The major risk factors for cardiovascular disease fall into two categories: those you can change and those you cannot. The modifiable list includes high blood pressure, high cholesterol, smoking, diabetes, obesity, physical inactivity, and poor diet. The non-modifiable list includes age, biological sex, family history, and genetics. Beyond these well-established factors, sleep quality, chronic stress, air pollution, and certain pregnancy-related conditions also independently raise your risk.
High Blood Pressure
Persistently elevated blood pressure damages artery walls over time, making them stiffer and more prone to plaque buildup. A reading at or above 130/80 mmHg is considered high. Blood pressure is often called a “silent” risk factor because it rarely causes noticeable symptoms until significant damage has occurred, which is why routine screening matters. It is the single most common modifiable risk factor worldwide.
High Cholesterol and Triglycerides
When levels of LDL (“bad”) cholesterol are too high, fatty deposits accumulate inside artery walls and narrow the space available for blood flow. Low levels of HDL (“good”) cholesterol compound the problem because HDL helps clear excess cholesterol from the bloodstream. Triglycerides, another type of blood fat, add independent risk when they climb above 150 mg/dL. Together, abnormal blood fat levels are one of the strongest predictors of heart attack and stroke.
Smoking
Smoking damages the lining of blood vessels, raises blood pressure, and makes blood more likely to clot. In people with type 2 diabetes, smoking is the single strongest predictor of death, outpacing even poorly controlled blood sugar. Quitting reverses much of the damage over time: within a few years, a former smoker’s cardiovascular risk drops substantially, though it takes roughly 10 to 15 years to approach the risk level of someone who never smoked.
Diabetes and High Blood Sugar
People with type 2 diabetes face two to four times the risk of heart attack, stroke, and cardiovascular death compared to the general population. Chronically elevated blood sugar damages small and large blood vessels alike, accelerating plaque formation and stiffening arteries. Poorly controlled blood sugar is the strongest predictor of stroke and heart attack among people with diabetes.
The encouraging finding is that managing blood sugar, blood pressure, cholesterol, weight, and smoking together can nearly erase the excess risk. A large study published in the New England Journal of Medicine found that patients with diabetes who kept all five of those variables within target ranges had essentially the same risk of heart attack and stroke as people without diabetes.
Obesity and Waist Circumference
Carrying excess weight, particularly around the midsection, strains the heart and promotes inflammation, insulin resistance, and abnormal cholesterol levels. Waist circumference is a more telling measure than body weight alone. The American Heart Association flags a waist measurement greater than 40 inches in men or 35 inches in women as a marker of elevated risk. Abdominal fat is metabolically active tissue that releases inflammatory signals contributing directly to artery damage.
Physical Inactivity and Sedentary Time
Too little movement raises your risk, but the total hours you spend sitting each day matter independently. Research from the American College of Cardiology found that spending more than about 10.6 hours per day sedentary is linked to significantly higher rates of heart failure and cardiovascular death, even among people who meet recommended exercise guidelines. Below that threshold, risk increases only modestly. This means regular workouts help, but they do not fully cancel out a day spent almost entirely in a chair.
Staying under 10 to 10.5 hours of total sedentary time per day appears to be a realistic minimum target for better heart health. Breaking up long sitting stretches with short walks or standing intervals can help you get there.
Poor Diet and Trans Fats
Dietary choices influence nearly every other risk factor on this list. High sodium intake raises blood pressure, excess added sugars contribute to weight gain and insulin resistance, and diets low in fruits, vegetables, and whole grains deprive the body of protective nutrients.
Trans fats deserve special attention. On a per-calorie basis, trans fats raise heart disease risk more than any other type of fat. The Nurses’ Health Study found that heart disease risk roughly doubled for every 2% increase in calories from trans fats replacing carbohydrate calories. Denmark demonstrated the real-world impact of reducing trans fat intake: cutting average consumption from 6 grams to 1 gram per day contributed to a 50% decrease in deaths from coronary heart disease over 20 years.
Age, Sex, and Family History
Risk climbs with age, particularly after 45 in men and 55 in women. This is partly because plaque accumulates over decades and partly because blood vessels gradually lose flexibility. Data from the Framingham Heart Study showed that cardiovascular risk behavior between ages 40 and 60 is a powerful predictor of how long a person lives after 65.
Family history matters as well. Having a parent or sibling who developed heart disease before age 55 (for a male relative) or 65 (for a female relative) puts you at higher baseline risk. Genetics influence how your body handles cholesterol, blood pressure regulation, and inflammation. These factors are not modifiable, but knowing about them helps guide how aggressively you and your doctor manage the factors you can control.
One striking Framingham finding: people who reached age 50 with optimal risk factors (cholesterol below 180 mg/dL, blood pressure under 120/80, non-smoker, non-diabetic) had only a 5 to 8% lifetime chance of developing cardiovascular disease. That near-immunity underscores how powerfully modifiable factors shape outcomes even when age and genetics are in play.
Metabolic Syndrome
Metabolic syndrome is not a single disease but a cluster of conditions that, taken together, sharply increase cardiovascular risk. You are diagnosed with it when you meet three or more of these five criteria:
- Waist circumference: greater than 40 inches (men) or 35 inches (women)
- Triglycerides: 150 mg/dL or higher
- HDL cholesterol: below 40 mg/dL (men) or below 50 mg/dL (women)
- Blood pressure: 130/85 mmHg or higher
- Fasting blood sugar: 100 mg/dL or higher
Each of these factors is a risk on its own, but the combination creates a compounding effect that accelerates artery damage and raises the likelihood of a heart attack or stroke well beyond what any single factor would predict.
Sleep Duration and Quality
Both too little and too much sleep are associated with cardiovascular risk, largely through their effect on inflammation. Sleeping fewer than six hours per night raises levels of C-reactive protein (CRP), a marker your body produces during inflammation and one of the most widely used predictors of future heart problems. Sleeping 10 hours or more per night is also linked to elevated CRP. The lowest-risk range is roughly six to nine hours.
Sleep quality matters alongside duration. Poor sleep quality combined with short sleep duration (under six hours) was significantly associated with CRP levels above 3 mg/L in women, a threshold that signals meaningful cardiovascular risk. Sleep deprivation acts as a physical stressor that disrupts immune regulation and amplifies the body’s inflammatory response.
Risk Factors Specific to Women
Several conditions tied to reproductive health independently raise a woman’s cardiovascular risk later in life. The CDC identifies these as notable factors:
- Early first period: before age 11
- Early menopause: before age 40
- Polycystic ovary syndrome (PCOS)
- Gestational diabetes: diabetes that develops during pregnancy
- Preeclampsia and other hypertensive disorders of pregnancy
- Preterm delivery or delivering a very low or very high birth weight baby
These conditions signal underlying metabolic or vascular vulnerabilities that persist long after pregnancy ends. A woman who had preeclampsia, for example, carries elevated heart disease risk for decades afterward and benefits from closer cardiovascular monitoring starting earlier in life.
Air Pollution and Environmental Exposures
Where you live and what you breathe affect your heart. Exposure to particulate matter, the tiny particles released by traffic, industry, and wildfires, increases the risk of cardiovascular disease and metabolic syndrome. Noise pollution adds an independent layer of risk, and the combined effect of air pollution and chronic noise exposure may be greater than either one alone. Socioeconomic factors like income, housing quality, and access to healthcare further modify how heavily environmental exposures translate into actual disease.