Hematospermia: blood in the semen
Few things are more alarming than seeing blood in your ejaculate. The reassuring reality is that hematospermia is usually benign and resolves on its own, particularly in men under 40 — though there are specific situations where it does warrant prompt assessment.
What usually causes it
The most common cause is inflammation or infection of the prostate or seminal vesicles. Minor trauma from vigorous or prolonged sexual activity, a prolonged period without ejaculation, and small ruptured blood vessels also account for many cases.
Medical procedures are a frequent and expected cause: prostate biopsy in particular produces blood in the semen for weeks afterwards, and this is normal. Blood-thinning medication makes any of these more likely to become visible.
The colour offers a rough clue. Bright red usually indicates fresh bleeding closer to the urethra, while brown or rust-coloured suggests older blood from higher up. Neither is more serious on its own.
When it needs proper assessment
See a doctor promptly if you are over 40, if it persists beyond a few weeks or keeps recurring, or if it comes with pain on urination or ejaculation, fever, blood in the urine, or a lump. In men over 40 with persistent hematospermia, evaluation should include a prostate check, because in a small minority it is the presenting sign of prostate pathology.
In younger men with a single brief episode and no other symptoms, watchful waiting is usually appropriate, and investigation often finds no cause at all.
Hematospermia does not typically affect fertility. Where it accompanies an infection, that infection can affect sperm quality, so the underlying cause matters more than the blood itself.
FAQ
Is blood in semen serious?
Usually not, especially in men under 40, where it is most often caused by minor inflammation or small ruptured vessels and settles on its own. It needs prompt assessment if you are over 40, if it persists or recurs, or if it comes with pain, fever, blood in the urine, or a lump.
Does hematospermia affect fertility?
Not directly. Blood in the semen does not itself impair sperm. However, when it is caused by an infection or inflammation of the prostate or seminal vesicles, that underlying condition can reduce sperm quality — so it is the cause, not the blood, that matters for fertility.
How long does blood in semen last?
Most episodes resolve within a few days to a few weeks. After a prostate biopsy it commonly persists for several weeks and is expected. Blood that continues beyond about a month, or keeps returning, should be evaluated regardless of age.