Urine color dark brown back pain may be kidney stones, kidney tumor, acute pyelonephritis, renal tuberculosis and other causes. 1. Kidney stone: due to the stone’s damaging effect on the mucosa of the urinary tract, there may be hematuria which makes the urine brown in color, and it may also cause pain in the renal region accompanied by percussive pain in the angle of the cribriform ridge, or dull pain in the lower back after activity, which can be clearly diagnosed by combining with the clinical manifestations, ultrasound, X-ray examination, and so on. 2. Renal tumor: it mainly manifests as indirect painless hematuria, which makes the urine brown, accompanied by waist pain, abdominal mass, etc. Combined with medical history, clinical manifestations and ultrasonography, X-ray or CT examination, it can assist in diagnosis. 3. Renal tuberculosis: it can also cause hematuria and make the urine brown, when the lesion damage is serious and cause tuberculous pus kidney, it can cause back pain, accompanied by urinary frequency, urgency and urinary pain, pus urine and other symptoms, combined with the clinical manifestations and urinalysis, ultrasound, cystoscopy, etc, can assist in the diagnosis. 4. Acute pyelonephritis: it can be manifested as fever, lumbar pain, frequent urination, urgency, painful urination and hematuria, etc. It can be diagnosed by combining with typical clinical manifestations and urine examination. 5. Kidney trauma: due to tissue destruction can cause hematuria, can also cause concomitant side of the waist, abdominal pain, severe cases can cause shock, combined with the history and physical examination, urinalysis, ultrasound and so on can help diagnosis. Urine color dark brown waist pain may have other reasons, need to go to the hospital in time, active treatment.