The presence of blood in semen (the fluid discharged upon ejaculation) may be caused by inflammation, infection, obstruction or trauma.
Review Date 10/4/2016
Updated by: Jennifer Sobol, DO, urologist with the Michigan Institute of Urology, West Bloomfield, MI. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.