What is catagen?

Catagen is the transitional phase of the hair growth cycle that follows the anagen (growth) phase and precedes the telogen (resting) phase. During catagen, hair follicles shrink and the hair strand is detached from its blood supply, leading to the cessation of active growth. This phase lasts for a few weeks, during which the hair may begin to shed as it prepares to enter the resting stage. Ultimately, catagen is crucial for the natural renewal of hair.