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A heart attack happens when the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can’t get oxygen. If blood flow isn’t restored quickly, the section of heart muscle begins to die.
Heart attack treatment works best when it’s given right after symptoms occur. If you think you or someone else is having a heart attack, even if you’re not sure, call 911 right away.
Figure A is an overview of a heart and coronary artery showing damage (dead heart muscle) caused by a heart attack. Figure B is a cross-section of the coronary artery with plaque buildup and a blood clot.
Source: National Heart, Lung, and Blood Institute; National Institutes of Health; U.S. Department of Health and Human Services.
Certain risk factors make it more likely that you’ll develop coronary heart disease (CHD) and have a heart attack. You can control many of these risk factors.
Risk Factors You Can Control
The major risk factors for a heart attack that you can control include:
An unhealthy diet (for example, a diet high in saturated fat, trans fat, cholesterol, and sodium)
Lack of routine physical activity
High blood sugar due to insulin resistance or diabetes
Some of these risk factors—such as obesity, high blood pressure, and high blood sugar—tend to occur together. When they do, it’s called metabolic syndrome.
In general, a person who has metabolic syndrome is twice as likely to develop heart disease and five times as likely to develop diabetes as someone who doesn’t have metabolic syndrome.
For more information about the risk factors that are part of metabolic syndrome, go to the Health Topics Metabolic Syndrome article.
Risk Factors You Can’t Control
Risk factors that you can’t control include:
Age. The risk of heart disease increases for men after age 45 and for women after age 55 (or after menopause).
Family history of early heart disease. Your risk increases if your father or a brother was diagnosed with heart disease before 55 years of age, or if your mother or a sister was diagnosed with heart disease before 65 years of age.
Preeclampsia (pre-e-KLAMP-se-ah). This condition can develop during pregnancy. The two main signs of preeclampsia are a rise in blood pressure and excess protein in the urine. Preeclampsia is linked to an increased lifetime risk of heart disease, including CHD, heart attack, heart failure, and high blood pressure.
A heart attack happens if the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can’t get oxygen. Most heart attacks occur as a result of coronary heart disease (CHD).
CHD is a condition in which a waxy substance called plaque builds up inside of the coronary arteries. These arteries supply oxygen-rich blood to your heart.
When plaque builds up in the arteries, the condition is called atherosclerosis. The buildup of plaque occurs over many years.
Eventually, an area of plaque can rupture (break open) inside of an artery. This causes a blood clot to form on the plaque’s surface. If the clot becomes large enough, it can mostly or completely block blood flow through a coronary artery.
If the blockage isn’t treated quickly, the portion of heart muscle fed by the artery begins to die. Healthy heart tissue is replaced with scar tissue. This heart damage may not be obvious, or it may cause severe or long-lasting problems.
A less common cause of heart attack is a severe spasm (tightening) of a coronary artery. The spasm cuts off blood flow through the artery. Spasms can occur in coronary arteries that aren’t affected by atherosclerosis.
What causes a coronary artery to spasm isn’t always clear. A spasm may be related to:
Taking certain drugs, such as cocaine
Emotional stress or pain
Exposure to extreme cold
Not all heart attacks begin with the sudden, crushing chest pain that often is shown on TV or in the movies. In one study, for example, one-third of the patients who had heart attacks had no chest pain. These patients were more likely to be older, female, or diabetic.
The symptoms of a heart attack can vary from person to person. Some people can have few symptoms and are surprised to learn they’ve had a heart attack. If you’ve already had a heart attack, your symptoms may not be the same for another one. It is important for you to know the most common symptoms of a heart attack and also remember these facts:
Heart attacks can start slowly and cause only mild pain or discomfort. Symptoms can be mild or more intense and sudden. Symptoms also may come and go over several hours.
People who have high blood sugar (diabetes) may have no symptoms or very mild ones.
The most common symptom, in both men and women, is chest pain or discomfort.
Women are somewhat more likely to have shortness of breath, nausea and vomiting, unusual tiredness (sometimes for days), and pain in the back, shoulders, and jaw.
Some people don’t have symptoms at all. Heart attacks that occur without any symptoms or with very mild symptoms are called silent heart attacks.
The most common warning symptoms of a heart attack for both men and women are:
Chest pain or discomfort. Most heart attacks involve discomfort in the center or left side of the chest. The discomfort usually lasts for more than a few minutes or goes away and comes back. It can feel like pressure, squeezing, fullness, or pain. It also can feel like heartburn or indigestion. The feeling can be mild or severe.
Upper body discomfort. You may feel pain or discomfort in one or both arms, the back, shoulders, neck, jaw, or upper part of the stomach (above the belly button).
Shortness of breath. This may be your only symptom, or it may occur before or along with chest pain or discomfort. It can occur when you are resting or doing a little bit of physical activity.
The symptoms of angina (an-JI-nuh or AN-juh-nuh) can be similar to the symptoms of a heart attack. Angina is chest pain that occurs in people who have coronary heart disease, usually when they’re active. Angina pain usually lasts for only a few minutes and goes away with rest.
Chest pain or discomfort that doesn’t go away or changes from its usual pattern (for example, occurs more often or while you’re resting) can be a sign of a heart attack.
All chest pain should be checked by a doctor.
Other Common Signs and Symptoms
Pay attention to these other possible symptoms of a heart attack:
Breaking out in a cold sweat
Feeling unusually tired for no reason, sometimes for days (especially if you are a woman)
Nausea (feeling sick to the stomach) and vomiting
Light-headedness or sudden dizziness
Any sudden, new symptoms or a change in the pattern of symptoms you already have (for example, if your symptoms become stronger or last longer than usual)
Not everyone having a heart attack has typical symptoms. If you’ve already had a heart attack, your symptoms may not be the same for another one. However, some people may have a pattern of symptoms that recur.
The more signs and symptoms you have, the more likely it is that you’re having a heart attack.
Quick Action Can Save Your Life: Call 911
The signs and symptoms of a heart attack can develop suddenly. However, they also can develop slowly—sometimes within hours, days, or weeks of a heart attack.
Any time you think you might be having heart attack symptoms or a heart attack, don’t ignore it or feel embarrassed to call for help. Call 911 for emergency medical care, even if you are not sure whether you’re having a heart attack. Here’s why:
Acting fast can save your life.
An ambulance is the best and safest way to get to the hospital. Emergency medical services (EMS) personnel can check how you are doing and start life-saving medicines and other treatments right away. People who arrive by ambulance often receive faster treatment at the hospital.
The 911 operator or EMS technician can give you advice. You might be told to crush or chew an aspirin if you’re not allergic, unless there is a medical reason for you not to take one. Aspirin taken during a heart attack can limit the damage to your heart and save your life.
Every minute matters. Never delay calling 911 to take aspirin or do anything else you think might help.
Early treatment for a heart attack can pr event or limit damage to the heart muscle. Acting fast, by calling 911 at the first symptoms of a heart attack, can save your life. Medical personnel can begin diagnosis and treatment even before you get to the hospital.
Certain treatments usually are started right away if a heart attack is suspected, even before the diagnosis is confirmed. These include:
Aspirin to prevent further blood clotting
Nitroglycerin to reduce your heart’s workload and improve blood flow through the coronary arteries
Treatment for chest pain
Once the diagnosis of a heart attack is confirmed or strongly suspected, doctors start treatments promptly to try to restore blood flow through the blood vessels supplying the heart. The two main treatments are clot-busting medicines and percutaneous coronary intervention, also known as coronary angioplasty, a procedure used to open blocked coronary arteries.
Thrombolytic medicines, also called clot busters, are used to dissolve blood clots that are blocking the coronary arteries. To work best, these medicines must be given within several hours of the start of heart attack symptoms. Ideally, the medicine should be given as soon as possible.
Percutaneous coronary intervention is a nonsurgical procedure that opens blocked or narrowed coronary arteries. A thin, flexible tube (catheter) with a balloon or other device on the end is threaded through a blood vessel, usually in the groin (upper thigh), to the narrowed or blocked coronary artery. Once in place, the balloon located at the tip of the catheter is inflated to compress the plaque and related clot against the wall of the artery. This restores blood flow through the artery. During the procedure, the doctor may put a small mesh tube called a stent in the artery. The stent helps to keep the blood vessel open to prevent blockages in the artery in the months or years after the procedure.
Other Treatments for Heart Attack
Other treatments for heart attack include:
Your doctor may prescribe one or more of the following medicines.
ACE inhibitors. ACE inhibitors lower blood pressure and reduce strain on your heart. They also help slow down further weakening of the heart muscle.
Anticlotting medicines. Anticlotting medicines stop platelets from clumping together and forming unwanted blood clots. Examples of anticlotting medicines include aspirin and clopidogrel.
Anticoagulants. Anticoagulants, or blood thinners, prevent blood clots from forming in your arteries. These medicines also keep existing clots from getting larger.
Beta blockers. Beta blockers decrease your heart’s workload. These medicines also are used to relieve chest pain and discomfort and to help prevent another heart attack. Beta blockers also are used to treat arrhythmias (irregular heartbeats).
Statin medicines. Statins control or lower your blood cholesterol. By lowering your blood cholesterol level, you can decrease your chance of having another heart attack or stroke.
You also may be given medicines to relieve pain and anxiety, and treat arrhythmias. 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.
Coronary artery bypass grafting also may be used to treat a heart attack. During coronary artery bypass grafting, a surgeon removes a healthy artery or vein from your body. The artery or vein is then connected, or grafted, to bypass the blocked section of the coronary artery. The grafted artery or vein bypasses (that is, goes around) the blocked portion of the coronary artery. This provides a new route for blood to flow to the heart muscle.
Treatment for a heart attack usually includes making heart-healthy lifestyle changes. Your doctor also may recommend:
Aiming for healthy weight
Taking these steps can lower your chances of having another heart attack.
Your doctor may recommend cardiac rehabilitation (cardiac rehab) to help you recover from a heart attack and to help prevent another heart attack. Nearly everyone who has had a heart attack can benefit from rehab. Cardiac rehab is a medically supervised program that may help improve the health and well-being of people who have heart problems.
The cardiac rehab team may include doctors, nurses, exercise specialists, physical and occupational therapists, dietitians or nutritionists, and psychologists or other mental health specialists.
Rehab has two parts:
Education, counseling, and training. This part of rehab helps you understand your heart condition and find ways to reduce your risk for future heart problems. The rehab team will help you learn how to cope with the stress of adjusting to a new lifestyle and how to deal with your fears about the future.
Exercise training. This part helps you learn how to exercise safely, strengthen your muscles, and improve your stamina. Your exercise plan will be based on your personal abilities, needs, and interests.
Lowering your risk factors for coronary heart disease can help you prevent a heart attack. Even if you already have coronary heart disease, you still can take steps to lower your risk for a heart attack. These steps involve making heart-healthy lifestyle changes and getting ongoing medical care for related conditions that make heart attack more likely. Talk to your doctor about whether you may benefit from aspirin primary prevention, or using aspirin to help prevent your first heart attack.
A heart-healthy lifestyle can help prevent a heart attack and includes heart-healthy eating, being physically active, quitting smoking, managing stress, and managing your weight.
Treating conditions that make a heart attack more likely also can help lower your risk for a heart attack. These conditions may include:
Diabetes (high blood sugar). If you have diabetes, try to control your blood sugar level through diet and physical activity (as your doctor recommends). If needed, take medicine as prescribed.
High blood cholesterol. Your doctor may prescribe a statin medicine to lower your cholesterol if diet and exercise aren’t enough.
High blood pressure. Your doctor may prescribe medicine to keep your blood pressure under control.
Chronic kidney disease. Your doctor may prescribe medicines to control your high blood pressure or high blood sugar levels.
Peripheral artery disease. Your doctor may recommend surgery or procedures to unblock the affected arteries.
Have an Emergency Action Plan
Make sure that you have an emergency action plan in case you or someone in your family has a heart attack. This is very important if you’re at high risk for, or have already had, a heart attack.
Write down a list of medicines you are taking, medicines you are allergic to, your health care provider’s phone numbers (both during and after office hours), and contact information for a friend or relative. Keep the list in a handy place (for example, fill out this wallet card) to share in a medical emergency.
Talk with your doctor about the signs and symptoms of a heart attack, when you should call 9–1–1, and steps you can take while waiting for medical help to arrive.
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Learn more about participating in a clinical trial.
View all trials from ClinicalTrials.govexternal link .
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Cigarette and Tobacco Factsexternal link  (National Institute on Drug Abuse)
Coronary Artery Disease (MedlinePlus)
National Heart, Lung, and Blood Institute; National Institutes of Health; U.S. Department of Health and Human Services.
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