60% of patients have recurrent varicose veins in the five years following their surgery.  Several possible causes have been recognized for recurrent varicose veins. Here are the three main ones:
1. Inadequate surgery
Blood reflux can still persist after the surgery. For that reason, it is strongly recommended that your physician do a post-operative duplex scanning of your legs to see if your other veins are functioning well.
Even when no error or technical inadequacy happened during the treatment, it is still possible to have a similar varicose vein a few years later. New venous vessels may develop around the treated varicose vein and connect the deep veins to the superficial veins, causing other varicose veins.
3. Progression of the disease
Varicose veins removal is not a cure for venous insufficiency. Because the disease is still present, new territories may be affected over time. This is especially true if additional care, such as wearing compression stocking and taking the necessary nutrients, is neglected.