The pain in the ribs of pregnant women may be due to the following reasons: 1, abdominal wall muscle pull, when the fetus grows rapidly, the amount of amniotic fluid in the body will also increase rapidly, the abdominal circumference grows rapidly, resulting in the muscles of the external abdominal wall being squeezed from the inside of the abdominal cavity. At this time, the muscles of the external abdominal wall attach to the rib cage at the point of attachment, producing a very strong pulling effect on the rib cage, which over time can cause pain in the rib cage. This condition is significantly aggravated when the patient walks with weight on the ground, or when he or she strains to defecate or cough. 2. The rib cage is squeezed, which is most common when the patient sits or stands for a long time and often bends over to pick up things. As the fetus itself and the amniotic fluid are the occupants of the abdominal cavity, this causes the ribs to be squeezed from above as well as below when the patient bends over, which will also cause pain over time.3. The venous pressure of the abdominal wall rises, the rapid growth of the fetus will compress the posterior inferior vena cava, and the increased pressure of the inferior vena cava will cause some blood to flow back to the heart from other pathways, such as through the veins of the abdominal wall, when the The increased venous pressure can lead to pain around the rib cage.