I have read that asthma inhalers are unlikely to cause gynecomastia, however, I have also heard many people with this condition state that they believe their condition is related to inhaler use. My 10 year old grandson has unusually large breasts and he has been using inhalers for the past five years or so and I am concerned for him. Is this something his parents should address with his pediatrician? Please tell me if there is even an outside chance these two things are related. He has also entered puberty and has under arm and pubic hair which seems odd given his age. Thank you.