Slight redness in the vagina at 28 weeks of pregnancy may be due to preeclampsia, placenta problems and gynecological diseases, which can be clarified according to the combination of symptoms and the corresponding examination. 1. Preeclampsia: Slight redness in the vagina at 28 weeks of pregnancy, pay attention to whether it is accompanied by abdominal pain and a feeling of hardness and tightness of the stomach, which may be the manifestation of preeclampsia, and suggest that pregnant women seek medical attention in time, and take appropriate treatments through gynecological examination, blood HCG and ultrasound examination. Appropriate treatment, generally bed rest, close observation of bleeding, the use of birth control drugs ritodrine hydrochloride tablets, can inhibit uterine contractions, relieve smooth muscle spasms, and try to avoid the development of difficult to avoid miscarriage; 2, placenta problems: such as placenta praevia, placenta previa, placenta previa, or placenta previa, belonging to the late pregnancy and a common complication of placenta praevia, placenta previa and placenta previa can occur painless vaginal bleeding, and placenta previa is often accompanied by abdominal pain. Placenta previa and placenta previa can cause painless vaginal bleeding, while placenta previa is often accompanied by abdominal pain. It is recommended to have an ultrasound in time to find out the condition of the placenta. Pregnant women with placenta praevia and placenta previa need absolute bed rest and treatment to stop bleeding and protect the fetus. Placenta previa is mild, and the placenta can grow well; if the placenta previa is serious, emergency surgery is needed to terminate the pregnancy; 3, gynecological diseases: for example, vaginitis, cervicitis, cervical polyps, and uterine fibroids, etc., which may lead to a small amount of vaginal bleeding, due to the fact that the pregnancy is a special period of time, can not be used on their own, it is recommended that pregnant women consult the Obstetrics and Gynecology Department, and according to the doctor’s advice to decide on a specific method of treatment.