Lower left lower abdominal pain can do ultrasound, CT, blood routine, urine routine and other tests. The left lower abdomen is usually the location of the sigmoid colon and descending colon, so the left lower abdomen pain may be caused by colitis, intestinal obstruction, and so on, and may also be the pain caused by urinary stones. In addition, if it is a woman, it may also be caused by gynecological diseases such as left-sided adnexitis and pelvic inflammatory disease. Therefore, patients can undergo abdominal ultrasound and abdominal CT to determine whether it is gastrointestinal diseases such as colitis, intestinal obstruction, etc., as well as whether there are stones in the urinary system. Women can also undergo gynecological ultrasound to determine whether they have gynecological diseases such as adnexitis and pelvic inflammatory disease. The results of the examination, combined with routine blood and urine tests, as well as the patient’s clinical manifestations, can be used to make a comprehensive judgment, and the disease can generally be diagnosed.