Whether regular contractions in late pregnancy are imminent or not is determined by the intensity and duration of the contractions. Regular abdominal pain alone, but the intensity of contractions does not reach the level of causing the cervical canal to shorten and the opening of the uterus to widen, are ineffective contractions. Effective contractions are regular and gradually increasing uterine contractions lasting 30 seconds or more, with an interval of 5-6 minutes, accompanied by progressive loss of the cervical canal, dilatation of the uterine orifice and descent of the fetal previa. In addition, each pregnant woman has a different sensitivity to pain. Some pregnant women experience false contractions in late pregnancy, but these contractions do not cause the opening of the uterus, and the tension and anxiety felt by the pregnant woman may affect the progress of labor.