Hematospermia (haematospermia), (or Hemospermia, haemospermia) or the presence of bloo in semen, is most often a benign and idiopathic symptom, but can sometimes result from medical problems such as a urethral stricture, infection of the prostate, or a congenital bleeding disorder, and can occur transiently after surgical procedures such as a prostate biopsy. It is present in less than 2% of urology referrals, although prevalence in the overall population is unknown.