I understand that women’s breast function in hormonal releases, and that the additional fatty tissue itself changes the way hormones are processed.
I would expect that breasts in young girls also influence hormonal releases and changes.
Men with breast cancer also have multiple hormonal issues that they have to deal with.
A surgeon said to me that a patient of his for other matters had lymphatic circulation problems and swelling after the surgery. Wore elastic bandages to compress under her arm. Sad.