Brown discharge at 33 weeks of pregnancy can increase the risk of preterm labor, intrauterine infection and fetal distress. When there is brown vaginal discharge at 33 weeks of pregnancy, it may be caused by preterm labor, cervical inflammation, placenta praevia or placenta previa, etc. It has a greater impact on the baby, and can increase the risk of preterm labor, fetal distress, intrauterine infections, etc. It is necessary to go to the hospital in a timely manner for ultrasound, gynecological examination, and fetal heart rate monitoring to assist in the diagnosis. In late pregnancy, it is necessary to strengthen the management of pregnancy, on-time obstetric examination, and strictly self-counting fetal movement to self-evaluate the intrauterine condition of the fetus. When there are abnormalities such as abdominal pain and brown vaginal discharge, it is necessary to promptly identify the cause under the guidance of the doctor and actively treat the cause, and if necessary, terminate the pregnancy at the right time to ensure the safety of mother and baby. When there is a brown discharge at 33 weeks of pregnancy you need to go to the hospital in time in order to identify the cause as soon as possible and actively deal with it.