If breast pain has already occurred, it is still necessary to actively treat the symptoms. Normally, if the milk cannot be completely extracted after stimulation, it is possible that a blockage in the milk ducts may be occurring. It is generally recommended to apply local heat and massage to the breasts before pumping. These treatments can effectively promote local blood circulation and help the milk ducts to clear, facilitating the complete extraction of milk. If there is continuous non-discharge of milk causing local breast swelling, it's necessary to consider the possibility of mastitis and seek medical advice promptly to receive appropriate treatment.