Why no aspirin before surgery?

Short answer: aspirin is often stopped before surgery because it makes bleeding more likely during and after the operation.

Why this happens:
- Aspirin permanently blocks a platelets’ ability to clump together (it inhibits COX-1 and thromboxane A2).
- Platelets only reset their function when new ones are made, which takes about 7–10 days. During that time, bleeding can be heavier and harder to control if you’re cut or operated on.

Typical timing:
- For elective (planned) surgeries, many doctors suggest stopping low-dose aspirin about 7–10 days beforehand so normal clotting can return.
- There are exceptions. If you have a recent coronary stent, heart disease, or are on aspirin for secondary prevention, your cardiologist or surgeon may advise continuing aspirin or using a different plan (e.g., bridging or adjusting timing). The decision depends on your individual risk of heart attack/stent thrombosis vs. bleeding risk.

What to do:
- Always follow your surgical team’s specific instructions. They know your medical history and the procedure.
- If you’re unsure or if you’re on aspirin for heart protection, talk to both the surgeon and cardiologist before stopping any medication.
- If you accidentally take aspirin the day of surgery, tell the anesthesia team—they may adjust precautions or reschedule.

If you want, tell me about your planned procedure and whether you’re taking aspirin for heart disease or prevention, and I can give more tailored information. This isn’t a substitute for medical advice—confirm with your healthcare providers.