There are two main reasons for breast tenderness and delayed menstruation. One is the possibility of being pregnant, not having a period when you should have one, and maintaining a normal couple relationship in your daily life, especially when your female friend’s body is in the ovulation period. It is very easy to get pregnant during ovulation, when there may be a delay in menstruation and breast tenderness at the same time. The other is caused by irregular menstruation. Normally, a woman’s menstruation will come on time, but due to emotional stress and changes in hormone levels in the body, a woman’s menstruation may be irregular. In this case, it is recommended that women go to a gynecologist or a Chinese gynecologist for adjustment.