Fibroadenoma of the breast is a benign tumor that occurs in adolescent girls and is generally more common between the ages of 15-25. In general, breast fibroadenoma is best removed surgically. Among them, single breast fibroadenoma is easy to remove, and the smaller the tumor, the less damage to the breast. For multiple fibroadenomas, small fibroadenomas that cannot be reached by hand or can only be revealed by ultrasound are difficult to remove. Patients with fibroadenomas should be reviewed regularly at six-month intervals. Breast fibroadenomas that are located below the nipple and are more than 2 cm in diameter should be removed as early as possible, as adenomas in this location can themselves interfere with milk production. Whenever surgery is performed on the breast, it may damage the milk ducts and affect the secretion of milk, resulting in poor milk secretion, and milk stagnation may also lead to mastitis. Whether or not surgery is performed, the mother should insist on breastfeeding as long as mastitis has not yet occurred. If the lump gradually increases in size, it should be surgically removed as soon as possible. Breast tumor itself does not cause miscarriage, but the painful stimulation of having the tumor removed may cause uterine contraction and lead to miscarriage. Although mammary fibroadenoma is a benign tumor, there is a possibility of malignancy even if the disease lasts for 20-30 years. Young women who have had the disease for a short period of time usually do not become malignant in the near future. If the tumor does not increase in size, it can be removed after breastfeeding.