The cycle and life of hair.

Our hair, as hairs in general, are characterized by a growth and then a fall that fortunately is never synchronized in all body, despite what happens in many animals where they periodically loose and regain or change their hairs.

Fortunately man does not get bold and then hairy because hair is always in different evaluative phases. So some hairs fall and other are maturing, some other are born.

These phases are well know and are called:

Anagen

Catagen

Telogen

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Anagen Phase:

this phase is characterized by the growth of the hair. Starting from the follicle, we have a cellular reproduction that generates the hair.
It can last some years and it lasts more in women than in men.

Catagen Phase:

it is the time that follows the Anagen Phase and it is characterized by the quiescence in the growth. We do not have any extension of hair.

It lasts few weeks.

Telogen Phase:

in this phase, the hair is ready to fall off. Once they fall, after a short amount of time, the bulb starts to deepen more and restart to form cells. It is starting a new Anagen Phase.

A loss of 80-100 hairs per day is normal.

In a normal trichogramma (the test that helps to establish the percentages of hair in the different phases) about the 85% of hair is in Anagen Phase, the 15% in the Telogen one and only the 1-2% is in the Catagen Phase.