Vein ablation is a minimally invasive technique that uses laser energy to cauterize, or close, varicose veins in order to alleviate symptoms, such as cramping and swelling. It can also help reduce your risk of deep vein thrombosis (DVT).
https://www.usaveinclinics.com/blog/is-vein-ablation-painful-a-closer-look-at-this-treatment-for-varicose-veins/