What are the three phases of the hair growth cycle?

The three phases of the hair growth cycle are anagen, catagen, and telogen.

During the anagen phase, which is the active growth phase, hair follicles are actively producing hair cells. This phase can last for several years, and the length of this phase determines how long hair can grow.

The catagen phase is a transitional stage that follows anagen. Lasting a few weeks, this phase marks the end of active growth. Hair follicles begin to shrink, and the hair strand detaches from the follicle, preparing for the eventual shedding.

Lastly, the telogen phase is the resting stage of the hair growth cycle, during which the hair does not grow but remains attached to the follicle. This phase can last for a few months before the hair is shed and the cycle begins anew with a new anagen phase.

Understanding these phases is crucial in cosmetology, as it helps professionals manage hair treatments and set realistic expectations for clients regarding growth and retention.