Can Estrogen Pills Increase Breast Size?

The hormone estrogen, if taken in high enough doses, increases breast size by stimulating growth of breast tissue.

What hormones make your breasts bigger?

Estrogen is also the hormone primarily responsible for the development of breasts during puberty. When a person starts taking the birth control pill, their levels of these hormones rise, and this can result in an increase in breast size.

What happens if a girl takes estrogen pills?

The risk factors and side effects associated with estrogen use include: Blood clots: Estrogen increases your risk of blood clots, which can cause stroke, heart attack, and even death. Cancer: Estrogen may increase your risk of certain cancers, specifically breast cancer.