Strictly speaking, there are no pseudo contractions. Irregular asymptomatic contractions during pregnancy are a normal phenomenon, and they may be more frequent in late pregnancy when labor is approaching, walking more often, and changes in position can induce such contractions, which are not regular and are uterine contractions, not pseudo contractions. These contractions will not lead to intrauterine hypoxia and will not affect the normal activities of the pregnant woman, and they are ineffective contractions that will not lead to preterm labor. However, once the contractions are regular and accompanied by a soreness and falling sensation in the back, appearing more than 4 times in 20 minutes or more than 8 times in 1 hour, which cannot be relieved for 2-3 hours, it may be a sign of labor and you should seek medical attention in time. The regular contractions with lumbar soreness and cramping sensation after true labor can promote the contraction of the cervix and dilatation of the uterine opening, which is the main driving force of labor. During contractions, the placental blood flow is reduced or temporarily blocked, and after the contractions disappear, the blood flow is restored, and the fetus has a certain tolerance and ability to compensate for this temporary lack of oxygen. However, if the contractions are too strong or too frequent, it will increase the possibility of intrauterine hypoxia. Medical personnel can understand whether the fetus has hypoxia during contractions through fetal heart monitoring graphics, and make timely and appropriate treatment to relieve the fetus of hypoxia.