Left abdominal with lumbar pain is commonly due to the following reasons: First, lumbar trauma: especially lumbar vertebral fracture, can lead to localized bleeding, oozing, resulting in lumbar pain, and at the same time involving the left abdominal pain. Forward compression of the abdominal plexus can also lead to clinical symptoms of abdominal distension, abdominal pain, the patient can not have a normal bowel movement, and the shooting of X-rays can confirm the diagnosis. Second, serious urinary system diseases: such as urinary stones, ureteral stones, the above diseases will stimulate the ureteral nerve, causing severe pain in the lower back, can also involve the left side of the abdominal pain, the patient will experience severe abdominal cramps, urination will also induce pain symptoms worsen. In severe cases, it will cause hydronephrosis, affecting kidney function, and the location of the stone can be confirmed by ultrasound examination. Early diagnosis and early treatment can lead to rapid relief of the above clinical symptoms.