Itching on the scalp, especially behind the ears or at the nape of the neck
A tickling or crawling feeling in the hair
Small red bumps or sores on the scalp, neck, or shoulders
Trouble sleeping due to scalp itching
Finding tiny white or yellowish oval eggs attached to hair shafts near the scalp
Seeing live lice, which are small tan, grayish, or brown insects moving in the hair
Noticing nits that do not slide off the hair easily when you try to remove them
Checking with a bright light and fine-tooth comb, especially around the ears and neckline
Having close contact with someone who has lice
Head scratching that continues even after washing hair