If the breast swelling and pain in early pregnancy is caused by hormonal changes in the body, it is a normal phenomenon. If breast swelling and pain is caused by mastitis, breast hyperplasia and other diseases in early pregnancy, it is not a normal phenomenon. In early pregnancy, the content of estrogen and progesterone in the body will increase, and pregnant women will experience breast swelling and pain, breast enlargement, nausea and vomiting, frequent urination, lethargy, fatigue and other early pregnancy reactions, which is a normal physiological phenomenon, and does not need to be treated. If a pregnant woman develops mastitis in early pregnancy, the patient will also have breast swelling and pain, breast lumps and other manifestations, which is not a normal phenomenon. In addition, if breast hyperplasia occurs in early pregnancy, the patient will also show breast swelling and pain, breast nodules, nipple overflow and so on. If breast hyperplasia causes breast swelling and pain in pregnant women, it is mostly considered to be an abnormal phenomenon. In addition, breast swelling and pain in early pregnancy may also be related to breast trauma, breast cancer and other diseases, which is also not a normal phenomenon. It is recommended that pregnant women with breast pain in early pregnancy should go to the hospital in time for examination and follow the doctor’s instructions after the cause of the breast pain is clarified.