Patients with vague pain in the left side below the navel consider the following aspects: 1, consider patients with colitis, the left lower abdomen usually refers to the sigmoid colon, descending colon, ulcerative colitis or Crohn’s disease usually occurs in this section. 2, consider colonic tumors, the sigmoid colon is a common site for tumors, when vague pain should be ruled out for this reason. 3, consider patients with intestinal obstruction, there is mechanical The main manifestations of patients are abdominal pain, vomiting, and stopping defecation and gas evacuation.4. Consider intestinal perforation, which is mainly caused by inflammation and ulceration.5. Consider patients with intestinal adhesion, etc. Consider female patients with gynecological diseases, such as ovarian pathology.6. Consider female patients with gynecological diseases, such as ovarian pathology.