Breast fibroadenoma without surgery may maintain its status quo ante, increase in size, or become malignant. 1. Maintain status quo ante: Some breast fibroadenomas, may not have obvious changes, especially those that appear after the end of breastfeeding period, and do not increase in size significantly. 2. Enlargement: A small proportion of breast fibroadenomas may increase in size, especially during pregnancy, which is related to the change of estrogen and progesterone levels in the body. 3. Malignant transformation: complicated breast fibroadenoma has certain risk of malignant transformation, but the probability is relatively low. Most of the breast fibroadenomas can be followed up regularly. It is recommended that breast fibroadenoma patients go to regular hospitals in time and listen to the advice of professional doctors.