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- National Center for Biotechnology Information - Precocious Puberty (Oct. 25, 2026)
precocious puberty
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What is precocious puberty?
Precocious puberty is the abnormally early start of sexual development. In girls, it's the onset of menstruation before age 8, and in boys, it's sexual development before age 9. True precocious puberty involves normal pubertal development at an abnormally early age, even as early as age 2.
In girls, early puberty leads to adult cyclic function, including ovulation, making pregnancy possible. Estrogen production rises, stimulating skeletal growth but also causing premature closure of the epiphyses, leading to short stature. The cause is often unknown but can be due to hypothalamic tumors. Treatment is important for psychological and social reasons and to prevent short stature.
In boys, true precocious puberty involves premature activation of the hypothalamic-pituitary-testes axis, leading to virilization and growth acceleration, but also premature closure of the epiphyseal disks and short stature. Causes include hypothalamic and other brain tumors, brain injuries, and brain disorders. Treatment may involve neurosurgery or long-acting GnRH derivatives.
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At what age does puberty usually start, and when is it considered early?
Precocious puberty is the abnormally early onset of sexual development. In girls, it is defined as the onset of menstruation before age 8, while in boys, it is defined as sexual development before age 9. In true precocious puberty, normal pubertal development occurs at an abnormally early age, sometimes as early as age 2.
Early onset of puberty in girls can lead to adult cyclic function, including ovulation, and can result in pregnancy. The increase in estrogen production stimulates skeletal growth, which may result in short stature. The causes of precocious puberty in boys include hypothalamic tumors, brain tumors, traumatic brain injuries, and brain disorders. However, in some boys, no cause can be found.
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What are the common signs of precocious puberty?
Precocious puberty is the abnormally early onset of sexual development. In girls, menstruation before age 8 is a sign, while in boys, it's sexual development before age 9.
Common signs in girls:
* Breast enlargement
* The appearance of pubic hair
* Rapid growth
* The start of menstruationCommon signs in boys:
* Enlargement of the testes and scrotum
* The appearance of pubic hair
* Rapid growth
* Voice changes
* AcneIf a child shows these signs, evaluation is essential to determine the cause and appropriate treatment.
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What causes precocious puberty to occur?
Precocious puberty, or abnormally early sexual development, has different causes depending on whether it is true precocious puberty or precocious pseudopuberty. True precocious puberty results from the early activation of normal pituitary-gonadal function, sometimes as early as age 2. In girls, most cases are idiopathic, but some are caused by hypothalamic tumors. In boys, causes include hypothalamic and other brain tumors, brain injuries, and brain disorders, but can also be idiopathic.
Precocious pseudopuberty, on the other hand, is caused by the autonomous production of sex hormones. In girls, this is usually due to ovarian tumors, tumors that secrete human chorionic gonadotropin, or exposure to external estrogen. In boys, it may be caused by liver or other tumors that secrete human chorionic gonadotropin, adrenal or testicular tumors, or exposure to exogenous androgens.
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How can doctors diagnose precocious puberty?
Doctors can diagnose precocious puberty by observing the early onset of puberty, which is defined as before age 8 in girls and age 9 in boys. In girls, this early onset is followed by adult cyclic hypothalamic-pituitary-ovarian function, including ovulation, and in boys, there is premature activation of the hypothalamic-pituitary-testes axis, with spermatogenesis.
To determine the cause of precocious puberty, doctors must evaluate affected children carefully. For instance, in boys, damage or disorders of the brain are the primary causes of true precocious puberty.
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What treatments are available for children with precocious puberty?
Precocious puberty is the abnormally early onset of sexual development, before age 8 in girls and before age 9 in boys. Treatment is crucial for social, psychological, and physical development.
The most common treatments involve gonadotropin-releasing hormone (GnRH) agonists like goserelin, leuprorelin, and triptorelin. These medications interfere with GnRH, decreasing the production of hormones such as estrogen and testosterone, thus suppressing puberty. For boys, if the cause of precocious puberty is related to brain damage or disorders, neurosurgical intervention may be necessary.
Other treatments include antiandrogens, antiestrogens, and progestins. Girls with precocious pseudopuberty need to be evaluated to find the cause of the condition, such as an ovarian tumor, and treated accordingly.
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precocious puberty, abnormally early onset of human sexual development. In girls, precocious puberty is defined as the onset of menstruation before age 8, and in boys it is defined as sexual development before age 9. True precocious puberty is characterized by normal pubertal development at an abnormally early age, sometimes as early as age 2.
Precocious puberty in girls
In girls, early onset of puberty is followed by adult cyclic hypothalamic-pituitary-ovarian function, including ovulation; thus, a young girl affected by the disorder can become pregnant. The rise in estrogen production also stimulates skeletal growth, followed by premature closure of the epiphyses (expanded ends of the long bones), with eventual short stature. In most girls the cause of this disorder is unknown (idiopathic), and affected girls are otherwise normal. Occasionally it is caused by a tumour or other abnormality of the hypothalamus that results in the secretion of gonadotropin-releasing hormone (GnRH). GnRH stimulates the release of female gonadotropins (i.e., luteinizing hormone and follicle-stimulating hormone) from the pituitary gland, and these hormones in turn stimulate the growth and development of the ovaries.
Treatment is important for proper psychological and social development and to prevent short stature. In the past, affected girls were often treated with a progestin (a natural or synthetic agent with effects similar to progesterone), thereby inhibiting the secretion of gonadotropins from the pituitary, which resulted in some regression of breast development and cessation of menstruation but often did not prevent short stature. This form of treatment has been superseded by long-acting derivatives of GnRH that down-regulate GnRH receptors on the gonadotropin-secreting cells of the pituitary. Thus, gonadotropin secretion decreases, ovarian function ceases, and, in most girls, pubertal development gradually declines and growth rate slows.
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Precocious pseudopuberty is partial pubertal development that results from autonomous (gonadotropin-independent) production of estrogen in prepubertal girls. Affected girls have premature development of their breasts and pubic hair, experience rapid growth, and may have irregular vaginal bleeding (due to the stimulatory effects of estrogen alone on the endometrium). However, these girls do not have true menstrual cycles and are not fertile. Precocious pseudopuberty is usually caused by an ovarian tumour, a chorionic gonadotropin-secreting tumour (tumours that secrete a hormone normally produced by the placenta that stimulates the ovaries), or exogenous estrogen (e.g., certain environmental or industrial chemicals). Affected girls must be evaluated carefully to find the cause of the disorder, and they must be treated accordingly—for example, by removal of the tumour.
Precocious puberty in boys
Boys, similar to girls, can undergo true precocious puberty or various forms of precocious pseudopuberty. In true precocious puberty there is premature activation of the hypothalamic-pituitary-testes axis, with spermatogenesis, virilization, and growth acceleration, which paradoxically causes premature closure of the epiphyseal disks and short stature. The causes of precocious puberty in boys include hypothalamic tumours and other brain tumours, traumatic brain injuries, and various brain disorders. However, in some boys no cause can be found (idiopathic precocious puberty). Because damage to the brain or disorders of the brain are the primary causes of true precocious puberty in boys, neurosurgical intervention may be needed. If neurosurgical intervention is unsuccessful or if no cause is found, affected boys can be treated with long-acting derivatives of GnRH that down-regulate GnRH receptors on the gonadotropin-secreting cells of the anterior pituitary. Thus, gonadotropin secretion decreases, testicular function ceases, and, in most boys, growth rate slows.
Precocious pseudopuberty is partial pubertal development that results from autonomous (gonadotropin-independent) production of testosterone in a prepubertal boy. Affected boys have premature virilization and rapid growth, but they do not produce sperm. Precocious pseudopuberty may be caused by a liver tumour or other tumour that secretes human chorionic gonadotropin (a hormone normally produced by the placenta), an adrenal or testicular tumour, congenital adrenal hyperplasia, a mutation that results in activation of the luteinizing hormone receptor (testotoxicosis), or exogenous androgen (e.g., caused by the intake of steroid drugs). Similar to girls, affected boys must be evaluated to find the cause of the condition, and they must be treated accordingly.