In some cases, man boobs stem from overall obesity, known as pseudogynecomastia wherein bigger boobs are from fat deposits and not enlargement of the actual breast glands. But the most common cause of gynecomastia is a hormonal imbalance that leads to estrogen levels going up and/or testosterone levels going down.

Treatment for man-boobs is available here where focused high intensity ultrasonic energy is delivered to deep subcutaneous tissue, producing heat capable of ablating adipose tissue and thermally modifying collagen.

An optimal HIFU frequency is used, which is capable of disrupting adipocytes and contracting collagen fibers to tighten skin.

A high degree of focusing allows ultrasonic energy to pass through the skin and intervening tissue layers above the focal zone at an intensity low enough not to cause undue heating in them.