Head Lice: Causes, Symptoms, and Treatment
Medically reviewed by Sumiran Racherla, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Head Lice?
Head lice are usually handled by a primary care doctor or a pediatrician, a doctor who treats children. A pharmacist can also help you pick a treatment. Ask a doctor first if the person is pregnant, nursing, or a young child. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is head lice?
Head lice are tiny insects that live on people's heads. Adults are about the size of a sesame seed. Their eggs are called nits. Nits are even smaller, about the size of a dandruff flake. Lice and nits are found on or near the scalp, most often at the neckline and behind the ears.
Head lice are parasites. They feed on human blood to survive. Head lice do not spread disease and are not considered a health hazard.
Symptoms
Some people have no symptoms, especially with a first or light infestation. Common symptoms include:
- Itching, the most common symptom. It is an allergic reaction to the bites.
- A tickling feeling, or a sense of something moving in the hair.
- Trouble sleeping, because lice are most active in the dark.
- Sores from scratching, which can become infected with bacteria.
The first time someone has head lice, itching may take four to six weeks to start.
Causes and who gets it
Head lice mostly spread by head-to-head contact with a person who has them. Lice crawl. They cannot hop or fly. Less often, they spread through shared hats, scarves, combs, brushes, or towels. They can also spread through a bed, couch, or stuffed animal that an infested person used recently.
Getting head lice has nothing to do with being clean. Animals do not get or spread head lice. Lice are unlikely to spread in a swimming pool.
Children ages 3 to 11 and their families get head lice most often. Young children often have head-to-head contact while playing.
How doctors diagnose it
Finding a live louse on the scalp or hair is the best way to diagnose head lice. Lice are small and fast, so a fine-toothed comb or a magnifying lens can help. Wrong diagnoses are common.
Nits stick firmly to the hair within about a quarter inch of the scalp. Dandruff, hair spray droplets, and dirt are often mistaken for nits. If you find only nits farther than a quarter inch from the scalp, the infestation is probably old and does not need treatment.
Treatment
Treat head lice only if there is an active infestation. Both over-the-counter and prescription shampoos, creams, and lotions are available. Medicines are generally safe and effective when used correctly. Follow the label.
- Use only one product at a time, unless your provider says otherwise.
- Some medicines kill lice and eggs. Others kill only lice, so you treat again about a week later.
- After each treatment, use a fine comb to remove nits and lice every 2 to 3 days for 2 to 3 weeks.
- Check and treat all household members and close contacts at the same time.
If you see no dead lice 8 to 12 hours later, or the lice seem as active as before, the medicine may not be working. Talk to your provider before treating again.
Wash clothes, bedding, and towels used in the two days before treatment in hot water, and dry them on high heat. Soak combs and brushes in hot water for 5 to 10 minutes. Items you cannot wash can be sealed in a plastic bag for two weeks. There is no clear scientific evidence that home remedies such as mayonnaise or olive oil can suffocate lice. Never use kerosene or gasoline. They are dangerous and flammable.
When to see a doctor
Talk to a doctor or pharmacist if you are not sure which treatment to use. Ask your provider about a prescription product if an over-the-counter treatment does not work. See a doctor if scratching sores look infected.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Either can confirm that it is really head lice, suggest a treatment, and check sores from scratching. They can also help with a plan if treatment fails.
Common questions
Are head lice a sign of poor hygiene?
No, getting head lice is not related to being clean. Lice spread mainly by head-to-head contact. Anyone can get them.
Can head lice jump or fly?
No, head lice cannot hop or fly. They move by crawling. This is why they spread mostly through close head-to-head contact.
Do head lice spread disease?
No, head lice do not spread disease. They can cause itching, and scratching can lead to sores that may become infected.
Can pets get head lice?
No, animals do not get or spread head lice.
Sources
- MedlinePlus - Head Lice
- Centers for Disease Control and Prevention - About Head Lice
- Centers for Disease Control and Prevention - Treatment of Head Lice
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
