The contraction pains are mainly concentrated in the middle of the lower abdomen, which is the location of the “little belly”, corresponding to the position of the uterus. As time goes by, the pain of contractions gradually expands and becomes more pronounced. Some pregnant women may experience pain in the lumbosacral region due to the pulling of the uterus. It is important to distinguish between pseudo contractions and true contractions during late pregnancy. In the case of pseudo contractions, they can cause a feeling of tightness and hardness of the skin of the abdomen of the pregnant woman, which can occur 1-2 times a day and are irregular, but are usually not accompanied by pain and are normal. True contractions usually occur after the fetus is full term, with regular contractions, gradually shortening intervals and increasing pain intensity, usually manifesting as cramping or soreness in the lower abdomen. Some pregnant women may experience back pain due to the uterus pulling on the surrounding ligaments, especially in the posterior position of the uterus. If a pregnant woman has any of the above signs of true contractions, she should go to the hospital in time to prepare for labor, which usually starts within 24 hours.