To clinically track the progression of puberty, doctors utilize a scale known as the Tanner Stages. This system divides the development of pubic hair into five distinct phases, illustrating that growth is a gradual process rather than a single event.
The growth of pubic hair is driven by a complex hormonal cascade. It begins in the brain with the hypothalamus, which releases gonadotropin-releasing hormone (GnRH). This signals the pituitary gland to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH). These hormones stimulate the testes to produce testosterone. While testosterone is the primary male hormone responsible for muscle growth and voice changes, the development of pubic hair is specifically triggered by androgens, particularly a hormone called dihydrotestosterone (DHT), which is derived from testosterone. Additionally, the adrenal glands produce weak androgens that contribute to the early stages of pubic hair growth. what age do boys get pubic hair
Developed by James Tanner, this visual scale is the clinical standard. To clinically track the progression of puberty, doctors