Head lice are small insects that live on the head because the blood runs closer to the surface than anywhere else in the body, which is why head lice only live on the head. When a person has head lice, what makes them itchy is not the eggs. What makes your head itchy is the bites left behind when the bug feeds off your head. Head lice spread mostly from head to head contact. Head Lice DO NOT fly or jump. Many people still believe this to be true, but lice only crawl. One last important fact, people do not get head lice because they are dirty, head lice actually prefer a clean head because it is easier for the bug to move around and for them to attach their eggs to your hair shaft.