Varicose veins are blue bulging veins that typically appear in the thighs and calves, normally developing after childbirth or with age. Common symptoms are aching, pain, burning, itching, and swelling caused by poorly functioning vein valves. The blood leaks back, enlarging the vein. Spider veins are caused by similar conditions, but appear smaller and closer to the skin surface. They are typically red, blue, or purple. There are many non-invasive treatment options.