Positional change.: The veins in the face just as the veins in the rest of the body change in size depending on changes in position as well as changes in levels of hydration and changes in pressure in the chest and abdominal cavity. In the face, the veins decrease with standing and increase with lying down. Straining or laughing increase the the pressure in the chest which can increase the size of the facial veins.
Answered 12/10/2013
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Vessel Dilate: All vessels dilate when you exercise. The ones on your head are probably closer to the skin and are more visible.
Answered 9/11/2013
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