Patients with urinary tract infections may have left-sided abdominal pain, commonly caused by left-sided urinary tract infections, such as left-sided pyelonephritis, left-sided ureteral inflammation or inflammation of the left wall of the bladder, which may cause left-sided abdominal pain, but usually combined with abnormal sensations of urination, such as combined with frequent urination, urgent urination, painful urination or incomplete urination, some patients may not only have abdominal pain, but also may be accompanied by symptoms of low back pain, and need to undergo Urinalysis is needed to further rule out. If the pain on the left side of the abdomen is not accompanied by abnormal urination, it may be caused by other diseases, such as ureteral stones on the left side or colitis on the left side, and further imaging tests, such as ultrasound or CT examination of the urinary system or stool routine and colonoscopy, should be selected according to the patient’s specific physical examination. Patients are advised to go to the hospital for relevant laboratory tests to determine whether the left abdominal pain is caused by urinary tract infection.