Fibroadenomas are benign tumours of the breast which are characterized by a mixture of stromal and epithelial tissue. Fibroadenomas originate from the milk producing glands to form a solid lump. Fibroadenomas are caused due to hormone imbalances and the symptoms are painless, firm, mobile lump in the breast of a woman. According to American Cancer Society, fibroadenomas are most common in young women in their 20s and 30s, although they can be found in women of any age. The growth of these tumours is faster during pregnancy, while menopause causes them to shrink. Fibroadenomas increase the risk of breast cancer by about one and a half times the risk of women with no Fibroadenomas. Removal of fibroadenomas, is the recommended treatment if they keep growing but sometimes these tumours stop growing or even shrink on their own, without any treatment. Fibroadenomas are more common in African-American women. Fibroadenomas are also called breast mice due to their high mobility in the breast.