In pubescent boys, a temporary enlargement of the breasts is caused by

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Pubescent boys can experience temporary breast enlargement due to increased estrogen production. During puberty, testosterone levels increase but so does the enzyme aromatase, which converts some of the testosterone into estradiol (a form of estrogen). This can lead to a temporary imbalance in hormone levels, causing breast tissue to grow. However, this usually resolves on its own within a few months to a couple of years.

In Pubescent Boys, a Temporary Enlargement of the Breasts Is