While it's true that lice cause people to be itchy, it's also the case that not feeling itchy does not mean that you don't have lice. As the article states, many people will scratch after having thousands of lice bite their head but some will scratch after just a day. Many parents will tell me that their child complained of having an itchy scalp but they assumed it was nothing. They have bought dandruff shampoo, blamed the itchiness on the weather being too hot, and too cold. I think that many people have some much fear about head lice and they find any other reason to explain itchiness other than the possibility of it being head lice.