Pregnancy 40 days stomach pain can be seen as a physical pain caused by pregnancy, but also due to other abnormal conditions. 1, physiological phenomenon: If it is clear that early intrauterine pregnancy, the lower abdominal pain at this time is mainly considered to be physical abdominal pain caused by pregnancy, which is a normal physiological phenomenon. It is often manifested as a short period of pain in the lower abdomen, which is aggravated by exertion and can be relieved after lying down and resting. 2. Pre-eclampsia or miscarriage: If early intrauterine pregnancy has been clearly identified and the pain is long and gradually increasing, or accompanied by a little vaginal bleeding, the possibility of pre-eclampsia or miscarriage cannot be ruled out, and it is necessary to immediately go to the hospital to recheck blood HCG and early pregnancy ultrasound for clear diagnosis. 3, ectopic pregnancy: If there is no clear intrauterine pregnancy, the vague pain in the lower abdomen at the early stage of pregnancy needs to be alerted to the possibility of ectopic pregnancy, which is often manifested as prolonged and persistent pain in one side of the lower abdomen, at which time immediate medical attention is needed, because ectopic pregnancy progresses rapidly and can cause syncope, hemorrhagic shock and even life-threatening when rupture occurs. 4, other diseases: if the pregnant woman has not been to the hospital, she can test positive urine test paper at home by herself, which does not exclude the possibility of false positives, and the hidden pain in the lower abdomen does not exclude gastroenteritis, pelvic inflammatory disease, appendicitis and other causes. To sum up, lower abdominal pain in 40 days of pregnancy can be seen as a normal physiological phenomenon, but it can also be seen as a result of pre-eclampsia, ectopic pregnancy or other diseases. If you experience lower abdominal pain in early pregnancy, you should go to the hospital in time to clarify the cause, do not wait at home to avoid ectopic pregnancy rupture hemorrhage, hemorrhagic shock, or even life-threatening.