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Semen is composed of sperm, seminal fluid and prostatic fluid. Sperm is produced in the testes, stored in the epididymis and transported via the vas derentia into the urethra where the seminal vesicles and prostate gland add their respective fluids. The resulting semen passes through the urethra during ejaculation. The source of blood may therefore be in any one of the preceding components.
- Iatrogenic: prostate biopsy, misplaced haemorrhoidal injection
- Prostatic calculi
- Bleeding disorders