Chin hair, like all body hair, grows in three distinct phases:

Anagen (Growth Phase):
This is when the hair actively grows.

Catagen (Transitional Phase):
A short phase where growth stops and the hair detaches from its blood supply.

Telogen (Resting Phase):
The hair rests before shedding, allowing new growth to begin.

Several factors influence chin hair growth, with androgens—male hormones found in both men and women—playing a key role. Increased androgen levels or heightened sensitivity to these hormones can lead to more noticeable facial hair, especially on the chin.