The stages of hair growth consist of the Anagen, Catagen, and Telogen phases. During the Anagen phase, new hair cells are produced at the root of each follicle. This is followed by a transition period (Catagen) during which the follicle shrinks and detaches from its blood supply. Finally, in the Telogen phase, a resting period, the hair follicle rests in preparation for a new growth cycle.