In the first trimester of pregnancy, the placenta and fetus are relatively fragile and prone to problems. Due to the secretion of progesterone hormones, the mother-to-be’s body, especially the reproductive system, also undergoes tremendous changes, and early pregnancy for the fetus and pregnant women are prone to such and such problems. Vaginal bleeding is one of the common symptoms. The common causes of vaginal bleeding in early pregnancy are as follows: 1, miscarriage: is the most common cause, the bottom of the meconium hemorrhage, separation of the placenta and uterine wall, stimulate uterine contraction, cervical dilatation, blood flow, mostly accompanied by lower abdominal pain. 2, ectopic pregnancy: fertilized egg embryo implanted in parts other than the uterus, the most common with tubal pregnancy, the embryo continues to grow, resulting in tubal rupture and bleeding. At this time, the life of the pregnant woman is at risk, it is recommended to consult a doctor in a timely manner. 3, the cause of the uterus: uterine polyps, fibroids and cervical infection and congestion and other factors can lead to bleeding symptoms. 4, infection: any infection of the uterus and vagina may lead to bleeding. 5.Fetal factors: gravid abortion usually begins in the 2nd-3rd month of pregnancy, and the bleeding is mostly intermittent and small amount of bleeding. Abdominal pain may be mild or severe. 6, external forces: lifting heavy objects, sexual intercourse, constipation and other reasons can also lead to bleeding Vaginal bleeding in early pregnancy, be vigilant, but do not panic, carefully observe the vaginal discharge, it is best to use a cell phone to take pictures or keep them to the doctor, and then seek medical treatment in time to make the appropriate examination and treatment.