What is the term for the development of male breast tissue as a side effect of steroid use?

The term for the development of male breast tissue as a side effect of steroid use is gynecomastia. This condition occurs due to an imbalance between testosterone and estrogen levels in the body, which can happen when anabolic steroids are taken. Anabolic steroids can lead to an increase in estrogen levels, either through aromatization (conversion of testosterone to estrogen) or by directly affecting hormonal balance, resulting in the development of breast tissue in males.

Understanding gynecomastia is essential for recognizing the potential side effects of anabolic steroid use and the hormonal changes that can occur in the body as a result. The condition is not simply about increased fat deposits but involves actual glandular tissue development, which distinguishes it from other forms of breast enlargement that may occur due to weight gain.