Spontaneous coronary artery dissection (SCAD)

Date Updated: 04/17/2026

Overview

Spontaneous coronary artery dissection is an emergency condition. It happens when a tear forms in a wall of a heart artery. The condition also is called SCAD.

SCAD can slow or block blood flow to the heart. This can lead to a heart attack, irregular heartbeats or sudden death.

SCAD most commonly affects women in their 40s and 50s. But it can happen at any age and can occur in men. People who have SCAD often don't have risk factors for heart disease, such as high blood pressure, high cholesterol or diabetes.

SCAD can cause sudden death if it isn't treated right away. Get emergency medical help if you have heart attack symptoms — even if you think you aren't at risk of a heart attack.

Symptoms

Symptoms of spontaneous coronary artery dissection, also called SCAD, can include:

Chest pain or pressure.
Pain in the arms, shoulders, back or jaw.
Shortness of breath.
Unusual sweating.
Extreme tiredness.
Upset stomach.
A rapid heartbeat or fluttery feeling in the chest.
Feeling dizzy.

When to see a doctor

Call 911 or your local emergency number if you have chest pain or think you might be having a heart attack. If you don't have access to emergency medical services, have someone drive you to the nearest hospital. Do not drive yourself unless you have no other choice.

Causes

The cause of spontaneous coronary artery dissection is not known.

Risk factors

Risk factors for spontaneous coronary artery dissection, also called SCAD, include:

Being assigned female at birth. SCAD can happen to anyone. But it tends to affect women more than men.
Childbirth. Some women with SCAD have recently given birth. Changes in hormones and stress on the blood vessels from pregnancy may play a role in SCAD. Usually, the condition seems to happen in the first few weeks after delivery. But SCAD also can occur during pregnancy.
Extreme stress. SCAD can happen after extreme stress. This includes intense exercise and severe emotional distress.
Fibromuscular dysplasia, also called FMD. This condition weakens the body's medium-sized arteries. FMD may lead to an aneurysm or rupture of an artery, called a dissection. Women are more likely to have FMD than are men.
Genetic conditions affecting connective tissue. Ehlers-Danlos and Marfan syndromes have been found to occur in people who have had SCAD.
Very high blood pressure. Severe high blood pressure can raise the risk of SCAD.
Illicit drug use. Using cocaine or other illicit drugs might increase the risk of SCAD.

Complications

A possible complication of spontaneous coronary artery dissection, also called SCAD, is a heart attack. SCAD slows or stops blood flow through an artery. This weakens the heart and may lead to a heart attack. A heart attack from SCAD is different from a heart attack caused by clogged arteries, also called atherosclerosis.

In some people with SCAD, the inner and outer layers of the artery may split. Blood can collect between these layers. Pressure from the collection of blood can make SCAD worse.

Even with successful treatment, SCAD can happen more than once. It might happen soon after the first time or years later. People who have SCAD also may have a higher risk of other heart conditions, such as heart failure due to heart attack damage.

Diagnosis

Spontaneous coronary artery dissection, also called SCAD, is usually diagnosed in an emergency setting. You may be asked questions about your personal and family medical history. Tests are done to check your heart.

Tests

Tests to diagnose SCAD are similar to tests used to detect a heart attack. They may include:

Blood tests. Some heart proteins slowly leak into the blood after heart damage from a heart attack. Blood tests can check for these proteins. Other blood tests also may be done.
Electrocardiogram, also called an ECG or EKG. This quick test checks the heart's electrical activity. It can show how fast or how slow the heart is beating. Sticky patches with sensors on them attach to the chest and sometimes the arms and legs. Wires connect the patches to a computer, which prints or displays results. An electrocardiogram can tell if you are having or have had a heart attack.
Coronary angiogram. This test uses a thin, flexible tube called a catheter to look inside the heart arteries. A doctor places the tube into a blood vessel, usually in the groin or wrist. It's guided to the heart. Dye flows through the tube. The dye helps the arteries show up more clearly on X-ray images and video. A coronary angiogram can diagnose SCAD.

Other tests may be done during a coronary angiogram to confirm SCAD and plan treatment. These tests include:

Optical coherence tomography. This test uses light to see inside the blood vessels and blood vessel walls. The doctor inserts a flexible tube called a catheter into a blood vessel and guides it to the heart. A beam of light shines from the catheter. The test can help accurately diagnose the cause of a heart attack.
Intravascular ultrasound. Sound waves make pictures of the inside of the heart arteries. The doctor inserts a flexible tube called a catheter into a blood vessel and guides it to the heart. A device on the end of the tube gives off sound waves. A computer looks at the sound waves that bounce back and turns them into pictures of the heart arteries.

Treatment

The goals of treating spontaneous coronary artery dissection, also called SCAD, are to:

Fix blood flow to the heart.
Manage chest pain.
Prevent SCAD from happening again.

Treatment may include medicines and a procedure or surgery to open the artery and restore blood flow. Sometimes SCAD heals on its own.

The type of treatment for SCAD depends on your overall health and the size and location of the tear in the artery.

Medications

Some people with SCAD only need medicines to treat symptoms. If chest pain or other symptoms continue, other treatments might be needed.

Medicines to treat SCAD may include:

Aspirin. Taking aspirin long-term may help to lower the risk of heart disease after SCAD. Talk with a healthcare professional to decide if daily aspirin therapy is right for you.
Blood pressure medicines. Several medicines are available to lower blood pressure. You might need to take these medicines for life to reduce the risk of another SCAD.
Medicines to control chest pain. Medicines called nitrates and calcium channel blockers can help treat chest pain after SCAD.

Surgery or other procedures

Some people with SCAD need surgery or other treatment to fix the artery and improve blood flow to the heart. These treatments may include:

Coronary angioplasty (AN-jee-o-plas-tee) and stent. This treatment may be needed if SCAD blocks blood flow to the heart or medicines don't control chest pain.

A doctor places a long, thin flexible tube called a catheter in a blood vessel, usually in the groin or wrist. It's guided to the heart. A small balloon on the tip of the catheter widens to open the artery. Then, the doctor places a tiny mesh tube called a stent inside the artery. The stent holds the artery open and improves blood flow. The balloon is removed. The stent stays in place. Another name for this treatment is percutaneous coronary intervention or PCI.
Coronary artery bypass surgery. This open-heart surgery creates a new path for blood to flow around a blocked or partially blocked artery. It may be done if other SCAD treatments don't work or if you have more than one tear. The surgeon takes a healthy blood vessel from the chest or leg area. This healthy vessel is called a graft. One end of the graft is stitched to the artery below the blockage. The other end is stitched to the heart. Other names for this surgery are heart bypass surgery, coronary artery bypass grafting and CABG — pronounced "cabbage."

Pregnancy

If you've had spontaneous coronary artery dissection, also called SCAD, talk with a healthcare professional before becoming pregnant. Pregnancy may not be safe after SCAD.

Cardiac rehabilitation

After treatment for SCAD, you need regular checkups with your healthcare team.

A personalized program of exercise and education may be suggested. This is called cardiac rehabilitation, also known as cardiac rehab. It helps you recover from a serious heart condition. The program often includes supervised exercise, emotional support and education about a heart-healthy diet.

Lifestyle and home remedies

It's important to take steps to keep the heart healthy. Try these tips:

Don't smoke or use tobacco. Smoking is a major risk factor for heart disease. Not smoking is the best way to reduce your risk. Also stay away from secondhand smoke. If you need help quitting, ask your healthcare team for strategies that can help.
Eat healthy foods. Choose whole grains, fruits, vegetables, and lean proteins, such as fish and beans. Avoid or limit foods with a lot of saturated fat, trans fats, salt and sugar.
Exercise. Regular exercise helps manage diabetes, high cholesterol and high blood pressure — all risk factors for heart disease. With your healthcare team's OK, try to get 30 to 60 minutes of physical activity most days of the week. Talk with your healthcare team about the amount and type of exercise that's best for you. If you've had SCAD, you may be told to avoid intense lifting, competition and extreme temperatures.
Keep a healthy weight. Too much weight strains the heart. Being overweight increases the risk of high cholesterol, high blood pressure and diabetes. Ask your healthcare professional what weight is best for you.
Limit alcohol. If you choose to drink alcohol, do so in moderation. For healthy adults, that means up to one drink a day for women and up to two drinks a day for men.
Manage blood pressure, cholesterol and blood sugar. Ask your healthcare team how often you need to have your levels checked.
Practice good sleep habits. Poor sleep may increase the risk of heart disease and other health conditions. Adults should try to get 7 to 9 hours of sleep daily. Go to bed and wake at the same time every day, including on weekends. If you have trouble sleeping, talk with a healthcare professional about treatments that might help.
Manage stress. Find ways to help reduce emotional stress. Some ideas are to get more exercise, practice mindfulness and connect with others in support groups.

Coping and support

Understanding SCAD and your health and talking with others may be helpful. Try these tips:

Learn about SCAD. Knowing the details may make you feel more comfortable when talking with your care team. Ask about the size of your artery tear and where it is. Understand the treatments you'll receive and why you need them. Ask where you can find more information.
Join a support group. It may be helpful to connect with others who know what you're going through. Ask your healthcare team if there are any SCAD or heart disease support groups in your area.

Preparing for an appointment

You may not have time to prepare. SCAD usually is diagnosed in an emergency setting. If you have chest pain or think that you're having a heart attack, immediately call 911 or your local emergency number.

After a SCAD diagnosis, you may have questions about your health. Make a list of questions to ask your healthcare professional, such as:

What caused my SCAD?
What tests do I need?
What's the most appropriate treatment?
Will the tear in my artery heal on its own?
What is my risk of having another SCAD?
Do I have a blood vessel condition, such as fibromuscular dysplasia, also called FMD?
I have other health conditions. How can I best manage them together?
How should I change my diet or activities?
Is it safe for me to get pregnant?
Is there any information that I can take home with me? What websites do you recommend?

Don't hesitate to ask other questions.