Why is endovenous ablation done?

When a vein treatment has a long name, the first thing most people ask is why anyone needs it. Here is the answer as the source puts it.
Why it is done
my.clevelandclinic.org says you might need endovenous thermal ablation if you have medium to large varicose veins in your legs.
Reading around the answer
If the term varicose veins is new to you, the MedlinePlus page on varicose veins and spider veins is a friendly place to see the basics. The Society of Interventional Radiology page on superficial venous disease and chronic venous insufficiency goes into the wider topic.
A simple next step
Make a short note of which leg and which veins concern you. That note makes a good starting point for a visit.