Why Unequal Breast Size?

Breast asymmetry is very common and affects more than half of all women. There are a number of reasons why a woman's breasts can change in size or volume, including trauma, puberty, and hormonal changes. Your breast tissue can change when you're ovulating, and can often feel more full and sensitive.

Is it normal to have unequal breast size?

It is quite common for breast size to be unequal during puberty. If they are different sizes near the end of puberty, they are likely to stay unequal. There is no medical need for treatment for unequal breast size. Unequal breasts won't affect breastfeeding or increase breast cancer risk.

Should I worry if one breast is bigger than the other?

Most people naturally have one breast bigger than the other and this is normal. Changes to look for: a new lump or thickening in your breast or armpit. a change in size, shape or feel of your breast.