The pain in the right lower abdomen requires the following tests: blood tests, ultrasound, CT, colonoscopy and so on. If acute appendicitis occurs, the right lower abdomen will be painful, to improve the routine blood test and appendix ultrasound, sometimes need to improve the appendix CT examination. If the right adnexa has lesions, such as ectopic pregnancy, adnexal tumor, etc., which will cause pain in the right lower abdomen, and need to improve the adnexal ultrasound or CT examination. Ultrasound or CT can also rule out the presence of ureteral stones. If the right side of the colon has lesions, such as colon tumor, colon diverticulum, etc., the right lower abdomen will be painful, need to perform abdominal CT examination and colonoscopy. There are many diseases that can cause pain in the lower right abdomen, and it is necessary to combine clinical symptoms and physical examination before deciding what kind of examination to do.