Smooth, tough, spherical masses in the breast are one of the characteristics of breast fibroids. It is a slow-growing, spherical or ovoid mass with smooth surface, firm texture, clear borders, and a sliding sensation when touched. It is common in young women aged 20 to 25 years old, mostly solitary, slow-growing, and may have no conscious symptoms, but often found unintentionally in spherical lumps in the breast. The diagnosis of mammary fibroids is as follows. 1. The disease is most common in adolescent women, most common at the age of 18 to 25. 2. The tumor mostly occurs in one breast, often solitary, and is more common in the outer upper quadrant of the breast. The lump is usually round or oval, with different sizes, hard texture, smooth surface, clear boundary, large mobility, no adhesion with surrounding tissues, no pain and tenderness. It grows slowly and does not septicize and ulcerate. It is not related to menstrual cycle. 3.Molybdenum X-ray and other imaging examinations can help the diagnosis. If necessary, needle aspiration cytology or biopsy of the mass may be performed to finalize the diagnosis. It should be noted that if a breast lump appears in a woman over 35 years old, especially after menopause, even if the lump looks very much like a breast fibroadenoma, the diagnosis should not be made lightly, and the diagnosis of fibroadenoma should be made after the possibility of breast cancer has been ruled out, and surgery should be preferred.