I woke up today and the vein on the top of my foot is bulging and in a lot of pain. i tried wearing a compression sock to see if that helped and it did but made my toes numb. what could be causing this?

More info needed: The fact that you have compression stockings tells me you may have had vein problems before, it is unusual to have a vein buldging while lying down. Do you have any varicose veins? Do you have any family history of deep vein blood clots? You doctor should compare your current exam with their records of prior exams. Hope you are better.

Needs evaluation.: A tender bulging vein suggests an inflammation of the vein which is called superficial thrombophlebitis. This can be to localized trauma or to even a poorly fitting shoe. Whether or not the pain is the cause of your discomfort, you should be evaluated by a vein specialist. The numbness in the foot could be due to the stocking being too tight.

Get it checked: Your history of compression socks indicates you have had problems with swelling in the past. This current problem may be an engorged vessel. It needs to be examined. If the swelling is great, it will also compress superficial nerves in the area which result in numbness.