CVD stands for cardiovascular disease, an umbrella term for a group of disorders affecting the heart and blood vessels. It is the leading cause of death worldwide, and the term covers everything from coronary heart disease and stroke to less common conditions like congenital heart defects and blood clots in the legs.
Understanding what falls under CVD matters because the conditions share overlapping risk factors, and many are preventable with the same lifestyle changes. Here’s what the term actually includes and how these conditions develop.
Conditions That Fall Under CVD
When a doctor refers to CVD, they could be talking about any of the following:
- Coronary heart disease: Narrowing or blockage of the blood vessels that supply the heart muscle itself. This is what causes heart attacks.
- Cerebrovascular disease: Disease of the blood vessels supplying the brain. Strokes and transient ischemic attacks (mini-strokes) fall here.
- Peripheral arterial disease: Reduced blood flow to the arms and legs, most commonly the legs. This can cause pain while walking and, in severe cases, tissue damage.
- Rheumatic heart disease: Damage to the heart muscle and valves caused by rheumatic fever, which itself results from a strep bacterial infection. This is largely preventable with antibiotics but remains common in lower-income countries.
- Congenital heart disease: Structural defects in the heart that are present from birth. These range from minor holes between heart chambers to complex malformations that require surgery.
- Deep vein thrombosis and pulmonary embolism: Blood clots that form in leg veins and can break loose, traveling to the lungs where they block blood flow.
Coronary heart disease and cerebrovascular disease account for the vast majority of CVD deaths. The other conditions are less common but still fall under the same medical category.
How Most CVD Develops
The biological engine behind coronary heart disease, stroke, and peripheral arterial disease is a process called atherosclerosis. It begins earlier in life than most people realize.
In childhood and adolescence, small deposits of fat start collecting inside artery walls. These early deposits, called fatty streaks, are essentially immune cells that have absorbed fat droplets. At this stage, the streaks cause no symptoms and no harm. But over decades, they can grow. The small pools of fat merge into larger collections, and the artery wall thickens around them. Eventually, a fatty core forms beneath the inner lining of the artery, covered by a cap of fibrous tissue.
This buildup, called plaque, narrows the artery and restricts blood flow. The real danger comes when the fibrous cap becomes thin and inflamed. If it tears open, the body treats it like a wound and forms a blood clot at the site. That clot can partially or fully block the artery. When this happens in a coronary artery, it causes a heart attack. When it happens in an artery supplying the brain, it causes a stroke. In peripheral arteries (typically the legs), roughly 75% of arteries with significant narrowing show evidence of clots, and these clots can form even when the underlying plaque buildup is relatively minor.
Peripheral arterial disease also involves heavy calcium deposits in the vessel walls, which makes the arteries stiff and compounds the problem of reduced blood flow.
Risk Factors You Can and Can’t Control
CVD risk factors split into two categories: those you’re born with and those you can change.
The non-modifiable factors include age, sex, ethnicity, and family history. After age 40, the lifetime risk of developing coronary artery disease is 49% for men and 32% for women. Having a father or brother diagnosed before age 55, or a mother or sister diagnosed before age 65, also raises your risk significantly.
The modifiable factors carry more practical weight because they’re the ones you can actually do something about:
- High blood pressure: About 1 in 3 adults has high blood pressure, and it ranks alongside smoking as the modifiable factor responsible for the most deaths. Only about 54% of people with high blood pressure achieve adequate control. The extra mechanical and chemical stress on artery walls accelerates plaque formation.
- High cholesterol: Elevated cholesterol is the second most common risk factor for heart disease. High triglycerides also play a role, though their effect is harder to isolate because they tend to travel alongside other risk factors like insulin resistance and excess abdominal fat.
- Diabetes: Chronically elevated blood sugar damages blood vessel walls and promotes inflammation, speeding up atherosclerosis.
- Smoking: Chemicals in tobacco damage the inner lining of arteries, making it easier for plaque to take hold.
- Obesity, poor diet, and physical inactivity: These three tend to cluster together and collectively drive up blood pressure, cholesterol, and blood sugar.
- Chronic stress: Prolonged stress hormones raise blood pressure and promote inflammation in blood vessels.
Symptoms Differ Between Men and Women
The classic warning sign of a heart attack is chest pain or pressure. That applies to both men and women, but women are significantly more likely to experience less obvious symptoms: shortness of breath, nausea, back pain, abdominal discomfort, or indigestion, sometimes without any noticeable chest pain at all. These atypical symptoms are a major reason heart disease in women is underdiagnosed and undertreated.
For cerebrovascular disease, the warning signs of a stroke are sudden numbness or weakness (often on one side of the body), confusion, trouble speaking, vision changes, or a severe headache with no clear cause. These apply across sexes.
Peripheral arterial disease typically shows up as cramping or pain in the legs during walking that goes away with rest. As it progresses, the pain can occur even at rest, and wounds on the feet or legs may heal slowly or not at all.
How CVD Is Detected
Screening for cardiovascular disease often starts with routine checks you’ve probably already had: blood pressure readings and blood tests that measure cholesterol and blood sugar levels. These basic tests reveal the key drivers of atherosclerosis long before symptoms appear.
When a doctor suspects an active heart problem, the first-line test is usually an electrocardiogram (ECG or EKG). It’s painless and takes only a few minutes. Small sensors placed on your chest and limbs record your heart’s electrical activity, showing how fast it’s beating, whether the rhythm is regular, and whether the electrical signals are traveling through the heart normally. An ECG can reveal evidence of a current or past heart attack, irregular heart rhythms, and signs that the heart muscle is under strain.
Beyond the ECG, imaging tests like echocardiograms (ultrasound of the heart), stress tests (monitoring your heart during exercise), and CT scans that measure calcium buildup in coronary arteries help doctors gauge how advanced the disease is and which blood vessels are affected. The specific tests ordered depend on your symptoms, risk profile, and what the initial screening reveals.