Well I noticed some breast pain in my left breast earlier today. It wasn't constant and only felt like a minor throb. There is no redness, discharge, rash, or lumps because I did a self examination and I can't feel anything. I heard that inverted nipples can be a sign of concern but I don't know what that looks like. Both nipples stick out my left one is just a bit flatter than the right.Like the middle is indented a little but its not like entirely sucked up in there. Should I be concerned? I'm 23 and in the middle of my menstruation week but breast cancer could happen to anybody