Clinically, if the urine stored in the bladder is more than 300ml, accompanied by the patient’s inability to urinate by himself, indwelling catheterization is needed to drain the urine from the bladder to reduce the patient’s local pain and suffocating symptoms, and to reduce the pressure in the bladder to avoid the reflux of urine in the bladder to the kidneys and further occurrence of hydronephrosis and kidney damage, so clinically, patients with urinary retention are Therefore, catheterization should be performed for patients with urinary retention. If the urinary tract is completely obstructed and the ureter cannot be inserted, a cystostomy on the pubic bone is required to reduce the pressure in the bladder and improve the patient’s symptoms. There are numerous causes of urinary retention, which may be benign or malignant diseases. The most common cause is prostatic hyperplasia in men, which is mostly seen as tumors of the urethra or neurogenic bladder, etc. Relevant imaging tests are needed to further confirm the diagnosis, such as ultrasound of the urinary system or urethroscopy. After the cause is identified, the obstructing factor can be removed to restore urination to a normal state.