Through Lifestyle
The same risk factors that cause cardiovascular disease are also the levers for preventing it. Physical activity is one of the most effective. Current guidelines recommend 150 minutes of moderate-intensity aerobic activity per week, which works out to about 30 minutes of brisk walking five days a week. Alternatively, 75 minutes of vigorous activity like jogging provides similar benefits. On top of that, at least two days per week should include muscle-strengthening exercises that work the major muscle groups.
Dietary changes focus on reducing saturated fat, trans fat, sodium, and added sugars while increasing fruits, vegetables, whole grains, and lean protein. For alcohol, the general guideline is no more than one drink per day for women and two for men. Quitting smoking produces rapid cardiovascular benefits: the risk of heart disease starts dropping within weeks and continues declining for years after quitting.
Managing blood pressure and cholesterol through these lifestyle changes, with medication when necessary, can dramatically lower the lifetime risk of heart attack, stroke, and other cardiovascular events. Because atherosclerosis develops silently over decades, the most effective prevention starts well before any symptoms appear.