Men's health

Blood in Semen (Hematospermia): Why It Happens and What to Do

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Blood in semen, called hematospermia, is usually benign — no specific cause is found in about half of cases, and most clear on their own. A single painless episode in a man under 40 can be watched for a few weeks; any episode over 40, or one that persists or recurs, needs a clinician visit.

Last updated: July 2026History

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What does hematospermia actually look like?

Hematospermia means blood is present in the ejaculate. It can appear as pink, red, or dark-brown coloring — the color depends partly on how long the blood has been present in the seminal tract. The semen may show visible streaks or be uniformly discolored. Blood can enter from any part of the male reproductive tract: the prostate, seminal vesicles, urethra, epididymis, or vas deferens. 2

Most episodes resolve within one to four weeks without any intervention. In a systematic review of 2,079 patients, 88.9% of those with no identifiable cause experienced spontaneous resolution. 1

What are the most common causes of hematospermia?

In approximately half of all evaluated cases, no specific cause is found and the condition resolves on its own. 1 When a cause is identified, the most common ones include:

Prostate biopsy and other urological procedures. Transrectal ultrasound-guided prostate biopsy is the single most common identifiable cause. Hematospermia is an expected side effect lasting three to six weeks, sometimes up to three months, because the seminal vesicles sit adjacent to the biopsy site and retain blood in their storage chambers as they clear. Cystoscopy and vasectomy can produce similar, shorter-lived effects. 2

Prostatitis and seminal vesiculitis. Infection or inflammation of the prostate or seminal vesicles accounts for a substantial share of identifiable cases — urogenital infections and inflammatory conditions together account for roughly 20% each in large series. 1 These can follow sexually transmitted infections, urinary tract bacteria, or arise without an obvious source.

Prostatic and seminal vesicle calculi. Stones or calcifications within the prostate or seminal vesicles were identified in approximately 9.5% of patients with hematospermia in one large systematic review. 1

Prolonged sexual abstinence followed by activity, or minor trauma. Small blood vessels in the seminal vesicles or prostate can rupture under these circumstances without any underlying pathology. 3

What are less common but important causes?

Benign prostatic hyperplasia (BPH) — an enlarged but non-cancerous prostate — can occasionally cause hematospermia, particularly in men over 40 who also have urinary symptoms like hesitancy or frequent nighttime urination.

Uncontrolled high blood pressure has been documented as a cause. In case series, systemic hypertension accounted for approximately 7.7% of identified causes. 1 One published case report documented complete resolution of hematospermia after blood pressure was brought under control with medication, underscoring that measuring blood pressure at presentation is a simple, useful step. 4

Bleeding disorders or anticoagulant medications — warfarin, apixaban, or high-dose aspirin — increase bleeding tendency throughout the body and can predispose to hematospermia.

Tuberculosis was identified in approximately 5.5% of cases in global series, a relevant consideration with appropriate travel or exposure history. 1

Prostate or urological malignancy. While uncommon as a cause of hematospermia, malignancy was identified in approximately 5.4% of patients over 40 in a systematic review, with prostate cancer accounting for 90.5% of those malignant cases. 1 This is the reason evaluation is recommended for any episode in men over 40 and for recurrent or persistent cases — not because cancer is the likely cause, but because it needs to be excluded when risk factors are present. 2

Is it safe to wait and watch, or should I see a clinician now?

For most men under 40 with a single episode and no other symptoms, a period of observation of two to four weeks is a reasonable first step. If the hematospermia resolves and does not recur, no further workup may be required — though a brief conversation with a clinician is still worthwhile. 2

See a clinician within days to a week if any of the following apply:

  • The episode is associated with pain, fever, chills, or urinary symptoms
  • You are over 40
  • There is a family history of prostate cancer
  • You are on blood-thinning medications
  • The hematospermia recurs or persists beyond a few weeks
  • There is also blood in the urine 123

After a prostate biopsy: hematospermia is expected and may persist for several weeks. No separate workup is needed unless it continues unusually long or is accompanied by fever and signs of infection. 2

What does the evaluation typically involve?

A clinician will take a detailed history — number of episodes, timing, associated symptoms, recent procedures, sexual history, travel history, medications — and perform a physical examination including a digital rectal exam to assess the prostate for size, tenderness, and texture. 3

Depending on what the history and exam suggest, the evaluation may include:

  • Urinalysis and urine culture — to check for infection or concurrent blood in the urine
  • STI testing (NAAT for chlamydia, gonorrhea) — for sexually active men with exposure history
  • PSA (prostate-specific antigen) — prostate assessment, particularly in men over 40
  • Coagulation studies — if a bleeding disorder is suspected
  • Transrectal ultrasound (TRUS) — primary imaging for recurrent or unexplained cases; can identify prostate or seminal vesicle abnormalities, stones, or cysts
  • MRI — when ultrasound findings are inconclusive; provides superior soft-tissue detail

For most men, particularly those under 40 with a first episode, history, physical exam, and basic labs are sufficient. Imaging is typically reserved for recurrent symptoms, elevated PSA, or abnormal physical findings. 31

What factors change the picture?

FactorWhat it means for evaluation
Age over 40The likelihood of a structural or malignant cause increases; any episode warrants evaluation 12
Anticoagulants or antiplatelet medicationsBleeding tendency is increased throughout the body; hematospermia still warrants evaluation, though the medication itself may be the cause
Recent prostate biopsyExpected side effect for weeks to months; no separate workup unless symptoms are unusually prolonged or there are signs of infection
Uncontrolled hypertensionBlood pressure measurement at presentation is a simple, low-cost step that can identify serious cardiovascular pathology 4
STI risk factorsNew sexual partners or unprotected sex should prompt targeted STI testing
Travel history or TB exposureTuberculosis is an underappreciated cause in relevant populations 1

Common questions

In most men — especially those under 40 with a single isolated episode — it is not serious and resolves on its own without a specific cause being found. However, it should not be dismissed entirely: in men over 40, or with recurrent or painful episodes, evaluation is needed to rule out the small fraction of cases where a treatable underlying condition is present.

Hematospermia is a well-recognized, expected side effect after prostate biopsy. It typically lasts three to six weeks, though some men notice discoloration for up to three months as the seminal vesicles gradually clear the retained blood. It does not indicate ongoing damage and poses no risk to a partner. No separate evaluation is needed unless it persists unusually long or is accompanied by fever.

Rarely. In a systematic review of over 2,000 patients with hematospermia, malignancy was identified in approximately 5.4% — and almost all of those were in men over 40. 1 In younger men with a single episode and no other symptoms, cancer is an uncommon cause. That said, evaluation is appropriate for men over 40 or those with recurrent episodes to rule it out.

Yes, though it is not the most common cause. Uncontrolled hypertension appears in some case series as an identifiable cause of hematospermia. One documented case resolved completely once blood pressure was treated. 4 For this reason, a blood pressure check is a simple and useful part of the initial clinical assessment.

Useful questions to discuss with a clinician include: Given my age and symptoms, do I need evaluation now or is watching for a few weeks reasonable? Should I have STI testing or a PSA? If no cause is found, how long should I expect this to resolve on its own? When should I come back if it continues or recurs?

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When to see a clinician

  • —Hematospermia with painful urination, fever, or chills — see a clinician promptly (possible infection requiring treatment)
  • —Any episode in a man over 40 — warrants evaluation to rule out prostate or urological pathology
  • —Recurrent or persistent hematospermia lasting more than two to four weeks
  • —Hematospermia alongside blood in the urine
  • —Hematospermia in a man with a known bleeding disorder or on anticoagulant medications
  • —Associated pelvic or perineal pain that does not resolve

This article is general health education and is not a diagnosis, medical advice, or a substitute for evaluation by a licensed clinician. Any man over 40 experiencing blood in semen, or any man with recurrent, persistent, or symptomatic episodes, should be seen by a clinician.

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References

  1. 1.Madhushankha M, Jayarajah U, Abeygunasekera AM (2021). Clinical characteristics, etiology, management and outcome of hematospermia: a systematic review. American Journal of Clinical and Experimental Urology. PMID 33816690 ✓Epidemiology, etiology breakdown, malignancy rate (5.4% in men over 40), unknown etiology rate (51.8%), spontaneous resolution (88.9%), urogenital infections (20.1%), calculi (9.5%), hypertension (7.7%), tuberculosis (5.5%)
  2. 2.Mathers MJ, Degener S, Sperling H, Roth S (2017). Hematospermia — a Symptom With Many Possible Causes. Deutsches Ärzteblatt International. doi:10.3238/arztebl.2017.0186 ✓Common causes including prostate biopsy and infection, age-stratified risk, evaluation approach for single vs. recurrent episodes, prostate biopsy as leading iatrogenic cause
  3. 3.Suh Y, Gandhi J, Joshi G, Lee MY, Weissbart SJ, Smith NL, Joshi G, Khan SA (2017). Etiologic classification, evaluation, and management of hematospermia. Translational Andrology and Urology. doi:10.21037/tau.2017.06.01 ✓Ten-category etiologic classification, evaluation algorithm including TRUS and MRI, treatment strategy including patient reassurance and specialist indications, diagnostic imaging hierarchy
  4. 4.Amasanti M, Huang C, Lovell B (2017). Hematospermia as a manifestation of severe hypertension in a young man. Clinical Case Reports. doi:10.1002/ccr3.849 ✓Hypertension as a cause of hematospermia; complete resolution after blood pressure treatment; blood pressure check as a simple initial step

4 sources, numbered by first appearance. General health information, not medical advice. AI-assisted editorial content — every citation independently verified. Editorial policy

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