Sore nipples are not necessarily caused by ovulation, but may also be caused by breast hyperplasia or mastitis. 1. Ovulation: When a woman is in the ovulation period, due to changes in the levels of estrogen and progesterone in the body, it may cause nipple pain. This is a normal physiological phenomenon and does not require special treatment. After the ovulation period, the symptoms of nipple pain will gradually disappear. 2. Mammary hyperplasia: usually caused by endocrine hormone metabolism imbalance, due to the increase in estrogen levels, the formation of persistent stimulation of the mammary glands, which can cause nipple pain, may also be accompanied by breast lumps, nipple discharge and other symptoms. 3. Mastitis: usually caused by bacterial infection or milk stagnation, due to inflammation in the mammary glands, under the stimulation of inflammatory factors, it will cause nipple pain, and may be accompanied by breast swelling, fever and other symptoms. As you can see, nipple pain is not always caused by ovulation, but may also be related to other factors. It is recommended to consult a doctor in time to diagnose the cause clearly, and then give targeted treatment and adjustment.