Hi, Blood in the semen (Hemospermia) is usually due to infection of either seminal vesicle or prostate. However, the other cause of blood in semen like enlarged prostate has to be ruled out. Consult qualified urologist for clinical and digital rectal examination and get following basic tests done to confirm the diagnosis. 1) Urine routine and culture. 2) Ultrasound scanning of abdomen and pelvis 3) Serum PSA. Hope I have answered your query. Let me know if I can assist you further.