The contraction pains 5 days after delivery are mainly caused by the uterine regeneration, and most of the corresponding process lasts for about 10 days, during which the uterine contractions will be accompanied by pain. During pregnancy the uterus itself is significantly enlarged, and after delivery the uterus returns from the enlarged condition to the normal level which is called uterine regeneration, and the corresponding process will be accompanied by uterine contractions, which will cause the symptoms of contraction pains. The whole process takes about 10 days, and it is normal for the uterus to remain in this condition for 5 days after delivery. During the postpartum recovery period, you should pay attention to closely observe the condition of the uterus and the bleeding situation, and if you find that the uterus is not recovering well, you need to consult a doctor for observation in a timely manner, and after diagnosing the specific physical condition, you should carry out standardized treatment under the guidance of the clinician, so as to avoid delaying the condition.