How Contagious Are Head Lice?

Did you just receive a notice from your child's school about head lice? Head lice are contagious and they commonly spread among kids who have close contact with each other. You should definitely check your child if you are notified they are present in children at your school or daycare.

Don't panic because you have heard that head lice is going around, or even if you find lice on your child. Head lice infestations are a common problem in children, even in those who practice good hygiene and frequent hair washing. Lice only infect humans and they are spread by direct contact with someone who is already infected or by use of their belongings (such as hats, brushes or combs).

A parent combing child’s hair for head lice
Peter Dazeley / Getty Images

Are Lice Contagious?

While head lice are contagious, just not in the same way as measles or the flu. In fact, it is thought that lice have a 'low contagion' risk in classrooms.

Unlike many other childhood infections, they are only contagious if you have direct contact with someone else that has head lice. And that typically means direct head-to-head contact.

The Truth About Head Lice

  • Lice don't jump
  • Lice don't hop
  • Lice don't fly
  • Lice CAN crawl

Indirect contact with someone who has head lice is another way to get lice, although it is thought to be much less common. That might occur when the head lice crawl onto a hat, helmet, hair ribbon, brush, or comb, etc., and then your child uses that contaminated item.

In addition to school, many experts think that kids are even more likely to get lice outside of school, especially at slumber parties and sleepovers.

Screening Kids for Lice

Does your child have any symptoms of head lice? The most common symptom of children infected with head lice is itching, you should definitely check your child if she has been recently itching her head or neck. However, some children do not complain of itching if they have a light infestation.

Even if your child has no complaints or symptoms, if there is a head lice outbreak at school, then you should just begin checking your child regularly for live lice. What should you look for?

  • Adult lice are reddish-brown and 1/16 of an inch long. They move very fast and are most commonly seen at the back of the neck and behind the ears.
  • Nits are eggs from the adult lice and are whitish and are firmly attached to hairs.
  • Reviewing some head lice pictures can make it helpful so you know what to look for.
  • If you just see nits, then you should try to remove them all and continue to check your child regularly, even daily, for live lice.
  • Do you really see new nits? It is easy to confuse nits with dandruff, hair casts, or even old, empty lice eggs.

Treatment with an anti-lice shampoo will be necessary if you see live lice or if you continue to see new nits, which is a sign of a live head lice infestation.

What to Know About Lice

Other things to know about lice include that:

  • Lice can only survive for two to three days when off of the human body.
  • The eggs hatch in 6-10 days and it then takes another two to three weeks for the lice to mature and be able to reproduce (lice life cycle).
  • Over-the-counter Rid or Nix are still recommended as the primary treatments for kids with active head lice infestations.
  • Prescription lice treatments or 3-week cycles of manually removing lice/nits can be considered if resistant lice are suspected.

Most importantly, understand that kids don't have to be sent home from school just because they have nits or even live lice. Their parents should simply be notified so that they can be treated after school.

Head Lice Doctor Discussion Guide

Get our printable guide for your next doctor's appointment to help you ask the right questions.

Doctor Discussion Guide Child
5 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Head Lice: Frequently Asked Questions. Centers for Disease Control and Prevention. September 2019.

  2. Michigan Head Lice Manual. Michigan Department of Education. August 2013.

  3. Head Lice: What Parents Need to Know. American Academy of Pediatrics. March 2017.

  4. Treating and Preventing Head Lice. US Food & Drug Administration. January 2020.

  5. Head Lice Information for Schools. Centers for Disease Control and Prevention. September 2015.

Additional Reading
  • American Academy of Pediatrics Clinical Report. Head Lice. Pediatrics. Volume 135, number 5, May 2015

By Vincent Iannelli, MD
 Vincent Iannelli, MD, is a board-certified pediatrician and fellow of the American Academy of Pediatrics. Dr. Iannelli has cared for children for more than 20 years.