Lower left abdominal pain along with back pain may be caused by left kidney stone, left ureteral stone, etc. 1. Left kidney stone: it is caused by abnormal aggregation of crystalline material in the kidney, when the kidney stone is small or has not caused obstruction, it can be asymptomatic; when the kidney stone becomes bigger or causes obstruction, it can appear lumbar pain, back pain, or lower abdominal pain, back pain and other discomforts, often accompanied by hematuria, cloudy urine, difficulty in urination and other symptoms, which is manifested as left lower abdominal pain with lower back acidity. 2. Left ureteral stone: generally is a kidney stone in the process of discharge, in the ureteral stenosis obstruction caused by its main manifestations of waist or abdominal pain, hematuria, can be accompanied by nausea, vomiting, urinary frequency, urinary urgency, pain in urination and other symptoms, but also manifested in the left lower abdominal pain at the same time low back acidity. There are many other causes of left lower abdominal pain along with low back pain, which should be taken seriously, and timely consultation should be made to find out the cause of the disease and follow the medical advice for further treatment or therapy.