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 expected date of delivery, only contractions accompanied by pain are the harbingers of labor. A few weeks before delivery, the uterine muscles are more sensitive and there will be irregular uterine contractions that last for a short time, are weak, or are limited to the lower part of the uterus. After a few hours, they stop and cannot open the cervix of the uterus, so they are not in labor and are called false contractions. The contractions of the uterus in labor are regular. At the beginning, the interval is about once every 10 minutes, and the pregnant woman feels abdominal pain, then the duration of the pain gradually lengthens to 40~60 seconds. The degree also increases and the interval time is shortened to about 3~5 minutes. When abdominal pain occurs with uterine contractions, the lower abdomen may feel very hard. So, what are the reasons for the occurrence of no contraction interval in pregnant women? The following is a brief introduction to the causes of intermittent contractions: 1, the uterus infection caused by abnormal, this disease is more serious, if not timely treatment is likely to cause premature birth and other lesions, it is recommended that timely hospital examination, so that the patient can also get the best treatment in a timely manner, but also so that family members do not worry. 2, infection outside the uterus, such as urinary tract infection, vaginitis. 3, placental abnormalities, such as placenta praevia,, early placental abruption. 4, uterine abnormalities, such as bicornuate uterus, uterine fibroids, uterine myometriosis. 5.Uterus oversize, such as multiple pregnancy, gravida.