What is Gynecomastia? Gynecomastia is a disorder where males or boys have enlarged breast tissue. When an adolescent boy is going through puberty changes, the breasts may develop unevenly. The illness is frequently brought on by hormonal imbalance or from consuming estrogen while receiving therapy for prostate cancer. Gynecomastia has also been linked to some drugs, and obesity, however occasionally the exact cause is unknown. Many health blogs claim that gynecomastia is typically not a serious issue because it can go away on its own. The fact that it also causes chest pain and, worse, shame, may make it uncomfortable for men and boys. Causes of Gynecomastia An imbalance of the sex hormones testosterone and estrogen can lead to gynecomastia. Breast tissue grows when estrogen is present but does not expand when testosterone is present. Although both men and women produce both testosterone and estrogen, men normally produce more testosterone than women do. As their hormone levels change