Is head lice a sign of poor personal hygiene?

No, head lice are not a sign of poor personal hygiene. This is a common myth and is incorrect. Head lice are small parasites that live on the human scalp and feed on blood, and their presence is not related to how clean the hair or body is [1]. Anyone can get head lice regardless of their level of hygiene.

Head lice spread primarily through direct head-to-head contact with an infested person. Lice cannot jump or fly; they crawl from one hair to another [1]. For this reason, infestations often spread among children in preschool and elementary school (ages 3 to 11) and their family members, as they tend to have direct contact while playing [1].

How do head lice spread?

The most common spread of head lice is through direct head-to-head contact. Although less common, lice can also spread by sharing certain personal items that touch the head, such as hats, scarves, hairbrushes, combs, or hair ties [1]. Lice can also be transmitted by lying on beds, couches, pillows, or carpets that have recently been in contact with an infested person [2]. However, adult lice cannot live away from a human head for more than two days if they cannot feed [2].

Symptoms of head lice infestation

Some people may show no symptoms, especially during the first infestation or when the infestation is mild [2]. However, the most common symptom is frequent itching of the scalp, which results from an allergic reaction to lice bites [1]. It may take four to six weeks for itching to appear for the first time in an infested person [2]. Other symptoms include:

• A tickling sensation or feeling of movement in the hair [1].
• Irritability and difficulty sleeping, as lice are more active in the dark [1].
• Sores on the scalp caused by scratching, which may sometimes become infected with bacteria [1].

To diagnose head lice, you must see a live louse or a nit (egg) firmly attached to a hair shaft about a quarter-inch from the base [2]. Nits are often found behind the ears and at the nape of the neck [2].

Treatment and prevention

Effective treatments for head lice are available, both over-the-counter and by prescription. Common treatments include shampoos, creams, and lotions containing ingredients such as permethrin or pyrethrins [3]. It is important to follow the product instructions carefully, including how long to leave the medication on the hair and how to rinse it [1]. In many cases, retreatment is recommended after 7-10 days to kill any newly hatched lice before they can lay new eggs [3]. After rinsing, a fine-toothed comb should be used to remove dead lice and nits [1].

To prevent the spread of head lice, it is recommended to take the following steps:

• Avoid direct head-to-head contact during play and other activities [2].
• Do not share clothing or personal items that touch the head, such as hats or hair ties [2].
• Wash clothing, bedding, and towels in hot water and dry them using the hot cycle [1].
• Soak combs and brushes in hot water for 5-10 minutes [1].
• Vacuum floors and furniture, especially areas where the infested person sat or lay down [1].

If you suspect your child has head lice, it is important to review school or daycare policies, as the child may not be able to return until the lice are fully treated [1]. For detailed information on treatment and prevention in the school environment, you can visit Head lice: Methods of infection, effective treatment, and prevention in schools (Arabic).

When to see a doctor?

If over-the-counter treatments do not work, if there is doubt about the diagnosis, if you are pregnant or breastfeeding, or if you wish to use treatment for a young child, you should consult a healthcare provider or pharmacist [1]. You should also consult a doctor if sores on the scalp appear due to scratching and become inflamed, as they may require antibiotic treatment.

Medical references

• Head Lice
• About Head Lice
• Clinical Care of Head Lice