Cardiovascular disease (CVD) is not a single illness but a group of disorders affecting the heart and blood vessels. It is the leading cause of death worldwide, and the term covers everything from clogged arteries feeding the heart to blood clots forming in the legs. Understanding which conditions fall under this umbrella, how they develop, and what drives them can help you recognize your own risk and take steps to lower it.
Conditions That Fall Under CVD
When doctors say “cardiovascular disease,” they may be referring to any of several distinct problems:
- Coronary heart disease: narrowing or blockage of the blood vessels that supply the heart muscle itself. This is the most common form and the one most people picture when they hear “heart disease.”
- Cerebrovascular disease: disease of the blood vessels supplying the brain, which can lead to stroke.
- Peripheral arterial disease: reduced blood flow to the arms and legs, usually the legs.
- Heart failure: a condition in which the heart can no longer pump blood effectively enough to meet the body’s needs.
- Rheumatic heart disease: damage to the heart muscle and valves caused by rheumatic fever, a complication of untreated 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.
Each of these has its own symptoms and trajectory, but most share a common underlying process: damage to blood vessels that restricts or blocks blood flow to vital organs.
How Artery Disease Develops
The process behind most CVD is atherosclerosis, the gradual buildup of fatty deposits (plaques) inside artery walls. It starts when LDL cholesterol, often called “bad” cholesterol, accumulates in the inner lining of an artery. Once there, those cholesterol particles undergo chemical changes that trigger an immune response. The body sends white blood cells to the site, and they absorb the altered cholesterol, forming a fatty streak.
Over years or decades, that streak grows. The artery wall becomes inflamed, and layers of calcium, fat, and scar tissue pile up. The vessel lining becomes leakier, which pulls in even more cholesterol and accelerates the cycle. Eventually the plaque can narrow the artery enough to restrict blood flow, causing symptoms like chest pain during exertion.
The real danger often comes not from the slow narrowing but from a sudden rupture. Plaques with thin outer caps can crack open, exposing their inner material to the bloodstream. This triggers a blood clot that can seal off the artery entirely within minutes, cutting off oxygen to the heart (heart attack) or brain (stroke).
Coronary Artery Disease
Coronary artery disease is atherosclerosis specifically in the vessels feeding the heart. Its hallmark symptoms are chest pain (often described as pressure or tightness) and shortness of breath, both caused by the heart not receiving enough blood. Some people feel the pain in their jaw, neck, or left arm instead of their chest, and women are more likely to experience atypical symptoms like nausea or unusual fatigue.
Diagnosis typically starts with an electrocardiogram (ECG), which records the heart’s electrical activity, and blood tests. Depending on those results, further testing may include a stress test (monitoring the heart during exercise), an echocardiogram (an ultrasound of the heart), or a cardiac CT scan that can visualize plaque in the arteries directly.
Stroke: Two Different Causes
Stroke falls under CVD because it is fundamentally a blood vessel problem, just in the brain rather than the heart. About 87% of strokes are ischemic, meaning a clot blocks an artery supplying brain tissue. The clot may form locally or travel from elsewhere in the body. The remaining strokes are hemorrhagic, caused by a weakened blood vessel that ruptures and bleeds into the brain. Uncontrolled high blood pressure is the most common cause of hemorrhagic stroke, and structural problems like aneurysms (balloon-like bulges in vessel walls) also play a role.
Because the two types require opposite treatments (one needs blood flow restored, the other needs bleeding stopped), rapid diagnosis with brain imaging is critical when stroke symptoms appear.
Peripheral Artery Disease
When atherosclerosis affects the arteries in your legs, it causes peripheral artery disease (PAD). The classic symptom is leg pain during walking that goes away with rest, a pattern called claudication. You might feel it in the calf, thigh, hip, or buttock. But up to 4 in 10 people with PAD have no leg pain at all, which makes it easy to miss.
Other signs can be subtler: hair loss on the legs, smooth or shiny skin, skin that feels cool to the touch, slow-healing sores on the feet, or cold and numb toes. A simple, painless test called the ankle-brachial index compares blood pressure readings at your ankle and your arm. A significant difference suggests the leg arteries are narrowed.
Heart Failure
Heart failure does not mean the heart has stopped. It means the heart has become too weak or too stiff to pump blood efficiently. It often develops after other cardiovascular damage, such as a heart attack or years of uncontrolled high blood pressure, has worn the heart muscle down.
Doctors classify heart failure by ejection fraction, which is the percentage of blood the heart pushes out with each beat. A healthy heart ejects about 55% to 70%. Heart failure with reduced ejection fraction means the heart squeezes out 40% or less. Heart failure with preserved ejection fraction means the percentage looks normal (50% or above), but the heart muscle has become stiff and doesn’t fill properly between beats. Both types cause similar symptoms: shortness of breath, fatigue, and fluid buildup that can swell the ankles, legs, or abdomen.
Risk Factors You Can and Cannot Change
Some CVD risk factors are out of your control. Age, sex, family history, and genetics all influence your likelihood of developing heart or blood vessel problems. But the majority of cardiovascular disease is driven by modifiable factors, meaning choices and conditions you can address.
High blood pressure is the single biggest risk factor. Current guidelines classify blood pressure as normal below 120/80, elevated at 120 to 129 over less than 80, stage 1 hypertension at 130 to 139 over 80 to 89, and stage 2 hypertension at 140/90 or higher. High blood pressure forces the heart to work harder and damages artery walls, making them more vulnerable to plaque buildup.
Unhealthy cholesterol levels are the second major driver. When there is more LDL cholesterol than the body can use, the excess embeds in artery walls and fuels atherosclerosis. HDL cholesterol works in the opposite direction, helping to clear cholesterol from the bloodstream, which is why higher HDL levels are protective.
Diabetes significantly raises cardiovascular risk. Adults with diabetes have a higher rate of death from heart disease than those without it. Obesity contributes by raising LDL and triglyceride levels, lowering HDL, and increasing the odds of developing both high blood pressure and diabetes. Smoking damages blood vessels directly, nicotine raises blood pressure, and carbon monoxide from cigarette smoke reduces the oxygen your blood can carry. Excessive alcohol raises blood pressure and triglyceride levels.
Lowering Your Risk
Physical activity is one of the most effective tools for prevention. Current guidelines recommend at least 150 minutes per week of moderate-intensity exercise (like brisk walking) or 75 minutes of vigorous exercise (like running or cycling hard). Shorter bouts count just as much as longer ones, so three 10-minute walks throughout the day are as beneficial as one 30-minute session. Going beyond 300 minutes a week of moderate activity provides additional protection, and there appears to be no minimum threshold below which exercise stops being helpful.
Diet matters substantially. Plant-based and Mediterranean-style eating patterns, rich in vegetables, fruits, nuts, whole grains, legumes, and fish, are consistently linked to lower cardiovascular and overall mortality. On the other side of the equation, high intake of sodium (above 2,000 mg per day), red and processed meats, and sugar-sweetened beverages is associated with increased cardiovascular death. Even one daily serving of a sweetened beverage raises the risk of developing type 2 diabetes by about 20%, which in turn increases heart disease risk.
For people whose risk remains elevated despite lifestyle changes, cholesterol-lowering medications called statins are a cornerstone of prevention. They are typically recommended for adults 40 to 75 with LDL cholesterol at 190 mg/dL or above, those with diabetes, or those whose overall calculated risk is high enough to warrant treatment. The decision is usually made through a conversation with your doctor, weighing your individual numbers, health history, and preferences.
Controlling blood pressure, managing blood sugar if you have diabetes, maintaining a healthy weight, limiting alcohol, and not smoking round out the core prevention strategy. None of these steps works in isolation, but together they address the conditions that cause the vast majority of cardiovascular disease.