Recent Blog Articles

Head Lice

October 30, 2020

What are they?

Head lice are small, parasitic insects that infest hair on the head of people. Their six legs allow them to grasp and wander between hairs. They feed only on the blood of people, and feed once or more each day. They are more common on children than adults.

In general, a person infested with head lice will have fewer than a dozen live lice on his or her head at a time, although hundreds of developing, dead and hatched eggs may be present. A single insect is called a louse. A female louse can lay more than 100 eggs, called nits, in her lifetime. The female louse secretes a glue to attach each egg to a scalp hair, usually close to scalp level. They hatch about 8 days after they are laid, and grow to the adult stage about 9 to 12 days after hatching. Adult head lice survive just a few weeks on the scalp, but die within a day once removed from a person.

To continue reading this article, you must log in.

Subscribe to Harvard Health Online for immediate access to health news and information from Harvard Medical School.

  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »

I'd like to receive access to Harvard Health Online for only $4.99 a month.

Sign Me Up

Already a member? Login ».

Disclaimer:

As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update on all articles. No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.

Harvard Health Publishing Logo

Thanks for visiting. Don't miss your FREE gift.

The Best Diets for Cognitive Fitness, is yours absolutely FREE when you sign up to receive Health Alerts from Harvard Medical School

Sign up to get tips for living a healthy lifestyle, with ways to fight inflammation and improve cognitive health, plus the latest advances in preventative medicine, diet and exercise, pain relief, blood pressure and cholesterol management, and more.

Harvard Health Publishing Logo

Health Alerts from Harvard Medical School

Get helpful tips and guidance for everything from fighting inflammation to finding the best diets for weight loss...from exercises to build a stronger core to advice on treating cataracts. PLUS, the latest news on medical advances and breakthroughs from Harvard Medical School experts.

BONUS! Sign up now and
get a FREE copy of the
Best Diets for Cognitive Fitness

Harvard Health Publishing Logo

Stay on top of latest health news from Harvard Medical School.

Plus, get a FREE copy of the Best Diets for Cognitive Fitness.