High PSA: what it means and what to do

A high PSA is not a diagnosis. Often it comes from an enlarged prostate, inflammation or an infection. The first step is to repeat it. If it stays high, your doctor usually asks for an MRI scan before thinking about a biopsy.

What a high PSA means

It means the prostate is releasing more PSA into your blood than usual. That happens when it grows, is inflamed or infected, or when there is a cancer.

Between 3 and 10 ng/mL, guidelines say to repeat the PSA before any other test if you have no symptoms. Often the second result is lower.

Above 10 a cancer is more likely, but an infection or prostatitis can give values even higher.

What causes a high PSA

The most common causes are not cancer.

• An enlarged prostate: The prostate grows with age, and that is normal. The bigger it is, the more PSA it makes.
• Prostatitis: Inflammation of the prostate, sometimes without symptoms, can raise it a lot.
• A urine infection: Even a recent infection raises it. It can take a few months to come back down.
• Ejaculation and cycling: In the days before the test they can raise it a little.
• Procedures and catheters: A catheter or a biopsy raises it for some weeks.
• Prostate cancer: One of the possible causes. Often, when PSA finds it, it is small and slow-growing.

Symptoms of a high PSA

A high PSA causes no symptoms. If there are any, they come from the cause. For example:

• Passing urine often, also at night, with a weak stream
• Trouble starting or emptying your bladder
• Burning when you pass urine, or fever, with an infection or prostatitis
• Blood in your urine or semen

Early prostate cancer usually causes no symptoms. That is why it is worth talking to your doctor even when you feel well.

High PSA: what happens next

First the PSA is repeated, away from infections, ejaculation and cycling. Your doctor may also ask for free PSA: the lower the free share, the more likely a cancer.

If it stays high, an MRI scan of the prostate usually comes next. If the scan is reassuring, following PSA over time is often enough.

A urologist decides on a biopsy, usually based on the scan. Many cancers found this way are slow and can simply be monitored.

Which tests to read alongside it

These tests help show where it comes from.

What your result means

The upper end of the scale, in ng/mL.

• 1 to 3: Normal. It is normal. It rises a little with age, partly because the prostate grows. If it does not run in your family, it is usually rechecked after a couple of years. Decide with your doctor.
• 3 to 4: Worth a look. Many lab reports still call it normal. In screening programmes, from 3 upwards it is looked at more closely. Talk to your doctor. Usually the PSA is repeated before any other test.
• Above 4, up to 10: High. Often it comes from an enlarged or inflamed prostate. In some men there is a cancer, usually found early. Repeat the PSA and talk to your doctor. They may ask for free PSA, a urologist visit or an MRI scan.
• Above 10: Very high. A cancer is more likely. An infection or prostatitis can give values like this too, though. See your doctor soon: they usually refer you to a urologist.

What to do if your PSA is high

Where to start:

• Do not panic: a high PSA on its own does not say there is a cancer.
• Repeat the test after a few weeks, with no ejaculation in the two days before and no long bike rides.
• If you have an infection, treat it first and repeat the PSA afterwards, as your doctor advises.
• Bring your doctor your earlier results: how it changes over time counts.
• If it stays high, your doctor refers you to a urologist, who may ask for an MRI scan.

If you take finasteride or dutasteride, tell your doctor: they lower PSA, and the value has to be read differently. Do not stop them on your own.

High PSA: when to worry

Talk to your doctor if:

• Your PSA is above the range on your report on a second test.
• It rises from one check to the next.
• Your father or a brother has had prostate cancer.
• It is above 10 ng/mL: see your doctor soon.
• You have bone pain that does not go away, or blood in your urine: see your doctor soon.
• You cannot pass urine at all, or you have a high fever with chills and burning when you pass urine: call 112 or go to the emergency department.

Frequently asked questions

When is a high PSA a worry? If it stays high on a second test or rises over time, talk to your doctor. Above 10 ng/mL, see your doctor soon. Even then it is often not cancer.

What causes a high PSA other than cancer? An enlarged prostate, prostatitis, urine infections, ejaculation or long bike rides in the days before, catheters and biopsies.

What does a PSA between 4 and 10 mean? It is high, but often it comes from an enlarged or inflamed prostate. The PSA is repeated, and your doctor may ask for free PSA or an MRI scan.

Can a high PSA go back to normal? Yes, if the cause is an infection or prostatitis. Sometimes it takes a few months. That is why your doctor repeats it after treatment.

What is free PSA? The part of PSA that is not bound to proteins. Your doctor looks at how much of the total it makes up: if it is low, a cancer is more likely.

Do I need a biopsy if my PSA is high? Not straight away. Usually the PSA is repeated and an MRI scan is done first. A urologist decides on a biopsy, usually based on the scan.

Sources

• Council Recommendation of 9 December 2022 on strengthening prevention through early detection: a new EU approach on cancer screening. Official Journal of the European Union, 2022. Raccomandazione del Consiglio 2022/C 473/01
• Cornford and colleagues, EAU, EANM, ESTRO, ESUR, ISUP and SIOG guidelines on prostate cancer, 2024 update, part I: screening, diagnosis and local treatment with curative intent. European Urology, 2024. PMID 38614820
• Regione Lombardia, the Lombardy prostate cancer screening programme: who can take part and how it works. Regione Lombardia, screening tumore della prostata
• Oesterling and colleagues, serum prostate-specific antigen in a community-based population of healthy men: establishment of age-specific reference ranges. JAMA, 1993. PMID 7688054
• Catalona and colleagues, use of the percentage of free prostate-specific antigen to enhance differentiation of prostate cancer from benign prostatic disease: a prospective multicenter clinical trial. JAMA, 1998. PMID 9605898