Easy pregnancy is the ovulation period, ovulation coitus the next day nipple pain is mainly related to the hormone level changes in the body during the ovulation period, and sex has little to do with. Women in the ovulation period due to the body’s estrogen and progesterone levels will change, sex hormone changes stimulation will lead to breast blood vessel expansion, congestion and breast tissue gap edema, resulting in breast swelling and nipple enlargement, and increased sensitivity, easy to touch the pain phenomenon, is a normal physiological phenomenon. However, if the nipples are often painful during the non-ovulatory period, or have broken, ulcerated, abnormal secretions and other manifestations, you should go to the hospital in time to avoid delaying the condition.