Thyroid fine needle aspiration biopsy is a very safe procedure, but it does carry some slight risks. These include:
- Bleeding at the biopsy site;
- Damage to the structures near the thyroid.
Because most healthcare providers use ultrasound to guide the procedure, this last complication is rare. There is also a small risk that the fine needle aspiration biopsy will not show for sure whether the nodule is cancerous.