They are never a serious health problem. They cause an itchy scalp, sometimes some swollen glands in the neck, and if you have them for a long time, you may feel very tired or run-down. They are contagious. If you routinely share hats, scarves, hair ornaments, unwashed clothes or towels with your friends, you can pick up lice. If you sleep in beds or sleeping bags of people with lice , you will most likely pick them up.
Sexual intimates can readily pass the lice to each other, as can children.
You can protect yourself by limiting your exposure. Lice are treated by the use of Nix , an over the counter cream rinse which contains permethrins, a natural insecticide. The Student Health Center has Nix available over the counter. Or if you prefer, you can be seen by one of the medical practitioners. In the meantime, limit your exposure to lice by not sharing clothes, hats, hairbrushes or bedding.