Bilateral renal distension is the most common in daily urological consultations, and the main causes are as follows:1. Urine cannot be excreted normally, leading to accumulation in the renal pelvis and renal calyces, resulting in the formation of bilateral hydronephrosis and bilateral renal distension, which is caused by congenital pelvic ureteral stenosis combined with infections, neurogenic bladder, prostatic hyperplasia, and urinary and ureteral stones.2. Congenital giant polycystic kidneys, which cause the renal peritoneum to be strained and appear as bilateral renal distension.3. Multiple or huge kidney stones cause bilateral renal distension.4, infectious diseases, pyelonephritis and chronic prostatitis will appear bilateral renal distension discomfort.5, gynecological diseases, uterine fibroids, chronic pelvic inflammatory disease will also appear bilateral renal distension.6, glomerular diseases, especially acute nephritis, bilateral renal distension will also appear.7, lumbar spine disease, lumbar muscle strain and lumbar spine osteophytes, will also appear bilateral renal distension.