A “vein doctor” (venous specialist) is a physician trained in diagnosing and treating disorders of the veins—particularly varicose veins, spider veins, chronic venous insufficiency, deep vein thrombosis, and venous ulcers. USA Vein Clinics is a network of outpatient centers across the U.S. that offers minimally invasive treatments like endovenous laser therapy, radiofrequency ablation, sclerotherapy, ClariVein®, and VenaSeal™.