Main Content
Top of the page
Head lice are tiny insects that live close to the scalp, where they lay and attach their eggs (nits). Lice can't survive unless they are close to the scalp.
Head lice are most common in children. They can spread anytime a child's head comes into contact with the head or hair of someone who has lice. Lice can't fly or jump.
Head lice aren't dangerous. They don't spread disease or have anything to do with how clean someone is.
Head lice may cause an itchy feeling on the scalp. This is because of your body's reaction to the lice bites. But not everyone has itching, and not all itching means you have lice. Lice can be on the scalp for 4 to 6 weeks before itching starts.
You can check for head lice at home. Use a fine-toothed comb. Part small sections of hair in a place with good light. Using a magnifying glass can help. You can also check with a doctor, who will ask about symptoms and check the scalp and hair for lice and nits.
There are several over-the-counter medicines that kill lice. Most of them are creams or shampoos that you put on the scalp. Each type of medicine is a little different, so it's important to follow the directions carefully. Your doctor or pharmacist can answer any questions you may have.
Current as of: November 16, 2023
Author: Healthwise StaffClinical Review BoardAll Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
Author: Healthwise Staff
Clinical Review BoardAll Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.