The pain and swelling of the breasts and the increase in leucorrhea are related to many factors: 1. It is considered to be a symptom before the onset of menstruation, many women will experience drastic hormonal changes in their bodies before the onset of menstruation, thus stimulating their bodies, resulting in various symptoms such as swelling of the breasts and increased leucorrhea, which are normal physical changes and can be avoided. 2. The main reason for this is the hormonal changes in the body. 3. It may also be caused by mastitis or other gynecological diseases, when there is an inflammation of the mammary gland, there will be stimulation and breast swelling and pain. When the symptoms appear, it is recommended to observe the body first, if a few days after the relief can not worry, there is an abnormal problem is best to seek medical attention.