What do lice to humans hair?

Lice are attracted to human hair because it is a warm and humid environment that provides them with a source of food. They use their sharp claws to attach to the hair shaft, and then use their mouthparts to pierce the skin and feed on blood. Lice can cause a variety of symptoms in humans, including itching, scalp pain, and red, irritated skin. In some cases, they can also lead to secondary infections.