To diagnose varicose veins, your doctor will do a physical exam, including looking at your legs while you're standing to check for swelling. Your doctor may also ask you to describe any pain and aching in your legs.
You also may need an ultrasound test to see if the valves in your veins are functioning normally or if there's any evidence of a blood clot. In this noninvasive test, a technician runs a small hand-held device (transducer), about the size of a bar of soap, against your skin over the area of your body being examined. The transducer transmits images of the veins in your legs to a monitor, so a technician and your doctor can see them.