Blood in Semen (Haematospermia):
Causes, When to Worry & When to See a Urologist
Blood in semen (haematospermia) is usually harmless and often settles without treatment. Although seeing blood during ejaculation can be alarming, it is most commonly caused by inflammation, infection, or minor bleeding from the prostate or seminal vesicles rather than cancer.
However, recurrent episodes, blood in the urine, pain, fever, or symptoms in men over 40 should be assessed to identify the underlying cause.
What Is Blood in Semen?
Blood in semen, also called haematospermia, means that blood is present in the ejaculate.
The semen may appear:
- Bright red
- Pink
- Brown
- Rust-coloured
- Dark red
Sometimes only a small streak of blood is visible, while in other cases the entire semen appears discoloured.
Blood in semen is an uncommon symptom, but when it occurs it is usually temporary. In younger men, a serious underlying cause is rarely found.
Is Blood in Semen Serious?
Unlike blood in the urine, blood in the semen is much less likely to be caused by a serious underlying condition.
For many healthy men under the age of 40 who experience a single episode without any other symptoms, no serious cause is found.
Nevertheless, persistent or recurrent haematospermia should be evaluated, particularly in men over 40 or those with additional urinary symptoms.
Common Causes of Blood in Semen
Recent Medical Procedures
Blood in the semen is common after:
- Prostate biopsy
- Vasectomy
- Cystoscopy
- Catheter insertion
- Prostate surgery
This is usually expected and gradually resolves over several weeks.
Inflammation
Inflammation of the prostate (prostatitis), seminal vesicles, or other reproductive glands can cause small blood vessels to bleed into the semen.
Infection
Urinary tract infections and sexually transmitted infections can occasionally cause haematospermia.
Possible symptoms include:
- Burning during urination
- Pelvic discomfort
- Fever
- Painful ejaculation
- Urethral discharge
Enlarged Prostate
An enlarged prostate (BPH) may occasionally contribute to blood in the semen because enlarged blood vessels within the prostate can bleed more easily.
Vigorous Sexual Activity
Occasionally, frequent ejaculation, prolonged sexual activity, or prolonged abstinence may lead to minor bleeding from delicate blood vessels.
Small Benign Cysts or Stones
Small cysts or calcifications within the prostate or seminal vesicles may occasionally cause recurrent haematospermia.
Cancer
Cancer is an uncommon cause of blood in the semen.
Although prostate, seminal vesicle, bladder, or testicular cancers can occasionally present with haematospermia, most men with isolated blood in the semen do not have cancer.
The likelihood increases if blood in the semen is accompanied by:
- A persistently raised PSA
- An abnormal prostate examination
- Blood in the urine
- Weight loss
- Bone pain
- Persistent symptoms
Other Symptoms That May Occur
Depending on the underlying cause, you may also notice:
- Pain during ejaculation
- Pelvic pain
- Pain between the scrotum and anus
- Burning during urination
- Frequent urination
- Fever
- Blood in the urine
- Testicular discomfort
When Should You See a Urologist?
Arrange an assessment if:
- Blood in the semen occurs repeatedly
- It continues for several weeks
- You are over 40 years old
- There is blood in the urine
- You have pain, fever, or urinary symptoms
- There is a lump in the testicle
- You have unexplained weight loss
- Your PSA is raised
- You have a strong family history of prostate cancer
How Is Blood in Semen Investigated?
Many men do not require extensive testing. The tests recommended depend on factors such as your age, whether the bleeding occurred once or repeatedly, the presence of urinary symptoms, your PSA level, and whether blood is also present in the urine.
Urine tests
To look for infection or blood.
Blood tests
Including PSA where appropriate.
Sexually Transmitted Infection (STI) testing
If infection is suspected.
Ultrasound
Ultrasound of the urinary tract or scrotum may be recommended in selected cases.
MRI
MRI of the prostate may be considered if symptoms persist or PSA is abnormal.
Cystoscopy
Occasionally recommended if there is persistent blood in the urine or suspected abnormalities within the bladder or urethra.
Most men do not require every investigation. Tests are selected according to the clinical situation.
How Is Blood in Semen Treated?
Treatment aims to address the underlying cause rather than simply stopping the bleeding.
Management may include:
| Cause | Possible treatment |
|---|---|
| Infection | Antibiotics if indicated |
| Prostatitis | Medication and supportive treatment |
| Enlarged prostate | Observation or medication |
| After prostate biopsy | Usually reassurance |
| Unknown cause | Observation and follow-up |
Many episodes resolve without any specific treatment.
Can Blood in Semen Go Away on Its Own?
Yes.
Many men experience only one episode, and the semen returns to its normal appearance within several ejaculations.
If the bleeding continues or recurs, further assessment is recommended to exclude underlying conditions.
Frequently Asked Questions
Does blood in semen mean prostate cancer?
Usually not. Most cases are caused by benign conditions such as inflammation, infection, or minor bleeding from the prostate or seminal vesicles.
Is blood in semen a sexually transmitted infection?
Not necessarily. Some sexually transmitted infections can cause haematospermia, but many cases are unrelated to STIs.
Should I stop having sex if there is blood in my semen?
Unless advised otherwise by your doctor, sexual activity is generally safe. However, if an infection is suspected, avoiding sexual contact until assessment and treatment is sensible.
Can blood in semen happen after a prostate biopsy?
Yes. Blood in the semen is common after a prostate biopsy and may persist for several weeks. This is usually expected and gradually improves.
Is blood in semen common after a vasectomy?
Yes. A small amount of blood in the semen can occur during the early recovery period after a vasectomy and usually resolves without treatment.
Can blood in semen affect fertility?
Occasional haematospermia does not usually affect fertility. However, if it is caused by a chronic infection or another underlying condition, further evaluation may be recommended.
How long does blood in semen usually last?
Many episodes resolve after one or several ejaculations. Blood in the semen following a prostate biopsy may persist for several weeks before gradually clearing. If bleeding continues or recurs, further assessment is recommended.
Can exercise cause blood in semen?
Vigorous physical activity itself is not usually the direct cause. However, strenuous exercise, prolonged cycling, or increased pressure within the pelvis may occasionally contribute in susceptible individuals. Persistent or recurrent bleeding should still be assessed.
Concerned about blood in your semen?
Seeing blood in your semen can be worrying, but it does not usually mean you have a serious condition. A consultation can help determine whether it is likely to settle on its own or whether further investigation is recommended based on your age, symptoms, and medical history.
If the bleeding is recurrent, accompanied by pain, fever, blood in the urine, or other urinary symptoms, an assessment by a urologist may be appropriate to identify the underlying cause and discuss the most suitable next steps.
Arrange a consultation with Dr Roger Anthony Idi, Consultant Urologist at Prince Court Medical Centre, Kuala Lumpur, if you would like a specialist assessment of persistent or recurrent blood in the semen.