1) Growth phase: anagen. The hair is full of life, its growth is constant and regular, and its root fills the hair follicle all the way to the base. Length: from 2 to 7 years, depending on gender and personal characteristics.
2) Recession phase: catagen. The hair is between life and death. Its root climbs towards the epidermis, loses some volume and its activity suddenly stops. The hair therefore stops growing, but stays in place for another 2 to 4 months.
3) Expelling phase: telogen. The hair is dead but it stays on the head until the root of the hair replacing it is strong enough to remove it. Length: 2 to 4 months.
4) Hair Loss: The freshly regrown hair makes it to the scalp’s surface and the old hair falls naturally.
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