If stomach pain occurs on the forty-second day of pregnancy, the most common symptom in clinical practice is caused by a preterm miscarriage. The symptoms of pre-eclampsia may be caused by the lack of progesterone in the body, trauma, intercourse, or due to uterine dysplasia, in order to cause pain in the lower abdomen. It is recommended that in addition to ultrasound examination to understand the current development of the embryo, a clinical blood test for blood HCG and progesterone is also required, and if necessary, treatment with antifetus is given. In addition, if indigestion and diarrhea are caused by improper diet, abdominal pain may also occur clinically. However, it is often accompanied by changes in stool, such as loose stools and increased frequency of stools. In clinical practice, it is recommended to go to the hospital as soon as possible to check the stool routine, and then give the appropriate treatment. In addition, if the stomach pain is also caused by ureteral stones, it is also recommended to do the corresponding examination to exclude the possibility of ureteral stones.