hello , thanks for writing to us, Blood in the semen is known as hematospermia. Prostate biopsy is the most common cause of blood in the semen. Blood in the semen can be caused by tumors, infections, anatomical abnormalities, stones, or inflammation in many sites throughout the genitourinary system. Usually blood in the semen is benign and resolves on its own. Treatment, if indicated, depends upon the underlying cause. The following conditions have been reported in association with hematospermia: Benign or malignant tumors of the prostate, bladder, testes, or seminal vesicles Infections including, but not limited to, chlamydia, herpes, cytomegalovirus, and trichomoniasis Inflammation of the prostate (prostatitis), epididymis (epididymitis), or urethra (urethritis) Calculi (stones similar to kidney stones) in the seminal vesicles or prostate Polyps in the urethra Ejaculation duct obstructions Metastatic cancers (that have spread from other sites in the body) located in the genitourinary system Cysts, hemorrhage, or other abnormalities in the seminal vesicles hope i have answered your query , take care