Mammary gland hyperplasia can lead to nipple overflow. Nipple overflow due to mammary gland hyperplasia has the following characteristics: 1. The overflow is small, and the amount of nipple overflow will not be large. 2. Multi-porous overflow, where overflow occurs from multiple breast holes rather than a single breast hole. 3. The nature of nipple overflow is usually plasma, mucus or milk-like, and no bloody overflow will occur. If nipple overflow occurs in breast enlargement, it is recommended to go to a regular hospital for breast ultrasound, mammogram or breast ductoscopy if necessary. If all of the above tests are consistent with nipple overflow due to breast enlargement, it is recommended to review the mammogram regularly and to take oral medication if necessary.