Sometimes gynecomastia may go away on its own following puberty and the return of the hormone levels to normal. It can also be treated by discontinuing the use of steroids, marijuana, and some types of medications.
Lifestyle changes like a healthy diet and proper exercise can help reduce breast fat, potentially decreasing the size of the breasts. However, losing weight won’t make the gynecomastia-related enlarged breast tissue go away. In the majority of cases, it can only be removed surgically.