Heart Attack Symptoms and Treatment: A Complete Guide
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
TL;DR
A heart attack (medical name: myocardial infarction) happens when blood flow to the heart is severely reduced or blocked, usually by plaques — fatty, cholesterol-rich deposits that build up in the heart (coronary) arteries through a process called atherosclerosis. When a plaque ruptures, a clot can form and cut off blood flow; each minute without treatment, more heart muscle is damaged or dies. Watch for 9 symptoms: chest pain (pressure, tightness, squeezing), pain spreading to the shoulder, arm, back, neck, jaw or upper belly, cold sweat, fatigue, heartburn-like discomfort, lightheadedness, loss of consciousness, nausea, and shortness of breath. For women, older adults, and people with diabetes, symptoms may feel unrelated — like nausea or a brief neck or back pain. If you suspect a heart attack, call 911 immediately — do not delay to take aspirin, and do not drive yourself. Doctors diagnose with an ECG, cardiac blood markers, chest X-ray, echocardiogram, and angiogram or cardiac CT/MRI, then treat with medicines like aspirin, clot busters, nitroglycerin, beta blockers, and statins, plus procedures such as angioplasty with stenting or coronary artery bypass surgery. Afterward, cardiac rehabilitation helps survivors live longer, and lifestyle steps — no smoking, heart-healthy eating, exercise, and managing blood pressure, cholesterol, and blood sugar — reduce the chance of another attack.
Quick Answer: What You Need to Know About Heart Attack
Who is this for? Anyone who feels chest pressure, unexplained shortness of breath, cold sweat, or pain radiating to the arm, back, neck or jaw — and anyone over about age 45 or with risk factors like high blood pressure or diabetes who wants to know their warning signs.
What it is: Blood flow to the heart severely reduced or blocked, most often by cholesterol plaques that rupture and form a clot
Medical name: Myocardial infarction; the plaque-buildup process is called atherosclerosis
Most common symptom: Chest pain — pressure, tightness, squeezing, or aching
Atypical presentations: Women, older adults, and people with diabetes may feel nausea, fatigue, or a brief neck or back pain instead
What to do first: Call 911 immediately — don’t drive yourself, and don’t delay the call to take aspirin
How it’s diagnosed: ECG first, then cardiac blood markers, chest X-ray, echocardiogram, and angiogram or cardiac CT/MRI
How it’s treated: Aspirin, clot busters, nitroglycerin, beta blockers, and statins, plus angioplasty with stenting or bypass surgery, followed by cardiac rehabilitation
Source currency note: this article is based on clinical information from the source pages, dated March 27, 2026.
What Is a Heart Attack?
A heart attack occurs when the flow of blood to the heart is severely reduced or blocked. The blockage is usually due to a buildup of fat, cholesterol and other substances in the heart (coronary) arteries. These fatty, cholesterol-containing deposits are called plaques, and the process of plaque buildup is called atherosclerosis.
Sometimes a plaque ruptures and forms a clot that blocks blood flow. The lack of blood flow can damage or destroy part of the heart muscle. A heart attack is also called a myocardial infarction — “myocardial” referring to the heart muscle and “infarction” referring to tissue death from blocked blood supply.
One point deserves to be stated plainly: prompt treatment is needed for a heart attack to prevent death. Each minute after a heart attack, more heart tissue is damaged or dies. That is why the single most important action is calling 911 or your local emergency number immediately.
How a Heart Attack Develops
Coronary artery disease causes most heart attacks. In coronary artery disease, one or more of the heart (coronary) arteries are blocked, usually due to cholesterol-containing plaques. Plaques narrow the arteries, reducing blood flow to the heart. If a plaque breaks open, it can cause a blood clot in the heart.
A heart attack may be caused by a complete or partial blockage of a heart (coronary) artery. Doctors often use an electrocardiogram (ECG or EKG) — a test that records the heart’s electrical signals — to describe two main types:
Type | What it means |
STEMI (ST elevation myocardial infarction) | An acute complete blockage of a medium or large heart artery, requiring emergency invasive treatment |
NSTEMI (non-ST elevation myocardial infarction) | Usually a partial blockage — though some people with NSTEMI have a total blockage |
Not all heart attacks are caused by blocked arteries. Other causes include a coronary artery spasm (a severe squeezing of a blood vessel that is not blocked, also known as Prinzmetal’s angina, vasospastic angina, or variant angina), certain infections such as COVID-19 and other viral infections that can damage the heart muscle, and spontaneous coronary artery dissection (SCAD) — a life-threatening tear inside a heart artery.
What Are the Symptoms of a Heart Attack?
Symptoms of a heart attack vary. Some people have mild symptoms, others have severe symptoms, and some people have no symptoms at all. The most common symptom is chest pain, but the full picture is broader.
Symptom | What it may feel like |
Chest pain | Pressure, tightness, pain, squeezing, or aching |
Spreading pain or discomfort | To the shoulder, arm, back, neck, jaw, teeth, or upper belly |
Cold sweat | Sudden, unexplained sweating |
Fatigue | Unusual tiredness or exhaustion |
Heartburn or indigestion | A stomach-burning feeling that may seem unrelated to the heart |
Lightheadedness | Feeling faint or unsteady |
Loss of consciousness | Fainting or passing out |
Nausea | Upset stomach, sometimes mistaken for food poisoning |
Shortness of breath | Difficulty breathing, with or without chest pain |
Chest pain is usually the most common symptom. But for some people — women, older adults, and those with diabetes — symptoms may seem unrelated to a heart attack. For example, there may be nausea or a very brief pain in the neck or back.
Some heart attacks strike suddenly. But many people have warning signs and symptoms hours, days, or weeks in advance. Chest pain or pressure (angina) that keeps happening and doesn’t go away with rest may be an early warning sign. Angina is caused by a temporary decrease in blood flow to the heart.
When to Get Help: The 911 Steps
Having a heart attack is a medical emergency. If you think you’re having a heart attack, take these steps:
Step | What to do |
1. Call for emergency help | Immediately call 911 or your local emergency number. If emergency services are not available, have someone drive you to the nearest hospital. Drive yourself only if there are no other options. |
2. Take nitroglycerin, if prescribed | Take it as instructed by your care provider while awaiting emergency help. |
3. Take aspirin, if recommended | Aspirin may reduce heart damage by preventing blood clotting. But aspirin can interact with other drugs — don’t take it unless your care provider or emergency personnel say to. Don’t delay calling 911 to take aspirin. Call for emergency help first. |
Helping Someone Else
If someone is unconscious and you think they’re having a heart attack, first call 911 or your local emergency number. Then check if the person is breathing and has a pulse. If the person isn’t breathing or you don’t find a pulse, only then should you begin CPR (cardiopulmonary resuscitation — chest compressions that manually keep blood circulating):
If you’re untrained in CPR or don’t want to put your mouth on the person’s mouth or nose, do hands-only CPR: push hard and fast on the person’s chest — about 100 to 120 compressions a minute — until medical help arrives.
If you’re trained in CPR and confident, start with 30 chest compressions before giving two rescue breaths, and keep repeating that pattern until help arrives.
What Causes a Heart Attack?
Coronary artery disease causes most heart attacks. In this condition, one or more of the heart (coronary) arteries are blocked — usually by cholesterol-containing deposits called plaques. Plaques narrow the arteries, reducing blood flow to the heart. If a plaque breaks open, it can cause a blood clot in the heart.
Beyond plaque-related blockages, less common causes include:
Cause | What it is |
Coronary artery spasm | A severe squeezing of a blood vessel that’s not blocked; the artery generally has cholesterol plaques or early hardening from smoking or other risk factors (also called Prinzmetal’s, vasospastic, or variant angina) |
Certain infections | COVID-19 and other viral infections may cause damage to the heart muscle |
Spontaneous coronary artery dissection (SCAD) | A life-threatening tear inside a heart artery |
What Are the Risk Factors?
Risk factor | How it raises heart attack risk |
Age | Risk rises with age, starting at about age 45; it also tends to rise after menopause |
Tobacco use | Smoking and long-term secondhand smoke exposure — if you smoke, quit |
High blood pressure | Over time it damages arteries leading to the heart; combined with obesity, high cholesterol, or diabetes, risk increases even more |
High cholesterol, lipoprotein (a), and triglycerides | High LDL (“bad” cholesterol) narrows arteries; standard-range HDL (“good” cholesterol) may lower risk; lipoprotein (a) — a genetic LDL type unaffected by lifestyle — is linked to higher risk; high triglycerides also raise risk |
Obesity | Linked with high blood pressure, diabetes, high triglycerides, bad cholesterol, and low good cholesterol |
Diabetes | When the body doesn’t make the hormone insulin or can’t use it, blood sugar rises and heart attack risk increases |
Metabolic syndrome | Having at least three of — enlarged waist, high blood pressure, low good cholesterol, high triglycerides, high blood sugar — makes you twice as likely to develop heart disease |
Family history of early heart attacks | A brother, sister, parent, or grandparent with a heart attack by age 55 (males) or 65 (females) raises your risk |
Not enough exercise | A sedentary lifestyle is linked to higher risk; regular exercise improves heart health |
Unhealthy diet | High in sugars, animal fats, processed foods, trans fats, and salt |
Stress | Emotional stress, such as extreme anger, may increase risk |
Illegal drug use | Cocaine and amphetamines are stimulants that can trigger a coronary artery spasm |
A history of preeclampsia | High blood pressure during pregnancy increases lifetime heart disease risk |
An autoimmune condition | Rheumatoid arthritis or lupus can increase risk |
What Are the Possible Complications?
Heart attack complications are often due to heart muscle damage. Potential complications include:
Complication | What happens |
Arrhythmias | Irregular or atypical heart rhythms — damage affects how electrical signals move through the heart; some are serious and can be deadly |
Cardiogenic shock | A rare condition in which the heart is suddenly and abruptly unable to pump blood |
Heart failure | Extensive heart muscle damage makes the heart unable to pump blood; can be temporary or long-lasting (chronic) |
Pericarditis | Inflammation of the saclike tissue surrounding the heart, sometimes triggered by a faulty immune response; may be called Dressler syndrome, postmyocardial infarction syndrome, or postcardiac injury syndrome |
Cardiac arrest | Without warning, the heart stops; a heart attack increases the risk, and it can lead to sudden cardiac death without immediate treatment |
How Can You Prevent a Heart Attack?
It’s never too late to take steps to prevent a heart attack — even if you’ve already had one. Prevention centers on three areas:
Prevention step | What to do |
Follow a healthy lifestyle | Don’t smoke. Maintain a healthy weight with a heart-healthy diet. Get regular exercise and manage stress. |
Manage other health conditions | High blood pressure and diabetes can increase risk — ask your care provider how often you need checkups. |
Take medications as directed | Your provider may prescribe drugs to protect and improve your heart health. |
Learn CPR | Consider an accredited first-aid training course, including CPR and how to use an automated external defibrillator (AED). |
How Is a Heart Attack Diagnosed?
Ideally, a care provider screens you during regular checkups for risk factors that can lead to a heart attack. But a heart attack is often diagnosed in an emergency setting. If you’ve had or are having a heart attack, care providers take immediate steps to treat your condition. Diagnosis includes checking blood pressure, pulse, and temperature, plus tests to see how the heart is beating and to check overall heart health.
Test | What happens |
Electrocardiogram (ECG or EKG) | The first test — sticky patches (electrodes) on the chest and sometimes arms and legs record electrical signals as waves; can show if you are having or have had a heart attack |
Blood tests | Certain heart proteins (cardiac markers) slowly leak into the blood after heart damage |
Chest X-ray | Shows the condition and size of the heart and lungs |
Echocardiogram | Sound waves (ultrasound) create images of the moving heart; shows blood movement and can identify damaged areas |
Coronary catheterization (angiogram) | A thin tube (catheter) is inserted into an artery — usually in the leg — and guided to the heart; dye makes the arteries show clearly |
Cardiac CT or MRI | Imaging that shows the heart and chest and can show the severity of heart damage |
How Is a Heart Attack Treated?
Each minute after a heart attack, more heart tissue is damaged or dies. Urgent treatment is needed to fix blood flow and restore oxygen levels. Oxygen is given immediately, and specific treatment depends on whether there is a partial or complete blockage.
Medications
Medication | What it does |
Aspirin | Reduces blood clotting and helps blood keep moving through a narrowed artery; you may be told to chew aspirin after calling 911 |
Clot busters (thrombolytics/fibrinolytics) | Break up blood clots blocking blood flow — the earlier given, the less heart damage and the greater the chance of survival |
Other blood thinners (heparin) | Given by IV to make blood less sticky and less likely to form clots |
Nitroglycerin | Widens blood vessels and improves blood flow to the heart; treats sudden chest pain; given as a shot, under-the-tongue pill, swallowable pill, or skin patch |
Morphine | Relieves chest pain that doesn’t go away with nitroglycerin |
Beta blockers | Slow the heartbeat and decrease blood pressure; limit heart muscle damage and prevent future heart attacks; given to most heart attack patients |
ACE inhibitors | Lower blood pressure and reduce stress on the heart |
Statins | Lower unhealthy cholesterol; too much bad (LDL) cholesterol clogs arteries |
Surgical and Other Procedures
Procedure | What happens |
Coronary angioplasty and stenting (PCI) | A cardiologist guides a thin, flexible tube (catheter) to the narrowed part of the artery; a tiny balloon is inflated to widen the blocked artery; a small wire mesh tube (stent) may be placed to keep it open — some stents are coated with medication |
Coronary artery bypass grafting (CABG) | Open-heart surgery in which a surgeon takes a healthy blood vessel from another part of the body to create a new path for blood around the blocked or narrowed artery; may be done in an emergency or a few days later |
Cardiac Rehabilitation
Cardiac rehabilitation is a personalized exercise and education program that teaches ways to improve heart health after heart surgery. It focuses on exercise, a heart-healthy diet, stress management, and a gradual return to usual activities. Most hospitals offer cardiac rehabilitation starting in the hospital, and the program typically continues for a few weeks or months after you return home.
People who attend cardiac rehab after a heart attack generally live longer and are less likely to have another heart attack or complications. If cardiac rehab is not recommended during your hospital stay, ask your provider about it.
Self Care After a Heart Attack
Self-care step | What the source recommends |
Exercise | At least 30 minutes of moderate or vigorous activity five or more days a week; ask your provider about activity restrictions after a heart attack or surgery |
Eat a heart-healthy diet | Avoid or limit saturated fat, trans fats, salt, and sugar; choose whole grains, fruits, vegetables, and lean proteins such as fish and beans |
Maintain a healthy weight | Too much weight strains the heart and raises the risk of high cholesterol, high blood pressure, and diabetes |
Don’t smoke | Quitting smoking is the most important thing you can do; also avoid secondhand smoke |
Ask about alcohol | If you drink, limit to less than 1 to 2 drinks a day |
Get regular health checkups | Major risk factors — high cholesterol, high blood pressure, and diabetes — don’t cause early symptoms |
Manage blood pressure, cholesterol, and blood sugar | Ask your provider how often to have these checked |
Control stress | More exercise, mindfulness, and support groups can ease stress |
Get good sleep | Poor sleep may increase heart disease risk; adults should try for 7 to 9 hours daily |
Coping and Support
Having a heart attack is scary. Talking about your feelings with your care provider, a family member, or a friend might help — or consider a mental health care provider or a support group, where you can connect with others who have been through similar events. If you feel sad, scared, or depressed, tell your care provider. Cardiac rehabilitation programs can help prevent or treat depression after a heart attack.
Some people worry about having sex after a heart attack. Most people can safely return to sexual activity after recovery, but talk to your care provider first — timing may depend on your physical comfort, emotional readiness, and previous sexual activity. Some heart medications can affect sexual function, so mention any problems to your care provider.
Preparing for Your Appointment
A heart attack is usually diagnosed in an emergency setting. But if you’re concerned about your risk, a cardiovascular risk assessment can determine your risk level, and you may be referred to a cardiologist — a doctor trained in heart diseases.
When making the appointment, make a list of your symptoms (including any that seem unrelated to heart disease) and when they began; your family history of heart problems; important personal information such as recent major stresses; all medications, vitamins, and supplements with doses; and questions to ask. Bring a friend or relative along if possible.
Questions to ask your provider:
What tests do I need to determine my current heart health?
What foods should I eat or avoid?
What’s an appropriate level of physical activity?
How often should I be screened for heart disease?
I have other health conditions. How can I best manage these conditions together?
Are there brochures or other printed material that I can have? What websites do you recommend?
What your provider is likely to ask you:
How severe are your symptoms?
Are they constant or do they come and go?
What, if anything, seems to improve your symptoms?
If you have chest pain, does it improve with rest?
What, if anything, worsens your symptoms?
If you have chest pain, does strenuous activity make it worse?
Have you been diagnosed with high blood pressure, diabetes, or high cholesterol?
In the meantime, it’s never too early to make healthy lifestyle changes — quitting smoking, eating healthy foods, and becoming more active are important steps in preventing heart attacks.
Conclusion
A heart attack is a life-threatening interruption of blood flow to the heart, most often caused by cholesterol plaques that rupture and clot. Its most common symptom — chest pain or pressure — can mimic heartburn, and in women, older adults, and people with diabetes, the warning signs may look like nothing more than nausea or a brief ache in the neck or back. The difference between a full recovery and lasting heart damage comes down to minutes: calling 911 right away, taking prescribed nitroglycerin while you wait, and letting emergency care restore blood flow with medicines and procedures.
If you’re over 45 or have any of the 14 risk factors on this page, don’t wait for a warning sign—ask your care provider about a cardiovascular risk assessment and which screening tests fit your situation. If chest pain, unexplained shortness of breath, or cold sweat strikes, call 911 first. Every minute counts.
FAQ
What does a heart attack feel like?
The most common symptom is chest pain that feels like pressure, tightness, squeezing, or aching. The pain or discomfort can spread to the shoulder, arm, back, neck, jaw, teeth, or upper belly, and may be accompanied by cold sweat, fatigue, heartburn, lightheadedness, nausea, shortness of breath, or loss of consciousness.
Can you have a heart attack without chest pain?
Yes. Some people have mild symptoms, others have severe symptoms, and some have no symptoms at all. Women, older adults, and people with diabetes may experience symptoms that seem unrelated to the heart, such as nausea or a very brief pain in the neck or back.
What should you do if you think you’re having a heart attack?
Immediately call 911 or your local emergency number. Take nitroglycerin if it has been prescribed to you, and take aspirin only if your care provider or emergency personnel recommend it. Do not drive yourself to the hospital unless there are no other options, and do not delay calling 911 to take aspirin.
What is the difference between a heart attack and cardiac arrest?
A heart attack is a circulation problem — blocked blood flow damages the heart muscle. Cardiac arrest is an electrical problem — the heart suddenly stops beating without warning. A heart attack increases the risk of cardiac arrest, which can lead to sudden cardiac death without immediate treatment.
What is STEMI and how is it different from NSTEMI?
These are two types of heart attack classified by ECG results. A STEMI usually means an acute complete blockage of a medium or large heart artery and requires emergency invasive treatment. An NSTEMI usually means a partial blockage, though some people with NSTEMI have a total blockage.
How is a heart attack treated in the hospital?
Oxygen is given immediately. Treatment may include aspirin, clot busters (thrombolytics), heparin, nitroglycerin, morphine, beta blockers, ACE inhibitors, and statins, plus a procedure to open the blocked artery — coronary angioplasty with stenting or coronary artery bypass grafting (CABG).
Can you survive a heart attack without treatment?
A heart attack can be fatal without prompt treatment, and each minute without treatment damages or destroys more heart muscle. Surviving without treatment is possible but raises the risk of severe complications such as heart failure, arrhythmias, cardiogenic shock, and cardiac arrest.
What is cardiac rehabilitation, and why does it matter?
Cardiac rehabilitation is a personalized exercise and education program that starts in the hospital and continues for weeks or months at home. People who attend cardiac rehab after a heart attack generally live longer and are less likely to have another heart attack or complications.
Related Reading
References
Heart attack — Symptoms & causes — clinical information dated March 27, 2026
Heart attack — Diagnosis & treatment — clinical information dated March 27, 2026
This article is for general educational purposes only and is not a substitute for professional medical advice. If you think you’re having a heart attack, call 911 or your local emergency number immediately.
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