Can taking birth control pills increase breast size?

Estrogen sensitivity: Yes, it is possible for your breasts to become significantly larger when taking oral contgraceptives. While part of this may be due to edema (fluid) other components of the breast such as the gland or fat may also contribute to the overall size increase and willbe a function of your specific sensitivity to estrogen, breast receptors, and the estrogen content of bcp.

It can: Some people report this side effect, but that should not be the reason for taking birth control pills.