There are more reasons for abdominal pain in the first month of pregnancy, which may be physiological abdominal pain occasionally, or abdominal pain caused by pregnancy-related diseases, and of course, problems of digestive system and urinary system cannot be excluded. I. Physiological abdominal pain: If the abdominal pain is mild, with occasional vague abdominal pain, without vaginal bleeding and other abnormalities, it may be related to the gradual enlargement of the embryo on the endometrium, which may pull the surrounding tissues and is a normal physiological reaction, usually without special treatment. Pathological abdominal pain: 1. Pre-eclampsia: if the abdominal pain is accompanied by vaginal redness, it may be due to pre-eclampsia, and it is necessary to take reasonable drugs under the guidance of the doctor, carry out fetal preservation treatment, regularly review the ultrasound, observe the development of the fetus, the situation may need to terminate the pregnancy; 2. ectopic pregnancy: abdominal pain accompanied by a small amount of vaginal bleeding, or suddenly a lot of bleeding, or even possible hemorrhagic shock If the pregnancy is complicated by a small amount of vaginal bleeding, or sudden heavy bleeding, or even possible hemorrhagic shock, it is necessary to go to the hospital in time, under the guidance of the doctor to carry out surgical treatment and end the pregnancy in time; 3. gestational trophoblastic diseases: such as chylothorax and choriocarcinoma, which can lead to abdominal pain in early pregnancy; 4. pregnancy combined with uterine fibroids: it is necessary to review the ultrasound regularly during pregnancy to understand the changes of fibroids, and if the fibroids degenerate, antibiotic treatment is needed, and drugs to inhibit contractions can be given when contractions are obvious; 5. Pregnancy combined with ovarian tumor: need to clarify the nature of the tumor, listen to the doctor’s advice, timely surgery; 6, digestive system diseases: such as acute appendicitis during pregnancy, pregnancy combined with acute pancreatitis, pregnancy combined with intestinal obstruction, or acute gastroenteritis caused by unclean diet can appear abdominal pain, sometimes accompanied by diarrhea, elevated routine blood white blood cells, vaginal bleeding phenomenon, need to seek medical advice, follow medical advice to actively 7, urinary system diseases: such as urinary tract infection or stones, may appear abdominal pain, usually accompanied by painful urination, hematuria and other symptoms.