If you have had sexual intercourse before, you should consider the possibility of pregnancy. After pregnancy, the hormone level in the female body increases, which may cause the breasts to become bigger and painful, which is a normal reaction to pregnancy and does not need to be treated. This is a normal reaction to pregnancy and does not require treatment. If pregnancy is ruled out, breast hyperplasia should be considered, and a breast ultrasound can be performed. If the patient has a large breast lump, breast ultrasound should be performed in addition to a pathologic examination to determine whether malignant changes are present. Breast hyperplasia is mainly related to endocrine dysfunction, if the patient long-term mental stress, overwork or often take contraceptives, it is easy to cause endocrine disorders caused by breast hyperplasia. Usually pay attention to local hygiene, avoid bacterial infection, eat as light as possible, if it is simple mammary hyperplasia, you can carry out local hot compresses, which can help to relieve the pain; if there is a malignant tumor, remember not to apply hot compresses, so as not to accelerate the spread of the tumor.