The presence of blood in semen (the fluid discharged upon ejaculation) may be caused by inflammation, infection, obstruction or trauma. Update Date: 08/02/2008David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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