Is it bad that my veins sometimes show on the side of my forehead.?

No: Visible veins on the side of the head is not bad. When blood does not drain from the head as fast as it is arriving, veins can become engorged and appear enlarged. As long as they are not painful, tender or bleeding there is little to worry about.

No: There is no harm in veins on your side of your forehead. Occasionally people are bothered by the appearance. If so it can be treated with injections.

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.