The frequency of painful contractions needs to be decided according to the nature of contractions whether they are pseudo contractions or true contractions, and also depends on the causes of contractions.1. True contractions: True contractions before labor have a fixed time interval, usually 5-6 minutes of pain, lasting about 25-30 seconds, vaginal examination shows that the shortening of the cervical canal disappears, which means that the pregnant woman has entered the first stage of labor. As labor progresses, the pain interval becomes shorter and shorter, maybe 2-3 minutes, or even 1-2 minutes, with a duration of about 45-50 seconds. After true contractions appear, no matter what position the pregnant woman changes, the pain cannot be relieved. If you feel any abnormalities in the process of labor, you need to communicate with your doctor in time; 2. Pseudo contractions: the first time the pregnant woman has contractions may be pseudo contractions, and the pain is not regular at this time. A few weeks before delivery, the uterine muscles are more sensitive and irregular uterine contractions will occur, which are irregular, non-cyclical and weak, and may not produce pain, but only show tightness and hardness of the abdomen and a feeling of falling, and some pregnant women can even feel irregular contractions in the middle pregnancy. After the occurrence of pseudo contractions, pregnant women can choose to lie in bed and rest for a while, change positions appropriately, if the pain is obvious, you need to be admitted to the hospital for examination in time.