There are three main possibilities for breast pain: first, cystic hyperplasia, mostly seen in women of childbearing age between 30 and 50 years old, manifesting as bilateral breast swelling and pain with nodule formation of breast hyperplasia, and the pain is aggravated before menstruation and can be relieved after menstruation. Second, acute mastitis, which occurs in lactating women, often combined with milk stagnation, has paroxysmal pain in the breast at the beginning of the infection, mainly stabbing pain, and when the infection expands, severe pain in the breast may occur. Thirdly, breast cancer usually has no characteristic clinical manifestations in the early stage, but when the disease progresses to the advanced stage, paroxysmal dull pain in the breast may appear, and combined with wasting systemic reaction. When breast pain occurs, you should consult a doctor to clarify the cause and carry out reasonable treatment under the guidance of a specialist, avoiding blind medication to avoid serious complications.