Estrogen controls female characteristics like breast growth, whereas testosterone controls male characteristics, such as muscle mass and body hair. That being said, males produce a small amount of estrogen, and females produce a low testosterone amount. High estrogen levels or imbalanced testosterone levels in men cause gynecomastia.
Gynecomastia occurs naturally at different times during a male?s life. These phases are:
After Birth: Newborn boys are still under the effects of the estrogen they got from their mothers while developing in the womb. However, the gynecomastia disappears within a couple of weeks after birth.
At Puberty: Hormone levels change during pubescence. Breast enlargement often goes away six months to two years after the start of puberty.
At Mid-Life and Beyond: Breast enlargement frequently climaxes in men between the ages of 50 and 80. Approximately one in four men in this age range have breast enlargement.
Many other conditions causing gynecomastia are obesity, lack of proper nutrition, tumors in the testicles or adrenal glands, and liver disease. Nonetheless, certain drugs, such as diazepam, spironolactone, and anabolic steroids, can also cause gynecomastia.