I’m a guy, but I have what looks like a girl’s breasts. Why is this happening?

During puberty, some guys may develop swollen breasts. While this might seem weird, it’s nothing to be concerned about. If it happens to you, don’t worry—it’s just a part of growing for some guys. It happens because some hormones cause the tissue at the breast to swell. It does go away for most guys, usually within two years. For other guys, it usually goes away by age 18. If it is stressing you out, ask a doctor or health care provider about it.