The disease is most common in women between 40 and 50 years of age, and 3/4 of the cases occur in the enlarged part of the large milk duct near the nipple. The tumor is small, tipped and with many villi, richly vascularized and with a thin, brittle wall that bleeds very easily. Symptoms: The clinical features are a bloody nipple discharge, usually bright red, and a less palpable mass. The diagnosis is mostly established if a lump of several millimeters in size, soft and pushable, is palpable in the areola area and can be discharged from the nipple with light pressure. The affected breast is usually painless. Occasionally, pain may occur due to the tumor blocking the milk ducts, and once the blood is discharged, the pain may disappear. Examination: Routine imaging examinations, such as breast ultrasound, mammography, etc. If a mass is found, imaging-guided hollow needle aspiration biopsy of the mass is feasible for histopathological diagnosis. Cytologic smear is feasible for overflow to clarify the presence or absence of malignant tumor cells. Breast ductoscopy is also acceptable. Treatment: It is usually believed that intraductal papilloma is benign, but malignancy can occur in 6% to 8% of cases, so early surgical treatment should be performed. The excised specimen should be sent for pathological examination, and if malignant changes are seen, it should be treated as breast cancer.