What does blood in semen mean?
Last updated September 3, 2026.
Usually benign despite the look: fragile vessels along the semen pathway break with exertion or after a dry spell, per MedlinePlus - one episode under 40 with no other symptoms typically needs watching, and it often clears in days to weeks. When it persists: prostatitis and other infections, recent urological procedures, stones, and rarely - mostly over 40 - prostate causes. The rules: under 40 and single - watch; over 40, recurring, or paired with pain, burning, urinary blood, fever, or a lump - exam, urine test, ultrasound. Boundary: blood in the URINE always gets checked promptly, any age.
What to do
- Apply the age-and-recurrence rule. Under 40 and once: watch. Over 40 or recurrent: check.
- Note the companions. Pain, burning, fever, lump: visit.
- Mention recent procedures. A biopsy explains it for weeks.
- Separate semen blood from urine blood. Urine blood: always prompt care.
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