The main consideration is several common gastrointestinal pathologies, such as irritable bowel syndrome, especially constipated irritable bowel syndrome, which is characterized by pain in the lower left abdomen accompanied by changes in bowel habits or stool characteristics, such as unformed stools, dry stools, and globular shape, and the pain in the lower left abdomen is slightly relieved after smooth bowel movements. This disease tends to recur and has a long duration. There is also chronic colitis, which tends to be retained in the left sigmoid colon and stimulates inflammation of the intestinal mucosa, and the chronic inflammation of the colon can be significantly relieved after laxative bowel movement, and the diagnosis can be confirmed mainly by colonoscopy. Generally, the left lower abdomen intestinal mucosa is locally congested and reddened, and there may be mild small flakes of erosion. In addition, ischemic colitis is also prone to left lower abdominal pain because the most problematic part of the intestinal blood supply is the descending colon and sigmoid colon, the left lower abdominal area.