The absence of contraction intervals refers to the absence of contraction intervals in a pregnant woman at the due date. An important feature of labor mdash; mdash; regular uterine contractions that is contractions. Contractions: uterine contractions (i.e. contractions), which start irregularly and are weak in intensity, gradually become regular, stronger and stronger, with longer duration and shorter intervals, such as intervals of 2mdash;3 minutes, lasting 50mdash;60 seconds. By the due date, only contractions accompanied by pain are the harbinger of labor. So, what causes no interval between contractions in pregnant women? The following is a brief description of the causes of intermittent contractions: 1. Early water breakage. 2, incomplete cervical atresia. 3. History of preterm labor in the previous pregnancy. 4.Age over 35 years old. 5.Pregnant women smoke or drink alcohol. 6, trauma (such as abdominal impact or fall). 7.Incautious sexual life during pregnancy, causing infection. 8.Uterus abnormalities, such as bicornuate uterus, uterine fibroids, uterine myometriosis. 9.Uterus oversize, such as multiple pregnancy, gravida.