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 must be to break through, and the less it can fit on the head. The finest hair is for blondes in the Encyclopedia of Hair: A Cultural History, the thickest for redheads. Therefore, the number of hairs, according to the Harvard BioNumbers database, is distributed like this Number of hairs on human head.

Blondes - 150 thousand.
Brown-haired women - 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 hairline goes through 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, Distribution of Human Hair in Follicular Units grow on 1 square centimeter of the head. 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 a 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 Anatomy, Hair of hair falls out daily. 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.

There are dozens of reasons why hair falls out: from a lack of vitamins to prolonged stress or hormonal disruptions. It is important to find out what led to the problem specifically in your case, and get rid of the bad factor. To get started, 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 per centimeter of scalp.

And if you take 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.