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Semen is produced by the prostate and seminal vesicles and passes through the ejaculatory ducts and urethra. Inflammation, infection, fragile vessels, or minor trauma in any of these structures can leak a small amount of blood into semen. Anticoagulants and high ejaculatory frequency (or prolonged abstinence then vigorous activity) can lower the threshold for bleeding. In men >45 years or with persistent/recurrent episodes, consider structural causes (e.g., seminal vesicle/prostate pathology) and coexisting haematuria.
| Red flag | Why it matters | Action |
|---|---|---|
| Age >45 with recurrent episodes (>3) or persisting >3 months | Higher pre-test probability of structural/prostatic pathology | Non-urgent urology referral; PSA & DRE |
| Visible haematuria or persistent microscopic haematuria | Bladder/upper tract causes; separate pathway (RCC/TCC risk) | Follow haematuria pathway; urology assessment |
| Abnormal DRE or raised age-adjusted PSA | Possible prostate malignancy | 2WW (suspected cancer) as per local protocol |
| Systemic features: fever, weight loss, bone pain | Infection/malignancy | Urgent assessment; targeted tests |
| Immunosuppression or bleeding diathesis | Higher risk of significant pathology/complications | Lower threshold for referral and bloods |
๐ฌ โSeeing blood in semen is common and usually harmless. It often settles on its own. Weโll check for infection and any warning signs; if these are absent, reassurance and watchful waiting are appropriate. Come back sooner if you also see blood in the urine, develop pain/fever, or the bleeding persists.โ