Placenta previa refers to the condition where, after 28 weeks of pregnancy, the placenta reaches or covers the internal opening of the cervix. There are multiple causes for placenta previa, and its occurrence does not necessarily lead to preterm birth. Clinically, placenta previa mainly results in irregular vaginal bleeding, which increases the risk of preterm birth. Therefore, it is recommended that regular prenatal visits be conducted at a hospital when placenta previa occurs. Treatment measures should be taken based on the specific condition of the placenta, and treatment to preserve the pregnancy may be necessary at times. In cases of placenta previa, it is advisable to rest in bed as much as possible and avoid strenuous activities.