The pain on the right side of the abdomen in one month of pregnancy may be a physiological phenomenon, but it may also be caused by ectopic pregnancy, pre-eclampsia and other factors, the pregnant woman needs to determine the cause according to the signs and examination results, and actively deal with it. 1, physiological phenomenon: during pregnancy, the pregnant woman’s uterus gradually increases in size with the growth and development of the embryo, and the ligaments that fix the uterus may form a pull and produce pulling pain, or squeeze to the right tissue and organs in the pelvis. Right-sided abdominal pain occurs. This pain usually lasts for a short time and can often be relieved by resting or changing the position without special treatment. 2. ectopic pregnancy: In ectopic pregnancy, when the embryo lays in the right fallopian tube, the right side of the abdomen usually has a not very obvious swelling pain or hidden pain, and when the gestational sac grows to a certain extent and ruptures, it will show a tearing pain in the lower abdomen on the affected side, accompanied by vaginal bleeding. Pregnant women should immediately go to the hospital, ultrasound examination, to understand the specific embryo bed site, as soon as possible to terminate the pregnancy; 3, pre-eclampsia: pre-eclampsia, pregnant women will have a slight abdominal pain, sometimes only the right side of the small abdominal pain, often accompanied by a feeling of falling, vaginal bleeding, etc., at this time can be taken under the doctor’s advice to preserve the fetus treatment, after the failure of the fetus need to perform a cleanup; 4, other: some abdominal Other diseases of the right side can also cause pain in the right side of the abdomen, such as right ovarian cyst, right fallopian tube lesion, right intestinal lesion, etc., which will usually show the corresponding signs.