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Early Puberty in Boys


What is early puberty?

Puberty is considered early in boys if it occurs before the age of 9. Early puberty may also be called precocious puberty. The signs of puberty in boys include:

  • increased size of the testicles
  • development of pubic, underarm, or facial hair
  • a big growth spurt.

Is early puberty a problem?

Early puberty may become a problem for a child. If it is not treated, early puberty can cause a boy to stop growing before reaching his expected height.

What is the cause?

Often there is no apparent cause. Sometimes early puberty runs in the family or there may be something affecting the release of hormones in the brain. All boys with early puberty should be checked by their healthcare provider.

How is it diagnosed?

Your child's healthcare provider will examine your son and measure height, weight, and bone age. Your provider checks the bone age by doing a simple X-ray of the hand and wrist to measure of the body's overall bone maturity. Your provider will also ask about your family history of early puberty.

Depending on the results of these tests, your son may need a blood test to check his hormone levels. Sometimes, an MRI of the brain is done to check if anything is affecting the gland responsible for releasing hormones. A specialist, called a pediatric endocrinologist may need to see the results of the tests.

What is the treatment?

Treatment is needed if early puberty is likely to cause your son not to reach his expected height. Early puberty can often be stopped with a medicine called Lupron. This medicine mimics a natural hormone in the body and is given as a shot once per month. It has no known side effects, and once the shots are stopped, puberty begins again normally.

Your provider may want to see your son every 4 to 6 months to check on his growth.


Written by Aristides Maniatis, MD.
Published by RelayHealth.
Last modified: 2011-02-09
Last reviewed: 2010-12-29

This content is reviewed periodically and is subject to change as new health information becomes available. The information is intended to inform and educate and is not a replacement for medical evaluation, advice, diagnosis or treatment by a health care professional.

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