A lot of things come in matched sets, but breasts aren't usually one of them. Breast asymmetry—when breasts vary in size, shape, or position—is very common. It's considered normal when even fully developed breasts aren't the same size. The difference is most likely due to normal growth variations that are genetically driven.
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It is quite common for one breast to be bigger than the other as development occurs during puberty. Usually the breasts become the same size over time and do not need any treatment. However, if the breasts have not become more or less an equal size by the age of about 16 years old or near the end of puberty , they will probably remain unequal. About one in four adult women have some degree of asymmetry of the breasts. In some adolescents the problem is that one breast is overdeveloped, whereas in others the smaller breast is underdeveloped.
Ditch the pink this October and spread breast-cancer awareness with these 31 facts about breasts. In most women, the left breast is usually slightly larger than the right. Very few women have perfectly symmetrical breasts.
A common abnormality seen on mammogram results is breast asymmetry. Breast asymmetry is usually no cause for concern. Breast asymmetry occurs when one breast has a different size, volume, position, or form from the other.