The nerves governing the anus and urethra are derived from the pubic nerves, and the anal and urethral sphincters have extensive connections in the perineum, so it is easy to cause spasm of the bladder neck and urethral sphincter directly or indirectly through nerve reflexes after anal surgery, resulting in urinary difficulty or retention. The common causes of dyspareunia or urinary retention are: 1. Nerve function has not recovered after sacral or lumbar anesthesia. 2. 2. Severe pain in the anal area. 3.Injections or surgical irritation, especially after anterior anal rectal disorders such as anterior internal hemorrhoids treated with ligation or sclerotherapy injections. 4.Compression by intra-anal filling, such as placing more gauze or gauze in the anal canal at the end of surgery, or over-tightening the pressure bandage after surgery. 5, prostate disease, such as prostate hypertrophy or prostatitis patients original urine is very unclear. 6, mental and environmental factors, such as too much mental tension after surgery, not used to bed or in the ward to urinate, etc. In addition, more men than women have difficulty urinating or retaining urine, which may be related to the fact that the female urethra is shorter while the male urethra is longer and curved.