By Dr. Josh Zeichner
Ever wonder why you’ve got the hair you’ve got, why the hair on your face feels different than the hair on your head, or how -- no matter how often you shave -- it just keeps growing? It’s time to get the facts:
There are many different types of hair on the body, but two main categories are vellus and terminal hairs. Vellus hairs are small and grow no longer than approximately a half-inch. Terminal hairs, on the other hand, are large and can grow to long lengths. Examples of terminal hairs are those on the scalp and in a man’s beard.
Hair growth is regulated by hormones, such as testosterone. During puberty, hormone levels increase and stimulate vellus hairs to transform into terminal hairs, especially in areas such as a man’s beard.
grows at the rate of approximately a half-inch per month in a
Stage 1: Anagen is the actively growing stage. The longer anagen is, the longer the hair will ultimately grow. The duration of anagen differs per body part. For example, in the scalp, anagen may last two to six years, while in the mustache only one to four months. Most hairs are actively growing at any given time, at a rate of approximately a half-inch per month.
Stage 2: Catagen is the hair’s degenerating phase, during which hairs thin and lighten at the base.
3: Telogen, the final
phase, is when hair sheds from the body before a new anagen phase
And lastly, FYI: There is no evidence that shaving causes hair to grow in thicker.