If you are pregnant and your breasts are squeezed, you may experience bleeding caused by capillary expansion, bleeding caused by breast diseases such as mastitis or breast hyperplasia, or bleeding caused by tumors such as intraductal papillomas. 1. Breasts are squeezed and bleeding: during pregnancy, under the influence of progesterone, breasts may be obviously swollen and painful, and then if the breasts are excessively squeezed and traumatized, it may cause bleeding. It is recommended to wear loose clothing and not to squeeze the breasts too much. 2. Breast diseases: Mastitis or breast hyperplasia may cause bloody breast discharge. 3. Tumor: such as intraductal papilloma, with nipple discharge as the main symptom, which can be bloody or yellow-brown. There may be other reasons why blood can be squeezed out of the breast during pregnancy, and it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.