Yellowing of urine with back pain may be caused by lumbar diseases, urinary tract infections, urinary stones and other factors. 1. Lumbar diseases: for example, lumbar muscle strain, lumbar intervertebral disc herniation, etc., usually cause the symptom of lumbar pain, and if accompanied by low water intake and urine concentration, the symptom of yellowing of urine with lumbar pain will appear. 2. Urinary system infection: for example, pyelonephritis, due to the presence of infection, can lead to back pain and yellow urine, may also be accompanied by frequent urination, urinary urgency, urinary pain, nausea and vomiting, fever and other symptoms. 3. Urinary stones: Ureteral stones, for example, usually cause pain in the lower back and abdomen, yellow urine and other symptoms, may also be accompanied by hematuria, urinary frequency and other symptoms, and may even cause hydronephrosis. The yellowing of urine in the lower back pain is also seen in other causes, it is recommended to consult a doctor for examination, to clarify the specific cause of the disease, and timely treatment.