Human hair follicles produce hair both on the head and elsewhere on the body. The hair begins to come out of the root or follicle. As it develops, it pushes up the hair on it. It stops in some parts of the body when it reaches a certain length. But the head is unique. The hairs on the top of the head (for men and women) and the beard (for men) continue to grow indefinitely, but this growth may slow down over time.
Growing human hair is a natural biological process that occurs in hair follicles. Hair growth involves a cycle of phases: anagen (growth), catagen (transitional), and telogen (resting).