Our hospital has recently opened up ductoscopy, which is an additional test for patients with nipple overflow. Ductoscopy is the third tool in breast examination, which basically solves the problem of diagnosing the cause of nipple overflow and has good diagnostic value for the diagnosis of nipple overflow caused by a bulging lesion in the milk duct. It can also avoid over-treatment of benign lesions. It can also perform milk duct flushing for the treatment of milk duct dilatation and inflammation, etc.