Varicose veins are swollen, enlarged veins. They happen most often in the legs. Varicose veins can develop when valves in your veins become damaged. This causes problems with blood flow. Over time, too much blood collects in your veins. The veins may bulge, twist, and stand out under your skin. They can also cause symptoms such as aching, cramping, or swelling in your legs.
Radiofrequency ablation (RFA) is a procedure to treat varicose veins using heat created from radiofrequency (RF). During RFA treatment, RF heat is sent into your vein through a thin, flexible tube (catheter). This closes off blood flow in the main problem vein.