This phase is defined by significant hair growth due to increased growth activity and hair cell division in the hair follicles. During the Anagen phase, the hair follicle is connected to the scalp's blood supply, which provides essential nutrients and energy for hair growth. Throughout hair cycling for a healthy head of hair, 90% of all follicles are in the Anagen phase and can remain there for anywhere from 2 to 8 years.

This phase marks the end of the growth phase, as cell production is halted. The hair follicle begins to shrink and detach from the scalp's blood supply. The hair shaft begins to separate from the bottom of the follicle to form 'club hair'.

This phase is where the hair follicle become dormant and the hair shaft stops growing. During the Telogen Phase, the 'club hair' is full formed and eventually falls out to make room for new hair growth. This phase usually lasts about 3 months.