How many hairs on a person's head

The average person is born with an averageAnatomy, Hair 100 thousand hair follicles (follicles). Hair can grow from each bulb. This number is a short, albeit very rough, answer to the question.

If you want more precision, here's what science has to say.

How many hairs on a person's head

It depends primarily on the color of the hair. Moreover, the key role is played not so much by the shade as by the accompanying quality of the skin.

The thicker the skin, the stronger the hair has to be to break through, and the less it can fit on the head. Blondes have the thinnest hairEncyclopedia of Hair: A Cultural History, the thickest - in red. Therefore, hair counts, according to the Harvard BioNumbers database, are distributed like thisNumber of hairs on human head.

• Blondes - 150 thousand.
• Brown-haired - 110 thousand.
• Brunettes - 100 thousand.
• Redheads - 90 thousand.

True, when calculating, it is necessary to make an allowance for one more important factor. Hair follicles do not grow constantly. Each hair goes three

Anatomy, Hair stages of development: anagen (the hair is actively growing), catagen (an intermediate phase when the hair does not increase in length), telogen (the hair falls out, the hair follicle is "sleeping"). At any given time, 85–90% of the hair is in the stage of active growth - the rest have either fallen out or are about to fall out.

Why some people have more hair than others

Estimating the number of hairs on the head, we are talking not so much about their objective number, but about the density (it is the density of the hairline). This is the number of follicles per square centimeter of skin. The more hairs there are for each unit of area, the thicker the hair seems.

Density is an individual concept. First of all, because it is closely related to the size of the head. For example, a conditional man and woman were born with the same number of hair follicles. But the head (and skin area) of a man is larger, and therefore his hair seems to be sparser than that of a woman.

On average, heads grow on 1 square centimeterDistribution of Human Hair in Follicular Units. A Mathematical Model for Estimating the Donor Size in Follicular Unit Transplantation from 124 to 200 hairs.

Other factors also affect the density. For example, heredity: some people, for genetic reasons, have lower hair density than others. Or excessive hair loss - a situation where there are too many hairs in the telogen phase.

Trichologists consider it normal if up to 100 drops dailyAnatomy, Hair hair. This is a pretty decent bunch, although the loss of such an amount does not affect the density of the hair. But if the number of daily "dropouts" increases, after a while the loss becomes noticeable: the hair is thinning.

The reasons why fall out hair, dozens: from lack of vitamins to prolonged stress or hormonal disruptions. It is important to find out what led to the problem in your particular case, and get rid of the bad factor. First, consult with a therapist or trichologist: experts will tell you how to return the density of the hairline to your usual rate.

How to find out how much hair you have on your head

If for some reason it is important for you to know this, contact a professional trichologist. The specialist will offer to make a computer phototrichogram. This simple procedure will determine the number of hair follicles for each centimeter of scalp.

And if you make a phototrichogram twice with an interval of a couple of days, you will at the same time find out how quickly the hair grows and what percentage of them is in the anagen phase, and what percentage is “sleeping” peacefully.