It is important to address a common misconception: does not cause pubic hair growth. Estrogen is the primary driver of breast development (thelarche), fat redistribution, and vaginal maturation. In fact, estrogen and androgens often have opposing effects on hair. On the scalp, androgens can contribute to androgenetic alopecia (female pattern hair loss), while estrogens tend to prolong the hair growth phase. On the pubis, estrogen plays a supportive, permissive role by increasing the vascularity and thickness of the skin, but it does not initiate the transformation of vellus to terminal hair. A female with ovarian failure but intact adrenal function will undergo adrenarche and develop normal pubic hair, even in the absence of significant estrogen. Conversely, a female with adrenal insufficiency (e.g., Addison’s disease) will fail to produce DHEA and will have sparse or absent pubic hair, even if her ovaries and estrogen production are normal. This clinical dissociation powerfully underscores the primacy of adrenal androgens.
This event is called , which typically occurs between the ages of 6 and 8, often one to two years before the ovaries become fully active. During adrenarche, the zona reticularis—the innermost layer of the adrenal cortex—begins to mature and secrete large quantities of the weak androgens DHEA and DHEA-S. These are the true initiators. The primary trigger for adrenarche remains a subject of research, but the immediate hormonal signal that stimulates the adrenal gland to produce these androgens is Adrenocorticotropic Hormone (ACTH) , secreted by the anterior pituitary gland. ACTH is best known for its role in stress response, but it also has a potent tropic effect on the adrenal cortex, prompting the synthesis of DHEA and DHEA-S. Thus, while ACTH does not directly act on the hair follicle, it is the indispensable upstream hormone that sets the entire process in motion. what hormone causes pubic hair growth in females
To begin, one must appreciate the unique origin of pubic hair. Unlike breast development, which is driven primarily by estrogens from the ovaries, the growth of pubic hair is an process. Androgens are often mislabeled as exclusively “male” hormones, but they are produced in both sexes, albeit in different quantities and with distinct functions. In females, the ovaries and the adrenal glands both produce androgens. However, the critical source for the initiation of pubarche (the onset of pubic hair growth) is the adrenal gland . It is important to address a common misconception: