Although women will experience chest pain after pregnancy, but chest pain is not a characteristic expression of pregnancy and cannot be determined purely on the basis of chest pain. The main causes of breast pain in women are as follows: 1. In about 40 days of pregnancy, the placenta and villi secrete a lot of estrogen, progesterone and prolactin, causing breast enlargement and breast enlargement, resulting in chest pain. This is a normal reaction to pregnancy and there is no need to worry excessively. If a woman has breast swelling and pain along with delayed menstruation, there is a higher possibility of pregnancy; 2. Many women have symptoms such as breast swelling, hardness and pressure pain before their menstruation, which are also normal and can be relieved by themselves without treatment; 3. Some women will have breast swelling or nipple pain during ovulation, and the breast performance may continue until the next menstruation; 4. For those who have a disharmonious sexual life or are sexually indifferent, breast engorgement and enlargement will not easily subside or subside incompletely due to failure to achieve sexual satisfaction, and persistent engorgement will make the breasts swollen and painful. In addition, during sex if the action is too large or too rough, causing breast damage, will also cause chest pain; 5, chest pain may also be caused by breast diseases such as breast enlargement, breast cancer. In summary, chest pain does not mean that you are pregnant, it is recommended to actively investigate the cause.