Redness usually refers to a small amount of vaginal bleeding, or bleeding material. There are many reasons for redness in the sixth month of pregnancy, such as pre-eclampsia, cervical insufficiency, placenta abruptio, cervical lesions, etc. It is recommended that pregnant women go to the hospital for gynecological and ultrasound examinations to clarify the cause and treat the cause. The main causes of redness in six months of pregnancy are the following: 1. Pre-eclampsia: Redness in six months of pregnancy may be a sign of pre-eclampsia. The first symptom that appears is often vaginal bleeding, which is usually small, often dark red, or bloody leucorrhea, lasting up to 4-5 days to more than a week. Secondly, the pregnant woman may sometimes feel paroxysmal abdominal pain a few hours to a few weeks after the appearance of the bleeding. In this case, drugs should be used to suppress contractions and fetal preservation treatment under the guidance of a doctor. 2. Cervical insufficiency: Pregnant women with cervical insufficiency may experience dilatation of the uterine orifice at about six months as the fetus increases in size, thus causing vaginal bleeding and a feeling of lower abdominal cramping. When this happens, a clear diagnosis can be made through ultrasound examination and fetal preservation treatment can be carried out under the guidance of a doctor. 3. placental abruption: after six months of pregnancy, there is a risk of placental abruption, mostly manifested as persistent abdominal pain with bleeding, the bleeding is mostly bright red and can be the same as the amount of menstruation, and pregnant women whose water has broken can show bloody amniotic fluid and poor uterine relaxation. Placental abruption is an emergency situation, and there is always a risk of acute fetal distress and fetal death in the uterus, so you need to consult a doctor immediately. 4. cervical lesions: pregnant women with cervical polyps, cervicitis and other diseases may have a small amount of vaginal bleeding in about six months of pregnancy, so you can have a gynecological examination and routine examination of the white belt to make a clear diagnosis and treat the symptoms.