Exact cause of Fibroadenoma of Breast is unknown. Though common associated factors are-
- Hormones: Especially Estrogen seems to play a significant role in both growth and maintenance of these benign tumours.
- Oral Contraceptive pills (OCP): These are the medicines, basically female hormone combinations which prevents ovulation thereby prevents pregnancy. OCP can also cause Fibroadenoma of breast.
- HRT (Hormonal Replacement Therapy) given in some cases of menopause due to excessive menopausal symptoms can cause fibroadenoma of breast due to estrogen hormone.