Chin hair grows in three stages—anagen (growth), catagen (transition), and telogen (rest)—like all body hair. Hormones, especially androgens (present in both men and women), play a big role. As the article notes, “An increase in androgen levels or heightened sensitivity to these hormones can result in more noticeable facial hair.”

Genetics are another key factor. Some people are simply predisposed to having more or thicker chin hair. The article explains, “Genetics also play a key role in chin hair growth, influencing the density and distribution of hair follicles.”