Semen, blood in

[Merna]

Blood in semen (called hematospermia, because sperm are mixed with blood in the semen) can be a frightening symptom, but it is usually not a sign of a serious problem. Blood in semen is not usually a sign of cancer and does not affect sexual function.
Semen is composed of sperm from the epididymis and fluids from the seminal vesicles, prostate, and small mucous glands that provide fluids to nourish sperm. Thus, blood could come from injury to any of these structures. (See also Overview of Urinary Tract Symptoms.)