I'm curious about male gynecomastia.

My groom has gained weight and his chest has become larger, so I'm worried about gynecomastia. He was originally a thin person, but suddenly gained weight, and his chest has grown and gained fat. I heard there is something called gynecomastia, so I was worried and looked it up. I wanted to hear real stories from people who have experienced it, so I decided to ask. If the chest protrudes more than the abdomen, I think it's worth suspecting.