Why Does Swelling Occur After a Blood Draw?
- Blood Leaking Under the Skin – If the needle punctures the vein and some blood escapes into the surrounding tissue, it can cause swelling.
- Not Enough Pressure Applied Post-Draw – Failing to apply firm pressure to the puncture site immediately after the blood draw can lead to bruising and swelling.
- Small or Fragile Veins – Some individuals naturally have more delicate veins, making them prone to this issue.
- Excessive Arm Movement – Bending or using the arm too soon after the draw can cause blood to pool under the skin.
How to Reduce and Prevent Swelling
✔ Apply Pressure Immediately – Hold firm pressure on the site for at least 2–5 minutes after the blood draw.
✔ Keep Your Arm Still – Avoid heavy lifting or bending your arm excessively for a few hours.
✔ Use Ice Packs – Applying a cold compress can help minimize swelling and discomfort.
✔ Stay Hydrated – Drinking enough water helps with circulation and healing.