The main consideration for pain in the stomach falling downward is small abdominal cramps. The causes of abdominal cramps mainly include dysmenorrhea, pelvic inflammatory disease, acute appendicitis and so on. 1. Dysmenorrhea: women with irregular menstruation may experience dysmenorrhea during menstruation with lower abdominal cramps and generalized discomfort, which can be relieved after menstruation is over. 2. Pelvic inflammatory disease: unclean hygiene, lower genital tract infection, after hysteroscopic surgery, etc. may induce pelvic inflammatory disease, lower abdominal pain, lumbar pain, menstrual irregularities and other symptoms. 3. Acute appendicitis: Acute appendicitis is typically characterized by metastatic right lower abdominal pain, i.e., initially manifested as epigastric pain, and then transferred to the right lower abdominal pain. Abdominal pain may also be related to other causes, it is recommended to go to the hospital in a timely manner to improve the examination, under the guidance of the doctor to clarify the cause of the disease, to give targeted treatment or treatment.