What does blood vessel overlap mean? Our veins are kilometres-long structures that occupy many kilometres of space in our body. They are involved in the transport of blood and are fixed in the places they travel in our body. It is out of the question for one of our veins to move from one place to another, to go and joke with someone else, to go above it, to go under it. Therefore, there is no such thing. Overlapping of veins is a condition that is more commonly used to describe muscle pains.