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    Precocious puberty

    Pubertas praecox

    Puberty is the time during which a person's sexual and physical characteristics mature. Precocious puberty is when these body changes happen earlier than normal.


    Puberty usually begins between ages8 and 14 for girls and ages9 and 16 for boys.

    The exact age a child enters puberty depends on a number of factors, including family history, nutrition, and gender.

    Often there is no clear cause for precocious puberty. Some cases are due to changes in the brain, genetic problems, or certain tumors that release hormones. These conditions include:

    • Disorders of the testicles, ovaries, or adrenal glands
    • Tumor of the hypothalamus (hypothalamic hamartoma)
    • Tumors that release a hormone called hCG


    In girls, precocious puberty is when any of the following develop before age 8:

    • Armpit or pubic hair
    • Beginning to grow faster
    • Breasts
    • First period (menstruation)
    • Mature outer genitals

    In boys, precocious puberty is when any of the following develop before age 9:

    • Armpit or pubic hair
    • Growth of the testes and penis
    • Facial hair, often first on the upper lip
    • Muscle growth
    • Voice change (deepening)

    Exams and Tests

    The doctor will perform a physical exam to check for signs of precocious puberty.

    Tests that may be ordered include:

    • Blood tests to checkhormone levels
    • CT or MRI scan of the brain or of the abdomento rule out tumors.


    Depending on the cause, treatment for precocious puberty may include:

    • Medicationsto stop the release of sexual hormones
    • Surgery to remove a tumor

    Children who go through puberty too early may not reach their full height because growth stops too early.

    Children with early sexual developmentmay have psychological and social problems. Children and adolescents want to be the same as their peers. Early sexual development can make them appear different. Parents can support their child by explaining the condition and how the doctor plans to treat it.

    When to Contact a Medical Professional

    See your health care provider if:

    • Your child shows signs of precocious puberty
    • Any child with early sexual development appears to be having problems in school or with peers


    Garibaldi L, Chemaitilly W. Disorders of pubertal development. In: Kliegman RM, Stanton BF, St. Geme JW III, et al., eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 556.

    Styne DM, Grumbach MM. Puberty: ontogeny, neuroendocrinology, physiology, and disorders. In: Kronenberg HM, Melmed, S, Polonsky KS, Larsen PR, eds. Williams Textbook of Endocrinology. 12th ed. Philadelphia, Pa: Elsevier Saunders; 2011: chap 25. 24.


    • Endocrine glands


    • Male and female reproduc...


      • Endocrine glands


      • Male and female reproduc...


      A Closer Look

        Self Care

          Tests for Precocious puberty

            Review Date: 8/22/2013

            Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

            The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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