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How many hairs grow each day

Combien de cheveux poussent par jour
To fully understand what is happening with hair growth, let's first look at their life cycle (hair cycle) and then at some statistics concerning them.

The hair cycle

The growth of the hair is carried out according to a cycle programmed to be repeated approximately 20 to 30 times in the life of each human being. The duration of the hair cycle is rather variable, that means between 2 and 6 years, the hair having a speed of growth and a lifespan proper to each person.

The life cycle of hair involves three phases. The first, called anagen, is that of growth of the hair; it lasts an average of 3 years, but a little longer for women than for men. Then comes the catagen phase, during which the hair stops growing. Thus, for 2 to 3 weeks, the hair follicle is no longer active, the hair is at rest. In the third phase (telogen), a hair in the anagen phase will make go up towards the scalp a hair in dormancy, which will finally die and fall after about 3 months. It goes without saying that hair are not all at the same time in the same phase.

Some statistics

The hair comprises an average of 100,000 to 150,000 hairs: the blond has more (about 150,000), while the russet hair is usually the least dense (75,000 to 90,000). In fact, the hair does not grow in an isolated way, but rather in follicular units, that is small groups of 1 to 4 hairs. We find approximately 50 000 to 65 000 of them on the human scalp.

At any given moment in a person's life, about 80% to 90% of their hair are in phase of active growth (anagen). Only 1% to 2% of the hair is at rest and 15% to 20% of the hair is in the telogen phase. The number of hairs that grows each day is therefore much more important than those that fall. We consider that a normal daily hair loss is usually 40 to 60; but it can climb to 100 in early autumn and spring, without this being considered abnormal.

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