What Is Precocious Puberty?
Precocious puberty, also known as early onset puberty, is when a child starts to develop sexual characteristics earlier than expected.
In girls, it refers to the development of secondary sexual characteristics (such as breasts and pubic hair) before the age of 8. In boys, it refers to the onset of these characteristics before the age of 9. Precocious puberty is considered rare, affecting about 1 in 5,000 to 10,000 children. It’s important to identify this condition early and take appropriate steps if you suspect your child is experiencing early onset puberty.
The exact causes of precocious puberty are still not fully understood. However, researchers have identified several factors that may contribute to its development.
The natural progression of precocious puberty involves the premature activation of the hypothalamus-pituitary-gonad (HPG) axis, which controls puberty. This early maturation of the HPG axis is associated with gonadotropin-dependent (central/true) precocious puberty. In some cases, there may be an underlying cause for precocious puberty, such as genetic mutations or central nervous system abnormalities. However, in many cases, the cause remains unknown (idiopathic).
Causes of precocious puberty include:
- Genetic factors: Some genetic mutations, such as mutations in the kisspeptin gene (KISS1) and its receptor (KISS1R), as well as a gene passed down on the father's side, called MKRN3, may play a role in early onset puberty.
- Environmental factors: Exposure to products containing testosterone or estrogen, such as birth control pills, hormone creams, and ointments, can potentially trigger precocious puberty.
- Radiation Treatment: Radiation treatment of the brain or spinal cord for conditions like tumors or leukemia may also be a risk factor for precocious puberty.
Non-modifiable risk factors for precocious puberty are factors that can’t be changed. These include:
- Gender: Precocious puberty affects girls at a much higher rate than boys.
- Race: African-American children have a higher risk of developing this rare condition.
- Family History: Children with family members with precocious puberty may have an increased risk.
Modifiable risk factors for precocious puberty are factors that can be influenced or changed. These include:
- Obesity: Studies have shown that obesity, especially central obesity (excess fat around the stomach), is associated with an increased risk of earlier pubertal development.
- Vitamin D deficiency: Low levels of vitamin D in the body have been linked to over a 3-fold increased risk of precocious puberty in girls.
The most common early symptoms of precocious puberty in both boys and girls are:
- Rapid growth spurt
- Development of pubic and underarm hair
- Acne
- Adult body odor
In girls, other symptoms of precocious puberty may include:
- Start of menstruation
- Breast development
In boys, other symptoms of precocious puberty may include:
- Enlarged testicles and penis
- Growth of facial hair
- Spontaneous erections and ejaculations
- A deepening voice
As precocious puberty progresses or becomes more severe, additional symptoms may occur. These can vary depending on the individual and the underlying cause of precocious puberty. Some possible symptoms that may occur with later stages or higher severity of precocious puberty include:
- Decreased adult height
- Inappropriate body shape
- Mental or behavioral abnormalities
To diagnose precocious puberty, healthcare providers commonly perform the following examinations, tests, and procedures:
- Medical history review: Healthcare providers will gather information about medical history and any previous diagnoses.
- Physical exam: During a physical exam, a healthcare provider will look for physical signs of a medical problem, such as pain, swelling, or the presence of masses in the body.
- Lab tests: Specific lab tests may be recommended by your healthcare provider. These may include a blood draw to check hormone levels.
- Imaging studies: Imaging studies such as X-rays or MRI scans may be performed to evaluate the body system being affected. For example, an X-ray can help determine the age of the child's bones.
- Other procedures: Depending on the information gathered and the results of the physical exam, clinical procedures may be recommended. These can help determine a diagnosis and may include tests like a hearing test or a gonadotropin-releasing hormone (Gn-RH) stimulation test.
To determine the stage or severity of precocious puberty, additional examinations, tests, and procedures may be performed:
- Tanner staging: Tanner staging is used to rate sexual maturity and assess how far into puberty a child is. It looks at physical development and can help guide treatment decisions.
- Hormone level testing: Bloodwork can be done to check hormone levels, such as testosterone in boys and progesterone in girls. This can help confirm a diagnosis of precocious puberty.
- Ultrasounds: Abdominal (stomach) and pelvic ultrasounds may be performed to look for any tumors or abnormalities that could be causing precocious puberty.
- MRI scans: A magnetic resonance imaging (MRI) scan may be recommended to examine the pituitary gland or other areas of the brain for any problems that could be contributing to precocious puberty.
It's important to follow up with your healthcare provider if any symptoms worsen or change after a physical exam. They will guide you through the necessary examinations, tests, and procedures to make an accurate diagnosis and determine the stage or severity of precocious puberty.
The goals of treatment for precocious puberty depend on the type of precocious puberty your child has.
Treatment goals for people with central precocious puberty (CPP) are to pause the early maturation of the hypothalamic-pituitary-gonadal axis, which is responsible for the production of sex hormones.
The main medication used for CPP is called a GnRH agonist. This medication helps slow by puberty by blocking the production of luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which are responsible for triggering puberty. GnRH agonists can be given as injections every one to three months or as an implant that slowly releases medication over a year. By slowing down puberty, this treatment may allow your child to grow taller than they would without any treatment. After about 16 months, the treatment is usually stopped and puberty resumes.
Peripheral recocious puberty (PPP) is another type of precocious uberty that’s usually caused by an underlying condition, such as a tumor. Therefore, treating the underlying cause may be enough to stop the early onset of puberty. In addition to treating the underlying condition, medications may also be prescribed to stop the premature production of hormones like estrogen and testosterone.
It's important to note that treatment for precocious puberty aims to preserve your child's potential for achieving acceptable adult height and reduce emotional distress. By suppressing the production of sex hormones, these treatments can help delay puberty and allow your child more time to grow before reaching their final height.
Complications can occur with precocious puberty. Children affected by precocious puberty may initially be taller than their peers due to early bone maturation. However, because their growth plates seal at a younger age, they often end up being shorter than average in adulthood. Additionally, children may experience emotional and psychological challenges due to the early physical changes they go through. Complications such as low self-esteem, depression, and substance misuse can occur later on.
Remember to always consult with a healthcare professional if you have concerns about precocious puberty or any other health condition. They will be able to provide personalized advice and guidance based on your specific situation.