Abdominal pain in early pregnancy may be caused by normal pregnancy reaction, preeclampsia, ectopic pregnancy and other reasons. 1. Normal pregnancy reaction: some women may experience uterine pulling pain in early pregnancy, which is a normal pregnancy reaction and does not require special treatment. 2. Pre-eclampsia: due to chromosomal abnormalities in the embryo, serious infections in pregnant women and other causes of early pregnancy symptoms of miscarriage, pregnancy from the uterine wall, stimulation caused by uterine contractions, resulting in lower abdominal cramps, small amount of vaginal bleeding and other symptoms. 3. Ectopic pregnancy: most ectopic pregnancies are tubal pregnancies. Pregnancy in the fallopian tube in the enlargement, caused by tubal expansion, resulting in pregnant women on one side of the lower abdominal pain; fallopian tube pregnancy abortion early, a small amount of bleeding, stimulation of the peritoneum, causing abdominal pain. Early pregnancy abdominal pain in time to consult the doctor, under the guidance of the doctor to identify the causes, give appropriate treatment.