Given the task definition and input, reply with output. Given a passage and a query based on the passage, generate an unambiguous, concise and simple answer to the query from information in the passage. Note that the answer may not be present in exact form.

A heart attack can happen to anyone, woman or man, young or old. Some people are more at risk because of certain health problems, family health history, age, and habits. These are called risk factors. You can't change some risk factors, like your age, race or ethnicity, or family history. A Month Before a Heart Attack, Your Body Will Warn You With These 8 Signals! - Duration: 6:24. 7ReMix Healthy Tips TV 189,400 views A heart attack occurs when one or more of your coronary arteries become blocked. Over time, a coronary artery can narrow from the buildup of various substances, including cholesterol (atherosclerosis). This condition, known as coronary artery disease, causes most heart attacks. Although a heart attack is a frightening event, if you learn the signs of a heart attack and what steps to take, you can save a lifeperhaps even your own. Many people think that heart attacks are a "man's problem," yet heart disease is actually the number one killer of both men and women in the United States. To diagnose a heart attack, an emergency care team will ask you about your symptoms and begin to evaluate you. The diagnosis of the heart attack is based on your symptoms and test results. The goal of treatment is to treat you quickly and limit heart muscle damage. Tests to Diagnose a Heart Attack. ECG . Symptoms of a heart attack may be immediate and intense. More often, though, symptoms start slowly and persist for hours, days or weeks before a heart attack. Unlike with sudden cardiac arrest, the heart usually does not stop beating during a heart attack. The heart attack symptoms in women can be different than men. What is cardiac arrest? About every 40 seconds, someone in the United States has a myocardial infarction (heart attack). Your heart muscle needs oxygen to survive. A heart attack occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely (View an animation of blood flow). Several studies have demonstrated that there is seasonal variation in heart attacks. They are most likely to occur in the winter, and least likely to occur in the summer. This is not just true for heart attacks, but also other cardiovascular events. Several explanations have been proposed. Heart attacks may seem like a senior citizen phenomenon, considering that about 82% of people who die of coronary heart disease are at least 65, according to the American Heart Association. But sudden heart problems can occur much earlier in life, too. Every 40 seconds, someone in the United States has a heart attack. 1. A heart attack, also called a myocardial infarction, occurs when a part of the heart muscle doesn't receive enough blood flow. The more time that passes without treatment to restore blood flow, the greater the damage to the heart muscle. Query: how does a heart attack occur
A heart attack occurs when one or more of your coronary arteries become blocked.