I have recently been diagnosed with benign gynecomastia. I have been a heavy drinker for about a decade and been using otc antacids, which have been postulated as the cause. However, I insist that the breast growth, which is predominantly on the left side, occurred over the course of one or two weeks. I had severe pain at the time and also a swollen lymph node in my left arm pit that may have been merely coincidental. My doctor says that I should wait for it to regress or consider surgery for cosmetic purposes. Will this issue resolve on its own, and why would this happen so suddenly? My hormone levels are within normal range, and it has been 3 months since it occurred with only slight improvement.