The hair growth cycle consists of three main phases: anagen, catagen, and telogen. The anagen phase is the active growth stage, lasting several years, during which hair follicles produce new hair. The catagen phase is a short transitional period that lasts a few weeks, where hair growth slows and the follicle shrinks.
Finally, the telogen phase is the resting stage, lasting several months, during which hair is shed and new hair begins to form in the follicle. This cycle repeats continuously, with each hair follicle operating independently, leading to the natural shedding and regrowth of hair.