The lower abdomen is divided into three regions according to the nine-point method, namely, the right lower abdomen, the middle lower abdomen and the left lower abdomen, which mainly contains digestive, urinary and reproductive organs. 1. Right lower abdomen: it includes appendix, cecum, ascending colon, ileum and right inguinal canal, right ovary, fallopian tube, right ureter and so on. 2. Middle and lower abdomen: it mainly includes ileum, lower ureter, part of bladder, uterus and sigmoid colon. 3. Left lower abdomen: mainly includes the descending colon, part of the ileum, the sigmoid colon and the left inguinal canal, the left ovary, the fallopian tube, the left ureter and so on. In addition, there will be arteries, veins and lymphatic tissues in the corresponding area, etc. In the corresponding area of the pain mass, need to consider the corresponding tissue and organ origin of the lesion, through the imaging and laboratory tests for comprehensive judgment, under the guidance of the clinician for standardized treatment.