Causes of Early Puberty
The causes of early puberty are often unclear. However, they generally fall into two categories: central (true) precocious puberty and peripheral (pseudo) precocious puberty. Central precocious puberty is the most common type and occurs when the brain’s hormonal signals. Furthermore, these control puberty starting too early. Peripheral cases are less common and result from hormone production in other parts of the body. Outside of the normal brain-pituitary-gonad pathway.
In central early puberty, the brain releases a hormone called gonadotropin-releasing hormone (GnRH) earlier than expected. This stimulates the pituitary gland to produce luteinising hormone (LH) and follicle-stimulating hormone (FSH). Which trigger the ovaries or testes to begin producing sex hormones—oestrogen in girls and testosterone in boys.
In most girls, central precocious puberty is idiopathic, meaning there is no known cause. In boys, however, it is more likely to be linked to an underlying issue, such as a brain tumour, head injury, spinal cord abnormalities, or congenital brain malformations. Infections such as meningitis or encephalitis can also affect the brain and trigger premature puberty.
Peripheral Early Puberty
Peripheral early puberty happens when the sex glands or other parts of the body produce hormones without signals from the brain. This can be due to adrenal gland disorders, ovarian or testicular cysts, or hormone-secreting tumours. In rare cases, exposure to external hormones—such as from creams, supplements, or contaminated food—can lead to early changes.
Genetic conditions like McCune-Albright syndrome and congenital adrenal hyperplasia are other known causes. These conditions may be diagnosed through hormone tests, imaging scans, and blood work.
In South Africa and other developing countries, environmental factors may also play a role. These include exposure to endocrine-disrupting chemicals (EDCs) found in plastics, pesticides, and some household products. Studies suggest that early puberty may be linked to increased body weight or obesity, which can disrupt hormone levels and accelerate development.
Causes of Early Puberty
Family history is another risk factor. If one or both parents experienced early puberty, the chances are higher that their children may too. Certain ethnic groups also tend to show earlier signs of puberty compared to others, due to both genetic and environmental influences.
Understanding the causes of early puberty helps doctors determine the best approach to treatment. Not all children need medical intervention, but identifying the underlying reason is important—especially if it signals a more serious condition. With early detection, children can receive the right care and support at every stage of development.
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