If the pregnant woman is young, within 25 years of age, and the spinal epiphysis, the latest to close in the body, has not yet completely closed, the growth is an inevitable trend and does not have any relationship with pregnancy. If you are older than 25 years old, your height has not grown for many years, and all the epiphyses of your body have closed long ago, the height growth that occurs after a pregnant woman becomes pregnant is an illusion. The main reason is due to the fetus in the pelvis and abdomen. As the fetus continues to develop and grow, it takes up more and more space in the pelvis and abdomen of the pregnant woman, causing the pressure in the pelvis and abdomen to rise significantly. The human lumbar spine, itself is a curvature of the whole, the middle of the lumbar spine to the abdominal cavity, curved convexity. After pregnancy, the pressure in the abdominal cavity rises, causing the lumbar vertebrae of pregnant women to gradually straighten, the ligaments around the lumbar vertebrae are stretched, so that the overall height has grown, this reason, is also the main reason why pregnant women are prone to lumbar spine disease.