The most telling sign of a heart attack is chest pain or discomfort that lasts more than a few minutes, often described as pressure, squeezing, or fullness in the center or left side of the chest. But not every heart attack feels that way. Some cause symptoms so mild that people mistake them for the flu, heartburn, or a pulled muscle. Knowing what to look for, including the less obvious signs, can save your life or someone else’s.
The Most Common Symptoms
Heart attacks happen when a buildup of cholesterol-based plaque inside a coronary artery ruptures or blocks blood flow, cutting off oxygen to part of the heart muscle. Permanent damage to that muscle can begin in as little as 30 minutes, which is why recognizing symptoms quickly matters so much.
The classic symptoms include:
- Chest pressure or pain in the center or left side that lasts more than a few minutes, or fades and returns
- Pain radiating to the arms, jaw, neck, or back, often the left arm but sometimes both
- Shortness of breath, which can occur with or without chest discomfort
- Cold sweat that comes on suddenly and isn’t related to exertion or heat
- Nausea, lightheadedness, or sudden dizziness
The chest sensation doesn’t always feel like sharp, dramatic pain. Many people describe it as a heavy weight sitting on their chest, a tight squeezing, or an uncomfortable fullness. It can come and go in waves rather than staying constant.
How Symptoms Differ in Women
Women are more likely than men to experience heart attack symptoms that don’t match the textbook picture. Sweating, nausea, dizziness, and unusual fatigue are common in women and may occur while resting or even during sleep. Other symptoms women report include pain in the lower chest or upper abdomen, back or jaw pain, and extreme fatigue that feels disproportionate to any activity.
Because these symptoms are vague, women are more likely to delay seeking help. A woman having a heart attack might assume she has a stomach bug or is just exhausted. If these symptoms come on suddenly, feel different from anything you’ve experienced before, or cluster together, treat them seriously.
Heart Attack vs. Heartburn vs. Panic Attack
Even experienced doctors sometimes can’t tell these apart based on symptoms alone, so don’t try to diagnose yourself at home. That said, some patterns can help you gauge what’s happening.
Heartburn typically causes a burning sensation in the chest or upper abdomen, often after eating or while lying down. It usually responds to antacids and may come with a sour taste in your mouth or a small amount of stomach contents rising into your throat. Heart attack pain, by contrast, feels more like pressure or squeezing than burning, tends to radiate outward to the arms, jaw, or back, and often comes with shortness of breath or cold sweats.
Panic attacks can also cause chest tightness and shortness of breath, but they typically peak within 10 minutes and are accompanied by a racing heart, tingling in the hands, and an intense feeling of fear or doom. The key difference: if your chest discomfort came on during physical exertion, spreads to your arm or jaw, or is accompanied by cold sweats, those signs point more toward a cardiac event than anxiety. When in doubt, call 911. A false alarm at the emergency room is always better than a missed heart attack.
Silent Heart Attacks
Roughly 1 in 5 heart attacks produce no obvious symptoms at all. These “silent” heart attacks still damage the heart muscle, but the person experiencing one might feel nothing more than flu-like achiness, mild indigestion, a sore feeling in the chest or upper back, unexplained jaw or arm discomfort, or deep fatigue. Many people only learn they had a silent heart attack weeks or months later, when a routine test reveals the damage.
Silent heart attacks are more common in people with diabetes, partly because nerve damage from diabetes can blunt the pain signals your heart would normally send. They also appear to be more common in women. If you fall into either category and notice even vague, unexplained symptoms like those listed above, it’s worth getting checked.
Warning Signs Days or Weeks Before
Heart attacks don’t always strike without warning. Research published in the American Heart Association’s journal Circulation found that at least half of people who experienced a sudden cardiac event had warning symptoms in the four weeks beforehand. These early signs often include unusual fatigue, anxiety, flu-like feelings, chest tightness (especially with exertion), and shortness of breath that seems new or worsening.
These warning signs are easy to dismiss individually. Feeling tired for a few days doesn’t mean a heart attack is coming. But if you notice a new pattern of fatigue combined with chest discomfort during activity, or breathlessness that you can’t explain, those are signals your heart may not be getting enough blood flow.
What to Do If You Suspect a Heart Attack
Call 911 immediately. Do not drive yourself to the hospital. About half of people who die from heart attacks die within the first hour of their initial symptoms, and the chance of surviving improves dramatically when treatment begins within that 60-minute “golden hour.” Every minute of delay means more heart muscle is permanently lost.
While waiting for emergency services, sit or lie down in a comfortable position. If a 911 operator or your doctor has previously told you to take aspirin during a suspected heart attack, chew one to help slow blood clotting. Do not take aspirin on your own without that guidance, and never delay calling 911 in order to take one first.
What Happens at the Hospital
The first test you’ll receive is an electrocardiogram, often within minutes of arrival. This measures the electrical activity of your heart and can show whether a heart attack is in progress. You’ll also have blood drawn to check for a protein called troponin, which leaks into the bloodstream when heart muscle cells are dying. Troponin levels are one of the most reliable markers of heart damage, and doctors typically recheck them over several hours to track changes.
These two tests together, the electrical reading and the blood protein levels, give doctors a clear picture of whether you’re having a heart attack and how much muscle is affected. From there, treatment focuses on restoring blood flow to the blocked artery as quickly as possible, because the sooner flow returns, the more heart muscle can be saved.