Medications
Aspirin Before Surgery
Whether to stop aspirin depends on the dose and why you take it — and stopping it can be risky for some patients. Here's the clear version.
Quick answer
Why it matters
Aspirin makes platelets less sticky, which lowers clotting and can increase bleeding during surgery. That's why higher doses are sometimes paused.
But for people with heart disease, a coronary stent, or a past stroke, stopping aspirin can let a dangerous clot form. For them, the small extra bleeding risk is usually safer than stopping. The right answer balances both — which is why it's individualized.
Do not stop without instruction
What to ask your doctor
- What dose am I on, and is it for my heart/stroke or general prevention?
- For this surgery, should I continue or hold my aspirin?
- If I hold it, exactly which day do I stop and when do I restart?
- Do I have a stent or heart condition that makes stopping risky?
Red flags — call your team
Red flags — call your team
- You have a coronary stent and were told to stop aspirin — confirm first
- Chest pain, shortness of breath, or stroke symptoms
- Unusual or heavy bleeding before surgery
References
- American Society of Regional Anesthesia and Pain Medicine (ASRA) — anticoagulation in regional/neuraxial anesthesia. asra.com
- American College of Cardiology / American Heart Association (ACC/AHA) — perioperative cardiovascular guidelines. acc.org
- American Society of Anesthesiologists (ASA). asahq.org
Frequently asked questions
Do I need to stop low-dose aspirin before surgery?
Often no. Low-dose aspirin (around 75 mg) for heart or stroke protection is frequently continued through surgery. Confirm with your team, especially if you have a stent.
How many days before surgery should I stop aspirin?
If your team advises stopping a higher dose, it is usually about 7 days before. Do not stop on your own if you take it for your heart.