Breast ductal tumors, generally referred to as intraductal papillomas, are benign lesions with only a 4% chance of malignancy, and there is no exact node for the timing of their malignancy. Intraductal papillomas are most commonly seen in menstruating women aged 40-50 years old. 70% of patients have small tumors that occur near the large milk ducts, under the nipple and areola, and are mostly solitary, usually without obvious conscious symptoms, and are often noticed by nipple overflow staining the underwear. Once diagnosed, it can be treated by precise excision through segmental resection, subcutaneous mastectomy or mastectomy, etc. The prognosis is generally good and no cancer will occur. However, if it is left to develop without treatment and the patient’s physical quality is poor, it may become cancerous, especially the rate of terminal ductal papilloma is high, but the specific time to turn from benign tumor to malignant tumor varies from person to person, which may be months to years in a fast way or decades in a slow way. The onset of intraductal papilloma is relatively insidious, and it is difficult to be detected in normal times. It should be actively self-examined, and regular medical checkups should be conducted every year for early detection and treatment to reduce the chance of cancer.