What is the cause of retrograde ejaculation?

Patient's question:

During ejaculation, it seems like there are clumps, it's thick, and it feels like there's a lack of power. Also, there's a sensation of semen flowing backward, which is very uncomfortable. About half a month.

Doctor's answer:

Hello, it is likely retrograde ejaculation. Retrograde ejaculation refers to a condition where there is a normal penile erection, normal sexual intercourse process, reaching sexual climax, and having the act and sensation of ejaculation, but no semen is expelled from the urethra, instead it is retrogressed into the bladder. Since the semen does not enter the vagina, it can cause infertility. After retrograde ejaculation, a urine test may show sperm and fructose.

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