The vague pain in the abdomen that sometimes occurs during the first month of pregnancy may be due to physiological abdominal pain, cold, nervousness and other factors, and is generally normal. However, if it is accompanied by vaginal bleeding, it is common to ectopic pregnancy and pre-eclampsia, which need timely medical treatment. 1. pregnancy-related abdominal pain: there is no vaginal bleeding, simply occasional abdominal vague pain, which may be caused by the enlargement of the uterus, skin tightness, causing abdominal pulling pain, which is a normal reaction; 2. external stimulation: early pregnancy pregnant women due to cold stimulation, mental stress leading to gastrointestinal dysfunction or spasm. The abdominal pain may be vague, you need to pay attention to keep warm, you can also listen to music, chat to relieve stress, so as to reduce the symptoms of abdominal pain; 3, ectopic pregnancy: if the pregnant woman is accompanied by vaginal bleeding or abdominal pain aggravated, go to the hospital for relevant human chorionic gonadotropin examination and uterine adnexal ultrasound examination in time, if you do not observe the gestational sac in the uterine cavity, be alert to the occurrence of ectopic pregnancy; 4, pre-eclampsia. Pregnant women with vague abdominal pain with a feeling of falling and vaginal bleeding are considered more likely to have preterm abortion, which should also be judged by combining progesterone and HCG values. If it is preterm miscarriage, you can follow the doctor’s prescription for fetal preservation treatment. It is important to take care of rest, sleep and regular obstetric checkups. In addition, genitourinary system infection is also a common complication during pregnancy, which may cause vague stomach pain.