How long have You had Head Lice?

How long have You had Head Lice?

It’s happened and you definitely have head lice! You immediately have a million questions. Where did they come from? What do you do to get rid of them? And probably the scariest of all how long have they been there? It can be unsettling not knowing how long they’ve been crawling around, but we are here to help you get an estimate on how long you’ve had head lice.

The Lice Life-cycle

Lice life-cycle

The best way to determine how long you’ve had lice is to know the life-cycle of head lice and determine where in it the lice are:

  • A lice infestation begins when the lice that have spread to a person’s head begin to lay their nits or eggs.
  • The nits can be found close to the scalp and will begin to hatch within 7-10 days
  • Over the next 7-10 days the nymphs (hatched nits) will continues to grow and mature. Before reaching full maturity, they will shed their exoskeleton three times. During the final molt their gender will be determined based on what is needed in the colony.
  • Once gender is determined females will begin to mate and start the process over.

Female nits will mate only one time but will continue to lay up 10 eggs a day for the rest of their 30-33 day lifespan. You can use this cycle to now determine the estimated length of your infestation.

How Long Have You Had Lice?

Lice egg (nit) stuck to hair

Knowing the details of the lice life-cycle can help you determine the stage your particular outbreak is at and possibly the severity of it. Most infestations are noticed 30 days after the nymphs have reached maturity, making it easier to see the lice in the hair. To examine your scalp wet the hair and comb through it with a fine comb and flashlight. Take note of the different stages: casings (shells from hatching), nits, nymphs, and number of adults. If there are a larger number of nits than adults, it is safe to say you’ve had the infestation longer than 30 days. You can also use the placement of nits to determine the amount of time it’s been. Lice lay nits as close to the scalp as they can and hair grows at the average rate of 1 cm a month. If nits are 1cm from the scalp it’s been one month, 2cm it’s been 2 months, and so on.

What to Do with This Knowledge

diagnosing head lice

Knowing how long you’ve had head lice won’t mean much for how you treat the lice. It can help you determine where you got the lice and inform others you may have come in contact with. Knowing where you got the lice from can help you avoid that situation in the future. Being able to inform others you may have been in close contact with during the unknown time of the infestation can help them get a head start on checking for lice and help prevent further infestations.

How To Get Rid Of Head Lice

Treating head lice

Getting rid of head lice is a lot easier than most think thanks to Lice Clinics America. Our signature AirAllé device removes both head lice and nits in one quick, guaranteed treatment. The AirAllé device uses heat to dehydrate lice without any harsh chemicals. Our professionals are trained and knowledgeable on all things lice and ready to help you get back to being lice free!

Lice Clinics of America has successfully treated 650,000 cases. The company has over 300 clinics in 35 countries, making it the world’s largest network of professional lice treatment centers. Lice Clinics of America - Pearland is located at 4420 Broadway Street, Pearland, Texas 77581 and is open Monday - Sunday by appointment. Call 281-375-3179 or email: or visit for more information or to schedule an appointment.