Coronary Heart Disease Risk Factors
Coronary heart disease risk factors are conditions or habits that raise your risk of coronary heart disease (CHD) and heart attack. These risk factors also increase the chance that existing CHD will worsen.
CHD, also called coronary artery disease, is a condition in which a waxy substance called plaque (plak) builds up on the inner walls of the coronary arteries. These arteries supply oxygen-rich blood to your heart muscle.
Plaque narrows the arteries and reduces blood flow to your heart muscle. Reduced blood flow can cause chest pain, especially when you're active. Eventually, an area of plaque can rupture (break open). This causes a blood clot to form on the surface of the plaque.
If the clot becomes large enough, it can block the flow of oxygen-rich blood to the portion of heart muscle fed by the artery. Blocked blood flow to the heart muscle causes a heart attack.
There are many known CHD risk factors. You can control some risk factors, but not others. Risk factors you can control include:
- High blood cholesterol and triglyceride levels (a type of fat found in the blood)
- High blood pressure
- Diabetes and prediabetes
- Overweight and obesity
- Lack of physical activity
- Unhealthy diet
The risk factors you can't control are age, gender, and family history of CHD.
Many people have at least one CHD risk factor. Your risk of CHD and heart attack increases with the number of risk factors you have and their severity. Also, some risk factors put you at greater risk of CHD and heart attack than others. Examples of these risk factors include smoking and diabetes.
Many risk factors for coronary heart disease start during childhood. This is even more common now because many children are overweight and don’t get enough physical activity.
Researchers continue to study and learn more about CHD risk factors.
Following a healthy lifestyle can help you and your children prevent or control many CHD risk factors.
Because many lifestyle habits begin during childhood, parents and families should encourage their children to make heart healthy choices. For example, you and your children can lower your risk of CHD if you maintain a healthy weight, follow a healthy diet, do physical activity regularly, and don't smoke.
If you already have CHD, lifestyle changes can help you control your risk factors. This may prevent CHD from worsening. Even if you're in your seventies or eighties, a healthy lifestyle can lower your risk of dying from CHD.
If lifestyle changes aren't enough, your doctor may recommend other treatments to help control your risk factors.
Your doctor can help you find out whether you have CHD risk factors. He or she also can help you create a plan for lowering your risk of CHD, heart attack, and other heart problems.
If you have children, talk with their doctors about their heart health and whether they have CHD risk factors. If they do, ask your doctor to help create a treatment plan to reduce or control these risk factors.
High Blood Cholesterol and Triglyceride Levels
High blood cholesterol is a condition in which your blood has too much cholesterol—a waxy, fat-like substance. The higher your blood cholesterol level, the greater your risk of coronary heart disease (CHD) and heart attack.
Cholesterol travels through the bloodstream in small packages called lipoproteins. Two major kinds of lipoproteins carry cholesterol throughout your body:
- Low-density lipoproteins (LDL). LDL cholesterol sometimes is called "bad" cholesterol. This is because it carries cholesterol to tissues, including your heart arteries. A high LDL cholesterol level raises your risk of CHD.
- High-density lipoproteins (HDL). HDL cholesterol sometimes is called "good" cholesterol. This is because it helps remove cholesterol from your arteries. A low HDL cholesterol level raises your risk of CHD.
Many factors affect your cholesterol levels. For example, after menopause, women's LDL cholesterol levels tend to rise, and their HDL cholesterol levels tend to fall. Other factors—such as age, gender, diet, and physical activity—also affect your cholesterol levels.
Healthy levels of both LDL and HDL cholesterol will prevent plaque from building up in your arteries. Routine blood tests can show whether your blood cholesterol levels are healthy. Talk with your doctor about having your cholesterol tested and what the results mean.
Children also can have unhealthy cholesterol levels, especially if they're overweight or their parents have high blood cholesterol. Talk with your child's doctor about testing your child' cholesterol levels.
To learn more about high blood cholesterol and how to manage the condition, go to the Health Topics High Blood Cholesterol article.
Triglycerides are a type of fat found in the blood. Some studies suggest that a high level of triglycerides in the blood may raise the risk of CHD, especially in women.
High Blood Pressure
"Blood pressure" is the force of blood pushing against the walls of your arteries as your heart pumps blood. If this pressure rises and stays high over time, it can damage your heart and lead to plaque buildup. All levels above 120/80 mmHg raise your risk of CHD. This risk grows as blood pressure levels rise. Only one of the two blood pressure numbers has to be above normal to put you at greater risk of CHD and heart attack.
Most adults should have their blood pressure checked at least once a year. If you have high blood pressure, you'll likely need to be checked more often. Talk with your doctor about how often you should have your blood pressure checked.
Children also can develop high blood pressure, especially if they're overweight. Your child's doctor should check your child's blood pressure at each routine checkup.
Both children and adults are more likely to develop high blood pressure if they're overweight or have diabetes.
For more information about high blood pressure and how to manage the condition, go to the Health Topics High Blood Pressure article.
Diabetes and Prediabetes
Diabetes is a disease in which the body's blood sugar level is too high. The two types of diabetes are type 1 and type 2.
In type 1 diabetes, the body's blood sugar level is high because the body doesn't make enough insulin. Insulin is a hormone that helps move blood sugar into cells, where it's used for energy. In type 2 diabetes, the body's blood sugar level is high mainly because the body doesn't use its insulin properly.
Over time, a high blood sugar level can lead to increased plaque buildup in your arteries. Having diabetes doubles your risk of CHD.
Prediabetes is a condition in which your blood sugar level is higher than normal, but not as high as it is in diabetes. If you have prediabetes and don't take steps to manage it, you'll likely develop type 2 diabetes within 10 years. You're also at higher risk of CHD.
Being overweight or obese raises your risk of type 2 diabetes. With modest weight loss and moderate physical activity, people who have prediabetes may be able to delay or prevent type 2 diabetes. They also may be able to lower their risk of CHD and heart attack. Weight loss and physical activity also can help control diabetes.
Even children can develop type 2 diabetes. Most children who have type 2 diabetes are overweight.
Type 2 diabetes develops over time and sometimes has no symptoms. Go to your doctor or local clinic to have your blood sugar levels tested regularly to check for diabetes and prediabetes.
For more information about diabetes and heart disease, go to the Health Topics Diabetic Heart Disease article. For more information about diabetes and prediabetes, go to the National Institute of Diabetes and Digestive and Kidney Diseases' (NIDDK's) Introduction to Diabetes.
Overweight and Obesity
The terms "overweight" and "obesity" refer to body weight that's greater than what is considered healthy for a certain height. More than two-thirds of American adults are overweight, and almost one-third of these adults are obese.
The most useful measure of overweight and obesity is body mass index (BMI). You can use the National Heart, Lung, and Blood Institute's (NHLBI's) online BMI calculator to figure out your BMI, or your doctor can help you.
Overweight is defined differently for children and teens than it is for adults. Children are still growing, and boys and girls mature at different rates. Thus, BMIs for children and teens compare their heights and weights against growth charts that take age and gender into account. This is called BMI-for-age percentile.
Being overweight or obese can raise your risk of CHD and heart attack. This is mainly because overweight and obesity are linked to other CHD risk factors, such as high blood cholesterol and triglyceride levels, high blood pressure, and diabetes.
For more information, go to the Health Topics Overweight and Obesity article.
Smoking tobacco or long-term exposure to secondhand smoke raises your risk of CHD and heart attack.
Smoking triggers a buildup of plaque in your arteries. Smoking also increases the risk of blood clots forming in your arteries. Blood clots can block plaque-narrowed arteries and cause a heart attack. Some research shows that smoking raises your risk of CHD in part by lowering HDL cholesterol levels.
The more you smoke, the greater your risk of heart attack. The benefits of quitting smoking occur no matter how long or how much you've smoked. Heart disease risk associated with smoking begins to decrease soon after you quit, and for many people it continues to decrease over time.
Most people who smoke start when they're teens. Parents can help prevent their children from smoking by not smoking themselves. Talk with your child about the health dangers of smoking and ways to overcome peer pressure to smoke.
Lack of Physical Activity
Inactive people are nearly twice as likely to develop CHD as those who are active. A lack of physical activity can worsen other CHD risk factors, such as high blood cholesterol and triglyceride levels, high blood pressure, diabetes and prediabetes, and overweight and obesity.
It's important for children and adults to make physical activity part of their daily routines. One reason many Americans aren't active enough is because of hours spent in front of TVs and computers doing work, schoolwork, and leisure activities.
Some experts advise that children and teens should reduce screen time because it limits time for physical activity. They recommend that children aged 2 and older should spend no more than 2 hours a day watching TV or using a computer (except for school work).
Being physically active is one of the most important things you can do to keep your heart healthy. The good news is that even modest amounts of physical activity are good for your health. The more active you are, the more you will benefit.
For more information, go to HHS' "2008 Physical Activity Guidelines for Americans," the Health Topics Physical Activity and Your Heart article, and the NHLBI's "Your Guide to Physical Activity and Your Heart."
An unhealthy diet can raise your risk of CHD. For example, foods that are high in saturated and trans fats and cholesterol raise LDL cholesterol. Thus, you should try to limit these foods.
It's also important to limit foods that are high in sodium (salt) and added sugars. A high-salt diet can raise your risk of high blood pressure.
Added sugars will give you extra calories without nutrients like vitamins and minerals. This can cause you to gain weight, which raises your risk of CHD. Added sugars are found in many desserts, canned fruits packed in syrup, fruit drinks, and nondiet sodas.
Stress and anxiety may play a role in causing CHD. Stress and anxiety also can trigger your arteries to tighten. This can raise your blood pressure and your risk of heart attack.
The most commonly reported trigger for a heart attack is an emotionally upsetting event, especially one involving anger. Stress also may indirectly raise your risk of CHD if it makes you more likely to smoke or overeat foods high in fat and sugar.
In men, the risk for coronary heart disease (CHD) increases starting around age 45. In women, the risk for CHD increases starting around age 55. Most people have some plaque buildup in their heart arteries by the time they’re in their 70s. However, only about 25 percent of those people have chest pain, heart attacks, or other signs of CHD.
Some risk factors may affect CHD risk differently in women than in men. For example, estrogen provides women some protection against CHD, whereas diabetes raises the risk of CHD more in women than in men.
Also, some risk factors for heart disease only affect women, such as preeclampsia, a condition that can develop during pregnancy. Preeclampsia is linked to an increased lifetime risk of heart disease, including CHD, heart attack, heart failure, and high blood pressure. (Likewise, having heart disease risk factors, such as diabetes or obesity, increases a woman’s risk of preeclampsia.)
A family history of early CHD is a risk factor for developing CHD, specifically if a father or brother is diagnosed before age 55, or a mother or sister is diagnosed before age 65.
You can prevent and control many coronary heart disease (CHD) risk factors with heart-healthy lifestyle changes and medicines. Examples of risk factors you can control include high blood cholesterol, high blood pressure, and overweight and obesity. Only a few risk factors—such as age, gender, and family history—can’t be controlled.
To reduce your risk of CHD and heart attack, try to control each risk factor you can. The good news is that many lifestyle changes help control several CHD risk factors at the same time. For example, physical activity may lower your blood pressure, help control diabetes and prediabetes, reduce stress, and help control your weight.
Heart-Healthy Lifestyle Changes
A heart-healthy lifestyle can lower the risk of CHD. If you already have CHD, a heart-healthy lifestyle may prevent it from getting worse. Heart-healthy lifestyle changes include:
Many lifestyle habits begin during childhood. Thus, parents and families should encourage their children to make heart-healthy choices, such as following a healthy diet and being physically active. Make following a healthy lifestyle a family goal. Making lifestyle changes can be hard. But if you make these changes as a family, it may be easier for everyone to prevent or control their CHD risk factors.
For tips on how to help your children adopt healthy habits, visit We Can!® Ways to Enhance Children’s Activity & Nutrition.
Sometimes lifestyle changes aren’t enough to control your blood cholesterol levels. For example, you may need statin medications to control or lower your cholesterol. By lowering your cholesterol level, you can decrease your chance of having a heart attack or stroke. Doctors usually prescribe statins for people who have:
- Coronary heart disease, peripheral artery disease, or had a prior stroke
- High LDL cholesterol levels
Doctors may discuss beginning statin treatment with those who have an elevated risk for developing heart disease or having a stroke
Your doctor also may prescribe other medications to:
- Decrease your chance of having a heart attack or dying suddenly.
- Lower your blood pressure.
- Prevent blood clots, which can lead to heart attack or stroke.
- Prevent or delay the need for a procedure or surgery, such as percutaneous coronary intervention or coronary artery bypass grafting.
- Reduce your heart’s workload and relieve CHD.
Take all medicines regularly, as your doctor prescribes. Don’t change the amount of your medicine or skip a dose unless your doctor tells you to. You should still follow a heart-healthy lifestyle, even if you take medicines to treat your CHD.
The National Heart, Lung, and Blood Institute (NHLBI) leads or sponsors many studies aimed at preventing, diagnosing, and treating heart, lung, blood, and sleep disorders.
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