Raised PSA, Enlarged Prostate and Prostate Cancer: Understanding the Difference
Updated: 4 days ago
A raised PSA result often causes concern about prostate cancer. However, PSA is not a cancer-specific test. It can be increased by several prostate conditions, including benign prostate enlargement, also known as benign prostatic hyperplasia or BPH.
Understanding the relationship between PSA, BPH and prostate cancer can help patients interpret their result more accurately and understand why further assessment may sometimes be recommended.
What Is PSA?
Prostate-specific antigen, or PSA, is a protein produced by cells within the prostate. A small amount normally enters the bloodstream and can be measured with a blood test. The PSA test may help identify changes within the prostate, but it cannot diagnose prostate cancer on its own. A raised result indicates that the prostate may require further assessment, rather than confirming that cancer is present. PSA levels may be influenced by age, prostate size and several other factors. There is therefore no single PSA value that has the same significance for every patient.
How Does an Enlarged Prostate Affect PSA?
The prostate commonly becomes larger with age. This non-cancerous enlargement is called benign prostatic hyperplasia, or BPH. Because PSA is produced by prostate tissue, a larger prostate may release more PSA into the bloodstream. Men with BPH may therefore have a higher PSA even when no prostate cancer is present.
BPH can also cause urinary symptoms, including:
A weak or interrupted urinary stream
Difficulty starting urination
Needing to pass urine more frequently
Waking at night to urinate
Urgency
A feeling that the bladder has not emptied completely
These symptoms should be assessed, particularly when they are new, progressive or affecting quality of life. You can read more about prostate enlargement and BPH.
Does BPH Cause Prostate Cancer?
BPH and prostate cancer are different conditions. Benign prostate enlargement does not turn into prostate cancer. However, both conditions become more common with increasing age and can exist at the same time. A patient with urinary symptoms caused by BPH may still require an appropriate prostate cancer risk assessment, depending on age, examination findings, PSA results, family history and other relevant factors. Similarly, the presence of a raised PSA should not automatically be attributed to BPH without considering the wider clinical picture.
You can find further information about diagnosis, investigations and treatment options on the prostate cancer page.
Can Symptoms Distinguish BPH From Prostate Cancer?
Urinary symptoms are more commonly caused by benign prostate enlargement than by early prostate cancer. Early prostate cancer frequently causes no symptoms at all. For this reason, symptoms alone cannot reliably confirm or exclude prostate cancer. Assessment may include a discussion of urinary symptoms and medical history, examination of the prostate when appropriate, urine testing and a PSA blood test. Visible blood in the urine, unexplained weight loss or persistent bone pain require medical assessment, although these symptoms can also have causes other than prostate cancer.
What Else Can Cause a Raised PSA?
In addition to BPH and prostate cancer, PSA may be temporarily increased by:
Prostatitis or another urinary infection
Recent ejaculation
Vigorous exercise, particularly cycling
Urinary retention
Recent catheterisation or prostate procedures
Recent prostate surgery or biopsy
Medicines used to treat prostate enlargement, particularly finasteride and dutasteride, can lower PSA. Patients should therefore tell the clinician interpreting the result about any medication they are taking. The timing and circumstances of the blood test are important. In some situations, repeating the PSA under more standardised conditions may provide a more meaningful result.
What Happens After a Raised PSA Result?
A raised PSA does not necessarily mean that an immediate biopsy is required. The appropriate next step depends on the PSA level, previous results, age, prostate size, symptoms, examination findings and individual risk factors. The clinician may recommend repeating the PSA, particularly when the elevation is mild or when there may have been a temporary cause. The trend over time can sometimes provide more useful information than one isolated result.
If the PSA remains raised or there are other concerning features, referral for specialist assessment may be appropriate. This may include a multiparametric MRI scan of the prostate. MRI can help identify areas that require closer investigation and assist in deciding whether a prostate biopsy should be considered.
Read more in When Should a PSA Test Be Repeated?
Does Every Raised PSA Require Treatment?
No. PSA is a test result, not a diagnosis.
If investigations suggest that the PSA elevation is related to BPH, treatment is usually guided by the severity of urinary symptoms, the effect on quality of life and whether complications such as urinary retention, recurrent infections or bladder problems are present. Treatment for BPH may include monitoring, lifestyle measures, medication or a procedure to improve urinary flow.
If prostate cancer is diagnosed, management depends on the cancer’s grade, stage and risk category, as well as the patient’s general health and personal priorities. Options may include active surveillance, surgery, radiotherapy, hormone treatment or a combination of treatments.
When Should I Seek Medical Advice?
Consider discussing a PSA test or prostate assessment if you develop persistent urinary symptoms, have a family history of prostate cancer or are concerned about your individual risk. More urgent assessment is appropriate if you are unable to pass urine, develop fever with urinary symptoms, experience severe pain or notice visible blood in the urine.
Frequently Asked Questions
Does a high PSA always mean prostate cancer?
No. PSA can be raised by benign prostate enlargement, infection, inflammation and several temporary factors. Further assessment is required to understand the possible cause.
Can BPH and prostate cancer occur together?
Yes. They are separate conditions, but both become more common with age and may be present at the same time.
Can I have prostate cancer with a normal PSA?
It is possible. PSA testing can help assess risk, but it cannot identify every prostate cancer. The result should be interpreted alongside other clinical information.
Should an abnormal PSA be repeated?
Sometimes. Repeating the test may be appropriate when the elevation is mild, when a temporary cause is suspected or when the clinician wants to confirm the trend before arranging further investigations.
Will I need an MRI scan?
An MRI may be recommended when the PSA remains raised or other findings indicate an increased risk of prostate cancer. The decision is individual and should be discussed with a urologist.
Arrange a Consultation
If you have received a raised PSA result, are experiencing urinary symptoms or would like to discuss your prostate cancer risk, Dr Carlo Bravi offers private urology consultations in London and Northampton.
An individual assessment can help determine whether the PSA should be repeated, whether further investigations are appropriate and whether urinary symptoms may be related to benign prostate enlargement.
This article provides general information and does not replace individual medical assessment.
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