A vague pain in the bottom of the abdomen with a feeling of falling in 32 weeks of pregnancy may be caused by physiological reasons, premature labor and other reasons. 1. Physiological reasons: when the uterus and the fetus increase in the 32nd week of pregnancy, the ligaments around the uterus will be pulled and the pelvic floor tissues will be obviously compressed, and the symptom of vague pain in the lower abdomen with a falling sensation may appear after activities, and ultrasonography does not have the shortening of the cervical canal. 2. Preterm labor with preterm labor: there may be regular or irregular contractions, causing pain in the abdomen, accompanied by a small amount of vaginal bleeding, ultrasonography may suggest that the cervical canal is shortened with or without the combination of clinical manifestations and ultrasonography can assist in the diagnosis, and need to follow the doctor’s orders to give ritodrine hydrochloride and other medications to protect the fetus treatment. Pregnant women should rest in bed and avoid strenuous exercise. During pregnancy, pay attention to rest more, at the same time should relax, avoid nervousness, anxiety, any discomfort should be timely to the hospital, the doctor for a clear diagnosis, and cooperate with the doctor symptomatic treatment.