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Acute Coronary Syndrome

Published: August 5, 2026Updated: August 20, 2026

Acute Coronary Syndrome (ACS) is a serious condition that occurs when there is a sudden reduction in blood flow to the heart, often caused by a tear in the coronary artery or a blood clot.

Quick summary

ACS is a medical emergency requiring immediate hospitalization. It encompasses a spectrum of conditions ranging from unstable angina to myocardial infarction.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 20, 2026Editorial policy

Key facts at a glance

ICD-10
I24.9
ICD-11
BA00.0
Body system
cardiovascular
Severity
moderate
Chronic
false

Signs and symptoms

Common signs and symptoms that may indicate this condition.

Warning signs - seek immediate care

!

Chest pain

!

Shortness of breath

Chest discomfort or palpitations

(cardiovascular)

Noticeable symptoms that may vary in intensity over time.

Frequency: Varies

Nausea

(cardiovascular)

Diaphoresis

(cardiovascular)

Medication Comparisons

Compare medications used to treat Acute Coronary Syndrome. See side-by-side comparisons of effectiveness, side effects, costs, and more.

View Medication Comparisons

Frequently asked questions

What are the common symptoms of Acute Coronary Syndrome?
What should I do if I suspect someone is having a heart attack?
What is the difference between STEMI and NSTEMI?
Can Acute Coronary Syndrome be prevented?
What is the typical treatment for Acute Coronary Syndrome?
  1. 1
    Mayo ClinicSource
  2. 2
    American Heart AssociationSource
  3. 3
    National Heart, Lung, and Blood Institute (NHLBI)Source

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy