In 2008, 18,000 breast reduction surgeries were performed...on American men.
The number of male breast reduction procedures in England increased from 323 in 2008 to 581 the following year. That's an 80% increase! That makes it the fastest growing cosmetic surgery in the UK. It's even more popular in the US. According to the American Society of Plastic Surgeons, breast reduction is the fourth most popular cosmetic surgery for men, behind nosejobs, eyelid surgery, and liposuction! Some surgeons say that new types of men's magazines are responsible for the increased prevalence of such cosmetic operations. Combine this with the prevalence of obesity (a common cause of "gynecomastia", or excess breast tissue) and you find that more and more men are unhappy with the size of their breasts.
Gynecomastia can also be a side effect of certain prescription medications, or can even show up as a result of using drugs like heroin, methadone, and marijuana.