Pregnancy breast swelling and pain may be due to normal physiological factors, but may also be caused by abnormal pathological factors, such as mammary gland hyperplasia, it is recommended to seek medical advice for further diagnosis and reasonable intervention or treatment. 1, physiological factors: after pregnancy, the body will release a large amount of estrogen and progesterone, under the action of estrogen and progesterone, the mammary gland ducts and alveoli will experience certain growth and development, resulting in Breast swelling, tingling or areola enlargement, nipple blackening, this situation is a normal physiological reaction. In addition, if pregnant women do not change their underwear on time, which is loose and comfortable, it will affect the blood circulation of the breasts, which will also easily lead to breast swelling and pain. Therefore, you should wear more comfortable underwear during pregnancy and pay attention to the hygiene of your breasts. Physical methods such as hot compresses and massage can be used to relieve the symptoms of breast swelling and pain, but attention should be paid to gentle movements to avoid damaging the nipples; 2. Pathological factors: If breast swelling and pain are accompanied by nodules or hard lumps that can be touched when massaging the breasts, breast swelling and pain caused by breast enlargement should be considered. This situation should be promptly visited to the hospital to confirm the diagnosis through breast ultrasound examination. If you are diagnosed with breast enlargement, you do not need treatment for the time being if you have mild symptoms. Because most of the drugs used to treat breast enlargement have the effect of activating blood circulation and removing blood stasis, and the use of drugs that activate blood circulation and remove blood stasis during pregnancy can easily lead to miscarriage or premature birth, so if it is not serious, it can be left untreated for the time being and treated after the birth of the baby. If the breast enlargement is more serious, you need to go to the obstetrics department of the hospital in time for further examination and then the specialist will choose medication or other treatment.