Mid-menstrual period may refer to the middle of two periods, or it may refer to the period of menstruation. The symptoms of breasts change differently in each period, and need to be analyzed specifically. 1. Mid-two-period menstruation: This is usually the period of ovulation, when hormone levels in the body change, which may stimulate the breasts and show some subtle changes. Some women may have symptoms such as breast sensitivity and enlargement, while most women have insignificant changes. 2. During menstruation: Before the onset of menstruation, women’s breasts may show symptoms such as enlargement, breast sensitivity, pain, tingling, etc. With the onset of menstruation, the hormone level tends to stabilize. Symptoms such as breast sensitivity and tingling will gradually return and may only manifest as mild pain. If a woman experiences abnormal breast pain, it is best to consult a doctor for a systematic examination and diagnosis.