How many growth cycles does human hair go through?

Human hair goes through three distinct growth cycles, which include the anagen, catagen, and telogen phases.

During the anagen phase, which can last several years, hair follicles actively produce new hair, resulting in significant hair growth. The duration of this phase can vary from person to person and is influenced by factors such as genetics and overall health.

The catagen phase follows, a transitional stage lasting about two to three weeks where hair growth slows, and the hair follicle begins to shrink. During this time, the hair is not actively growing but is still attached to the follicle.

Finally, the telogen phase is a resting stage that lasts around three months on average. At this point, the hair is not growing and is eventually shed. After the telogen phase, the cycle begins anew with another anagen phase, starting the process over again.

Understanding these growth cycles is essential for estheticians, especially when considering hair treatments, wash schedules, and overall hair health.