Hair Growth Cycles
Every hair follicle goes through a three-stage cycle to grow hair, which repeats itself over time. Active development, also known as the anagen process, is the first stage of this cycle. The catagen process is a stage in between. The resting telogen process is the third step.
Each hair follicle goes through and repeats the cycle of hair growth on its own. And, at any given time, the majority of your hair is in the active increasing Anagen process, which lasts two to six years on average.
The active phase of hair growth lasts the longest, but the Catagen intermediate phase lasts the shortest, lasting two to three weeks.
Finally, during the Telogen process of the cycle, a new Anagen hair pushes out the hair that is already in the follicle. The period of this process is usually three to four months. When Telogen hairs fall out of your brush or comb, you’ll notice them.