Bleeding during pregnancy without pain in the abdomen may be due to placenta previa, preeclampsia, embryonic abruption, ectopic pregnancy, cervical pathology and other causes. 1. Placenta previa: When the placenta is positioned lower than the prenatal exposure, attached to the lower part of the uterus, and the lower edge of the placenta reaches or covers the inner opening of the cervix, it is called placenta previa. Symptoms of placenta previa are unprovoked, painless vaginal bleeding. If placenta praevia is suspected, ultrasonography should be performed to determine the type of placenta praevia. 2. Pre-eclampsia: Bleeding in pregnancy is often considered to be pre-eclampsia caused by progesterone deficiency, which requires oral or intramuscular progesterone under the guidance of a doctor’s prescription to protect the fetus. 3. Embryonic arrest: bleeding in early pregnancy may also be caused by fetal arrest, it is recommended to do an ultrasound and blood test to check the progesterone and blood HCG. 4. Ectopic pregnancy: Ectopic pregnancy will have vaginal bleeding in early pregnancy, but if the gestational sac ruptures, severe abdominal pain will occur, do an ultrasound and posterior fornix puncture can determine the ectopic pregnancy, and determine the positive surgical treatment. 5. Cervical lesions: cervical lesions in early pregnancy can also cause bleeding, to rule out abnormal embryonic conditions, you can do a gynecological examination to determine whether the cervix is normal. If painless vaginal bleeding occurs during pregnancy, you should be vigilant and go to the hospital in a timely manner to determine the cause of the problem and follow the doctor’s instructions for treatment.