Our expert says:
Dear Worried Man
blood in the semen is called hematospermia
Read this article: http://en.wikipedia.org/wiki/Hematospermia
It usually goes away by itself and is not dangerous, sometimes it can be due to an infection, and very rarely is it associated with cancer in the male genital tract.
Just keep an eye on it - if it keeps on happening ask your GP to refer you to an urologist for evaluation.
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