If a woman has sore nipples, if the pain is mild and is an adolescent or pregnant woman, it is usually caused by a large amount of estrogen production and is normal. If the patient is wearing underwear that is too tight or too hard, resulting in long-term wear and tear on the nipples, the pain may occur. The nipples are cracked, causing pain. If not treated in a timely manner, it can also lead to infection, forming nippleitis; 3, breast hyperplasia: common in women of childbearing age, usually caused by the body estrogen, progesterone level disorders, and improper diet and other factors, can lead to the symptoms of nipple pain, may also be accompanied by extensive pain in the breast; 4, mastitis: patients with mastitis may also be manifested as nipple pain, in addition to It can be accompanied by overall breast swelling and pain, and may also have systemic symptoms, such as fever. Especially for breastfeeding women, mastitis is more likely to occur due to untimely emptying of milk, which affects breastfeeding; 5. As the condition deteriorates, symptoms such as nipple pain, breast lumps, abnormal breast skin, nipple overflow, etc. may appear.