Gynecomastia

摘要

What is gynecomastia? Gynecomastia is breast enlargement in boys or men due to a benign (non- cancerous) increase in breast tissue. This condition results from an imbalance between testosterone (a male hormone) and estrogen (a female hormone). All males have some estrogen. But too much estrogen can cause breasts to grow. Although gynecomastia doesn’t cause health problems, it can make breasts tender and can be embarrassing.