The right lower abdomen is mainly the appendix, cecum and the end of the ileum. If there is pain in the right lower abdomen, we should look for appendicitis; if the patient is older, it may be a cecum tumor, and a colonoscopy should be done; at the same time, it may be an inflammation of the diverticulum at the end of the ileum. In the right lower abdomen, there are ureters and ureteral stones can also cause pain in the right lower abdomen; meanwhile, female patients should pay attention to identify whether there is inflammation of ovaries and fallopian tubes or ovarian cysts, torsion, ectopic pregnancy, etc. Ultrasound or CT should be done promptly to make a clear diagnosis of right lower abdominal pain.