Head lice are small parasitic insects which mainly live on the scalp and neck hairs of humans. Lack of hygiene or sanitation is not a cause of head lice. Head lice are contagious and are passed from an infected person to uninfected person by direct head-to-head contact, shared combs and hairbrushes, hats and other hair and head accessories. They can also be found on bedding or upholstered furniture for a