Premature birth refers to delivery occurring between 28 and 36+6 weeks of pregnancy. The symptoms of premature birth primarily include the following aspects: First, regular uterine contractions occur. These contractions can lead to the descent of the fetal head and exert pressure on the cervix, which is necessary for the delivery of the fetus. It generally manifests as pain every three to five minutes, with each episode of pain lasting more than one minute, and both the frequency and intensity of the pain gradually increasing. Second, the appearance of "bloody show" occurs. As the fetus descends, it can cause the rupture of capillaries at the edge of the membranes, leading to bloody show. Third, there is a noticeable feeling of heaviness or pressure. Gynecological examinations can reveal dilation of the cervix and shortening of the cervical canal. When these symptoms appear, an assessment for premature birth should be conducted, and preparations for premature delivery should be made.