• Breast growth in men, also known as gynecomastia, is usually tied to fluctuating hormone levels. The cause of those hormonal changes varies widely, from life stage to drug abuse or disease.


    Some young men going through puberty experience breast growth, according to Medline Plus, a service of the National Institutes of Health. Fluctuations in androgen and estrogen levels, the hormones responsible for male and female characteristics, cause the condition.

    Drug Side Effect

    In some cases, breast growth in men is a side effect of a prescription drug. This is because certain chemicals in the drug may either mimic the effects of estrogen or cause decreased testosterone levels.

    Anabolic Steroid Use

    Steroid abuse may result in breast growth in men because the drug disrupts normal hormone production, according to the National Institute on Drug Abuse.

    Liver Disease

    The liver is a vital organ for hormone production and circulation. When its function is impaired, male breast growth may result, states Medline Plus.


    Older men may experience breast growth, according to Medline Plus. Changing hormone levels are responsible for the condition.


    Medline Plus: Gynecomastia

    National Institute on Drug Abuse: Steroid Use

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