I feel weird whenever Im in the girls locker room in gym because my friend always complain how one of her boobs is bigger than the other. Do anyone else have this issue? and what caused it

Nothing wrong..it's natural and part of puberty. It's more noticeable for some. Don't worry about it. :)

Ditto Mona, and tell your friend not to worry about it. If it's noticeable now, differently sized breasts usually even out later in development.

Assure your friend it's perfectly normal. Our bodies are rarely perfectly even anyways; including breasts.

One of my boobs are bigger than the other too...but I think its just normal for one body part to be larger than the other.

It's perfectly normal. The same applies for guys with man boobs.

It's normal because one boob usually starts growing first.

Usually the hand you use more (left/right) will be the bigger one. because you use that muscle more.

my friend wears a DD, one boob is too big for it, one's too small

She cant wear a DD if ones to big and ones to small XD

nothing on anyone's body is completely proportional. your feet aren't the same size. your legs aren't the same length. your breasts aren't the same size in most cases. don't fret.

Its natural, i heard that technically everything on your right side is bigger than the other....but i do notice that one boob is slightly bigger than the other...x]

What is she supposed to wear then?
they dont really make bras that are two different sizes... she's just compromising.

Don`t all girls have one boob bigger than the other?

Don't know why, but the phrase "perfectly symmetrical boobs" is hilarious.

I don't know about perfectly symmetrical, but one in four girls have one boob, under careful inspection, that is larger than the other.

yeah thats normal for every girl. you may not notice it but on others, you will. ive been told that if youre right handed then your right boob will be bigger. i dont know. but the same applies to a guys, excuse the language, balls. one is bigger than the other.

I'll you this now - mines are not perfect. One is a tiny bit bigger. There you go, problem solved. lol

but i'm right handed and my right boob is way smaller than my left.