According to the nature, time, degree of pain and accompanying symptoms, it can be broadly classified into the following categories: First, women with small abdominal pain, consider chronic inflammation of the pelvis, mainly inflammation of the uterus, fallopian tubes ovaries caused by the pain of the lower abdomen, its accompanying symptoms are abnormal vaginal discharge, increased leucorrhea, etc.. It is recommended to check the abdominal ultrasound and urine examination in time. If you happen to be in pregnancy, you may experience such pain in the lower abdomen, which is caused by the gradual increase in the size of the uterus, as well as dysmenorrhea, and you may have lower abdominal distension and pain before your menstruation. The second, for male patients with obvious falling sensation and pain in the abdomen, mainly consider urinary stones, stone displacement to stimulate infection, and prostate enlargement will have obvious poor urination, incomplete urination, urinary urgency, urinary frequency, urinary waiting, etc., laboratory tests can be found in the urinary routine has a significant increase in white blood cells. Third, office workers with hemorrhoids after sitting for a long time will affect the function of defecation, causing local pain, which then causes pain with a downward sensation in the small abdomen. Fourth, there may be acute abdominal abdomen, such as acute gastroenteritis, in addition to pain in the abdomen will be accompanied by diarrhea or atypical ectopic appendicitis, acute pancreatitis, etc., will make the lower abdomen with a sense of pain, it is recommended that the blood routine, gynecological ultrasound, male patients check the abdominal CT.