Chronic venous insufficiency is an inability of the veins to return blood to the heart due to a lack of energy. Most often, venous insufficiency occurs in the legs because these veins must force against gravity to return the blood to the heart. The main symptom of venous insufficiency is the appearance of varicose veins, but before that, tingling, a feeling of heaviness or congestion in the legs can be felt. Discover our food supplements to relieve you.