Varicose veins are a symptom of weakened veins and valves in the legs. There are one-way valves that keep blood flowing upward from the legs toward the heart. When these valves don’t function properly, blood collects in the legs and pressure is built up. As a result, the veins become large, twisted and weak. Laser ablation treatment is done for this condition and it is a nonsurgical procedure. Other treatments include radiofrequency ablation, sclerotherapy, ablation by glue or MOCA.