There are three common causes of uncomfortable stomach symptoms at night in early pregnancy: the first one is due to the increase of human chorionic gonadotropin level and progesterone hormone in the body in early pregnancy, which will lead to endometrial tubo-ovarian edema and will cause uncomfortable stomach symptoms; the second one is due to the process of fertilized egg implantation in early pregnancy, which will cause a small amount of endometrial shedding, causing mild abdominal pain The second cause is due to the process of fertilization of the egg, which causes a small amount of endometrial shedding, causing slight abdominal pain, backache, and in some cases, a small amount of vaginal bleeding, manifested as brown vaginal discharge. The third cause should be considered whether there is gastrointestinal pathology or abnormal neurological regulation caused by psychological factors. If there is functional indigestion or inflammation of the gastrointestinal tract, it may cause gastrointestinal symptoms such as loss of appetite, nausea, vomiting or diarrhea.