I'm 16 and my breasts are relatively average in size(at least I think) But my left breast is quite a bit smaller than my right one. I don't know if this is normal or not, I'm scared it could be a sign of Cancer or some other kind of illness. I would appreciate any information from anyone who is going or has been through similar situations.

Most women's breasts grow unevenly, and usually even out once the growing period is over. Nothing serious to worry about.

Also, it's actually unbelievable, but most women's breasts are uneven after fully grown... most of them are un-noticeable.