Acute urinary retention is a symptom of sudden inability to urinate with a full and distended bladder. The clinical manifestations are painful symptoms such as fullness and distension of the lower abdomen, distress to urinate, inability to urinate, and tossing and turning. Diagnosis The diagnosis is based on the medical history, symptoms and signs of bladder distention, and urinary retention can be identified when urine cannot be passed or cannot be completely emptied. After urinary retention is detected by visual examination and percussion of the upper part of the pubic bone, etc., it is further confirmed by ultrasound examination and catheterization. Etiological diagnosis relies on asking about the history of surgery, history of trauma, urinary tract infection, urinary stones, urethral injury stricture, prostate lesions, central nervous system diseases and diabetes mellitus and other medical history and medication history, combined with symptoms and signs and ultrasound and other examinations to identify the cause of urinary retention. Examination Bladder ultrasonography: In clinical practice, it is widely used in the diagnosis of cardiology, gastroenterology, urology and obstetrics and gynecology diseases. Indications bladder tumors, bladder stones, bladder diverticula. Ultrasound examination of prostate, seminal vesicle gland, scrotum and penis: It is a routine examination method for male diseases and is suitable for the diagnosis of: 1. benign prostatic hyperplasia (“prostatic hypertrophy”), prostate cancer, prostatitis, prostate abscess, prostate cyst, prostate stone. 2. Inflammation of the seminal vesicle gland, seminal cyst, seminal vesicle gland tumor and congenital seminal gland agenesis.