Chronic venous insufficiency (CVI) is a condition characterized by difficulty in sending blood back to the heart by the veins due to faulty one-way valves. Pronounced veins, i.e., the veins that grow in size and may take on a twisted or branch-like appearance, is the most common symptom. These are varicose veins and result from blood pooling in the veins causing pressure to build up in the vein walls. In addition, venous insufficiency can cause the legs to become painful, heavy, and tired. ... [Read More]