Hormones & Breasts: Hormones cause breast to grow big. These hormones can be the ones that are naturally made in the body or can be from sources outside of the body such as in birth control pills. Pregnancy causes breast to grow and when the baby is born, milk production from the breasts make the breasts get big.
Answered 10/4/2016
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Genetics, medication: Side effects - estrogen containing meds including contraceptive pills , some blood pressure meds like spironolactone, certain tumors that produce estrogen etc. Take care!
Answered 12/10/2013
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