The renal region is located in the back of the waist on both sides of the spine near the ribs, the exact medical location is, the lateral edge of the erector spinae muscle and the twelfth rib formed by the triangle area, this area of pain is called renal pain, in the clinical significance is relatively large. Kidney pain is usually caused by kidney diseases, such as kidney stones, acute pyelonephritis, hydronephrosis, acute nephritis or acute progressive nephritis. Urinalysis is positive for white blood cells, red blood cells, and urine protein. Ultrasound examination of the urinary tract will show kidney stones or hydronephrosis. In addition to kidney diseases that can cause pain in the kidney area, some lumbar muscle diseases can also cause pain in the kidney area, such as lumbar muscle strain. This kind of disease can’t be detected by urological ultrasound or routine urinalysis, but the pain will be aggravated when doing bending activities, which is a very big difference from the pain in the kidney area caused by urological diseases.