The ovulation day is 14 days before the next menstruation, and the ovulation period is about 10 days. During ovulation, the level of sex hormone in women's body changes. The estrogen level reaches its peak and acts on the breast, causing the expansion of breast blood vessels. In addition, women have emotional effects such as irritability during this period, which may cause breast pain, abdominal pain and other discomfort, which generally disappear after the end of the ovulation period. However, it does not exclude the impact of female breast diseases, such as breast hyperplasia. If breast pain continues unabated, it is recommended to further seek medical advice. If necessary, breast examination and breast ultrasound should be performed to exclude other diseases.