For the breast has a flow feeling, if it is the pre-menstrual period, may be due to abnormal estrogen levels, hormone secretion imbalance in the body and lead to breast hyperplasia, if accompanied by swelling and pain as well as feel a lump, it is recommended to go to the hospital to do breast ultrasound to determine the situation. Lobular hyperplasia is also caused by abnormal hormone secretion in the body. If breast lumps are produced, it is recommended to go to the hospital for further examination, and the symptoms can be alleviated by taking oral medication at the initial stage. It may also be related to the expansion of the milk ducts, which may be due to bacterial infection or the accumulation of secretions in the ducts, and the abnormal secretion of hormones is also very possible, the specific circumstances need to go to the hospital for further examination.