Cardiovascular diseases are a group of conditions affecting the heart and blood vessels. They are the leading cause of death worldwide, killing an estimated 19.8 million people in 2022 alone, which accounts for roughly 32% of all deaths globally. The term is broad, covering everything from coronary artery disease and stroke to heart failure and peripheral artery disease. What connects them is a shared set of risk factors and, in most cases, a common underlying process: the gradual buildup of fatty deposits inside artery walls.
How Artery Damage Develops
Most cardiovascular diseases trace back to atherosclerosis, a slow process where arteries stiffen and narrow over years or decades. It starts when LDL cholesterol (the “bad” cholesterol) seeps into the inner lining of an artery wall, where it gets trapped and undergoes chemical changes, primarily oxidation. This modified cholesterol triggers the immune system. White blood cells rush to the site, swallow the cholesterol, and become bloated “foam cells” that pile up inside the artery wall.
Over time, these foam cells die, releasing their fatty contents into a growing mass called a necrotic core. The artery wall thickens around this core, and a fibrous cap forms over it. If that cap stays intact, blood flow is merely restricted. If it ruptures, a blood clot forms suddenly, which can block the artery entirely. Depending on where this happens, the result is a heart attack, a stroke, or a loss of blood flow to the legs.
Coronary Artery Disease
Coronary artery disease (CAD) is the most common type of cardiovascular disease. It occurs when the arteries supplying blood to the heart muscle become narrowed or blocked by plaque buildup. The hallmark symptom is chest pain or tightness, often triggered by physical exertion or stress, along with shortness of breath.
What makes CAD particularly dangerous is how quietly it can progress. According to Mayo Clinic data, about half of people with CAD discover it only when they have a heart attack. For roughly one in four, the very first sign is sudden cardiac death. This is why screening matters even when you feel fine. Common screening and diagnostic tools include blood tests for cholesterol and blood sugar, electrocardiograms that detect abnormal heart rhythms or signs of past damage, echocardiograms that use sound waves to visualize blood flow through the heart, and exercise stress tests for people whose symptoms appear during physical activity.
Stroke: Two Different Causes
A stroke happens when blood flow to part of the brain is cut off, killing brain cells within minutes. There are two main types, and they work in opposite ways.
Ischemic strokes, which account for about 87% of all strokes, occur when a clot blocks an artery supplying the brain. This is essentially the same process as a heart attack, just in a different location. The clot may form locally or travel from elsewhere in the body.
Hemorrhagic strokes make up the remaining 13% and happen when a blood vessel in the brain ruptures. The bleeding itself damages brain tissue, but the pressure that builds up around the bleed causes additional harm. Hemorrhagic strokes are less common but tend to be more deadly.
Heart Failure
Heart failure does not mean the heart has stopped. It means the heart can no longer pump blood efficiently enough to meet the body’s needs. It typically develops gradually, often as the end result of other cardiovascular conditions like coronary artery disease or long-standing high blood pressure that forces the heart to work harder until it weakens.
The American Heart Association classifies heart failure into four stages. Stage A includes people who are at risk due to conditions like high blood pressure, diabetes, or obesity but have no symptoms or structural heart changes yet. Stage B describes people who have detectable structural changes in the heart, such as thickened walls or increased filling pressures, but still feel normal. Stage C is when symptoms appear: fatigue, shortness of breath, fluid retention, and reduced ability to exercise. Stage D is advanced heart failure, where symptoms are severe enough to interfere with daily life or require hospitalization.
The important thing about this staging system is that stages A and B represent a window where aggressive management of risk factors can prevent the condition from ever becoming symptomatic.
Peripheral Artery Disease
Peripheral artery disease (PAD) is atherosclerosis in the arteries of the legs and feet. The classic symptom is leg pain during walking that goes away with rest, a pattern called claudication. This pain can show up in the calves, thighs, hips, or buttocks. Other physical signs include hair loss on the legs, smooth and shiny skin, cool skin on the feet, weak or absent foot pulses, and sores on the legs or feet that heal slowly or not at all.
Up to 4 in 10 people with PAD have no leg pain at all, which means the disease often goes undetected. A simple test called the ankle-brachial index compares blood pressure in your ankles to blood pressure in your arms. A significant difference between the two suggests reduced blood flow to the legs. PAD also serves as a warning sign: if plaque is building up in your leg arteries, it is very likely building up in your heart and brain arteries too.
High Blood Pressure as a Driver
High blood pressure is both a cardiovascular disease in its own right and a primary driver of nearly every other type. It forces the heart to work harder and damages artery walls over time, accelerating plaque buildup.
The 2025 guidelines from the American Heart Association define four blood pressure categories. Normal is below 120/80 mm Hg. Elevated is 120 to 129 systolic (the top number) with the bottom number still under 80. Stage 1 hypertension is 130 to 139 systolic or 80 to 89 diastolic. Stage 2 hypertension is 140 or higher systolic, or 90 or higher diastolic. If your readings fall into two different categories, the higher one applies.
High blood pressure rarely causes noticeable symptoms, which is why it is sometimes called the “silent killer.” Regular monitoring is the only reliable way to catch it.
Risk Factors You Can Control
The major modifiable risk factors for cardiovascular disease overlap heavily across all types: high blood pressure, high LDL cholesterol, smoking, diabetes, obesity, physical inactivity, and poor diet. Addressing even a few of these meaningfully reduces your overall risk.
The American Heart Association recommends at least 150 minutes of moderate physical activity per week. For context, that is about 30 minutes five days a week of brisk walking, cycling, or swimming. On the dietary side, the evidence-based guidance focuses on patterns rather than individual nutrients: eat plenty of fruits and vegetables, choose whole grains, favor plant-based proteins along with fish and lean poultry, use liquid plant oils instead of solid fats, minimize added sugars and salt, limit alcohol, and choose minimally processed foods over packaged ones. These recommendations apply whether you cook at home or eat out.
What matters most is consistency over time. Cardiovascular disease develops over decades, and the same is true of prevention. Small, sustained changes in how you eat and move compound into significant protection over years.