precocious puberty

Precocious puberty means puberty arrives much too early, with the body starting to develop sexual characteristics before it is age-appropriate, conventionally before about age 8 in girls and 9 in boys. It is as if the pubertal program runs ahead of the calendar.

Doctors divide it into two mechanisms. Central precocious puberty is the gonadal axis switching on early: real GnRH pulses, real LH and FSH, real gonadal hormones, just premature. Peripheral precocious puberty is driven by sex hormones coming from somewhere other than a brain-triggered gonad, such as an adrenal disorder, an ovarian or testicular tumor, or an external hormone source, with the brain axis still quiet.

The signs mirror normal puberty but at the wrong time: early breast development or menarche, early testicular or penile growth, body hair, acne, body odor, and an early growth spurt. Distinguishing the central from the peripheral form, often with a GnRH stimulation test, is the key diagnostic step.

A counterintuitive consequence is the impact on height. Early sex hormones at first make the child taller than peers, but they also speed up bone maturation and close the growth plates early, so without treatment the child may end up shorter as an adult. Central precocious puberty can often be paused with GnRH analog therapy to protect adult height and ease the social burden.