Broken blood vessels can cause hematospermia, the medical term for blood in the semen. In most cases, doctors find no cause, but it is usually a sign of an infection. Recurrent blood in the semen, especially in men over the age of 40, is a rare symptom of prostate cancer occurring in less than ten percent of cases. Prostate surgery and prostate biopsies can also cause hematospermia for several weeks following the procedure.

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