What Can Cause PSA to Rise or Fall?

A PSA test is one of the most commonly used blood tests for evaluating prostate health and assessing prostate cancer risk.

But PSA levels are not fixed.

A man's PSA can change over time for several reasons, and an elevated PSA does not automatically mean prostate cancer is present.

Understanding the factors that affect PSA levels can help put an unexpected test result into perspective.

PSA stands for prostate specific antigen, a protein produced primarily by prostate cells. Small amounts normally enter the bloodstream, where they can be measured through a blood test.

PSA can increase because of prostate enlargement, inflammation, infection, cancer, or other factors. It can also change because of medications and certain medical procedures.

For this reason, doctors generally interpret PSA in context rather than relying on one number alone.

What Does PSA Measure?

PSA is a protein produced primarily by cells in the prostate.

The PSA blood test measures the amount of PSA circulating in the bloodstream, usually reported in nanograms per milliliter (ng/mL).

PSA can provide useful information about prostate health, but it is not specific to prostate cancer.

Several different conditions can cause PSA levels to rise.

This is why understanding what may affect PSA is important when interpreting a test result.

1. Age

Age is one of the most important factors associated with PSA levels.

PSA levels tend to increase as men get older.

One reason is that the prostate commonly becomes larger with age.

Because more prostate tissue can produce more PSA, an older man may naturally have a higher PSA than a younger man.

This is one reason healthcare professionals consider age when interpreting PSA results.

A PSA number should therefore not always be viewed using the same threshold for every man.

2. Benign Prostatic Hyperplasia (BPH)

Benign prostatic hyperplasia, or BPH, is an enlargement of the prostate that becomes increasingly common with age.

BPH is not prostate cancer.

However, because a larger prostate contains more prostate tissue, it can produce more PSA.

This means a man with BPH may have an elevated PSA even when prostate cancer is not present.

BPH may also cause urinary symptoms such as:

  • Weak urine stream

  • Difficulty starting urination

  • Urinary frequency

  • Urgency

  • Dribbling

  • Incomplete bladder emptying

  • Nighttime urination

When an elevated PSA occurs alongside urinary symptoms, a healthcare professional may consider BPH as one possible explanation.

3. Prostatitis and Prostate Inflammation

Inflammation of the prostate can increase PSA.

Prostatitis is a general term for inflammation involving the prostate.

Depending on the type, prostatitis may cause:

  • Pelvic discomfort

  • Burning during urination

  • Urinary frequency

  • Urinary urgency

  • Pain with ejaculation

  • Difficulty urinating

Inflammation can temporarily increase PSA levels.

If a PSA test is performed during or shortly after an episode of prostate inflammation or infection, the result may be higher than the man's usual baseline.

A healthcare professional may consider this when deciding whether PSA should be repeated later.

4. Prostate Cancer

Prostate cancer can cause PSA levels to increase.

This is one of the reasons PSA testing is used as part of prostate cancer screening and evaluation.

However, an elevated PSA does not prove that prostate cancer is present.

BPH, prostatitis, and other factors can also increase PSA.

Similarly, some men with prostate cancer may have PSA levels that are not particularly high.

This is why PSA is considered one piece of information rather than a definitive diagnosis.

5. Ejaculation

Ejaculation may temporarily affect PSA levels in some men.

Because PSA plays a role in semen, ejaculation can cause a short-term change in circulating PSA.

The effect is generally temporary.

When a PSA result is close to a decision threshold, a healthcare professional may recommend avoiding ejaculation for a period of time before testing to reduce the possibility of a temporary elevation.

Following the specific instructions provided by the healthcare professional or laboratory is important.

6. Prostate Procedures or Manipulation

Certain procedures involving the prostate can temporarily affect PSA levels.

Examples may include:

  • Prostate biopsy

  • Certain prostate examinations or procedures

  • Catheterization in some circumstances

  • Other instrumentation involving the urinary tract or prostate

The effect depends on the procedure and the individual.

If you recently underwent a prostate related procedure, tell your healthcare professional before having a PSA test.

They can determine whether the timing of the test could influence the result.

7. Urinary Tract Problems

Certain urinary conditions can be associated with changes in PSA.

For example, urinary infection or inflammation involving the urinary tract or prostate may influence PSA levels.

In some cases, urinary retention, the inability to completely empty the bladder, may also affect PSA.

This is another reason a healthcare professional may want to understand a man's recent urinary history before interpreting an elevated PSA.

8. Certain Medications Can Lower PSA

Some medications can affect PSA levels in the opposite direction by lowering the measured PSA.

Two important examples are:

  • Finasteride

  • Dutasteride

These medications are known as 5-alpha-reductase inhibitors and are commonly used to treat BPH.

They reduce the production of dihydrotestosterone (DHT), which can shrink the prostate and lower PSA levels.

Because these medications can reduce PSA, healthcare professionals take them into account when interpreting PSA results.

Men taking medications for BPH should always tell their healthcare provider before PSA testing.

9. Obesity and PSA Levels

Body weight may also influence PSA measurements.

Research has found that men with obesity can have lower PSA concentrations in the blood compared with men of normal weight.

Several mechanisms have been proposed, including differences in blood volume and hormonal factors.

This does not mean that obesity protects against prostate cancer or that a lower PSA is necessarily reassuring.

Instead, it is another reason PSA should be interpreted within the context of the individual's overall health and risk factors.

10. Recent Medical Conditions

A man's overall health around the time of testing can sometimes affect PSA.

For example, an acute illness involving the urinary system or prostate may temporarily change PSA.

If you have recently experienced:

  • Fever

  • Urinary burning

  • Pelvic pain

  • Difficulty urinating

  • A urinary infection

  • Prostate inflammation

tell your healthcare professional.

The timing of the PSA test may matter when interpreting the result.

Why One PSA Test Doesn't Tell the Whole Story

One of the most important concepts in understanding PSA is that a single measurement is only a snapshot.

A man's PSA can naturally fluctuate.

For that reason, healthcare professionals may look at previous PSA results and consider the overall trend.

For example, a PSA that has remained relatively stable over several years provides different information from a PSA that has changed significantly over time.

This does not mean that every increase indicates cancer.

It simply means that changes in PSA may provide useful context.

What Should You Do If Your PSA Is Higher Than Expected?

An unexpectedly elevated PSA does not automatically mean something is wrong.

Depending on the situation, a healthcare professional may:

  1. Review your previous PSA results.

  2. Ask about urinary symptoms.

  3. Review medications.

  4. Ask about recent infections or inflammation.

  5. Consider recent prostate procedures.

  6. Repeat the PSA test.

  7. Order additional testing.

  8. Recommend evaluation by a urologist.

The appropriate next step depends on the individual.

It is generally better to understand why the PSA is elevated than to assume the worst based on one result.

Can You Control Your PSA Level?

Some factors affecting PSA cannot be controlled.

Age and prostate size, for example, naturally change over time.

Other factors can sometimes be addressed.

Maintaining overall health, managing medical conditions, following appropriate treatment for prostate problems, and discussing medications with your healthcare provider can all contribute to a more accurate understanding of your PSA.

It is important not to intentionally manipulate PSA levels before testing.

The goal of PSA testing is to obtain useful information about prostate health—not simply to produce a lower number.

Frequently Asked Questions About PSA Levels

What causes PSA levels to rise?

PSA can rise because of BPH, prostatitis, prostate inflammation, prostate cancer, urinary problems, certain procedures, and other factors.

Can ejaculation raise PSA?

Ejaculation can temporarily affect PSA levels in some men. Follow your healthcare provider's instructions regarding preparation for PSA testing.

Can BPH cause high PSA?

Yes. An enlarged prostate contains more prostate tissue and can produce more PSA.

Can prostatitis raise PSA?

Yes. Prostate inflammation can cause a temporary increase in PSA.

Can medications lower PSA?

Yes. Finasteride and dutasteride can significantly lower PSA levels and should be considered when interpreting the test.

Does a high PSA mean prostate cancer?

No. An elevated PSA can have several causes, including BPH and prostatitis. Additional evaluation may be needed to determine the reason for the elevation.

Can PSA levels change from one test to another?

Yes. PSA can fluctuate over time, which is why healthcare professionals may consider multiple test results rather than relying on a single measurement.

Does age affect PSA?

Yes. PSA tends to increase as men get older, partly because prostate enlargement becomes more common with age.

The Bottom Line: PSA levels can be affected by many factors, and an elevated PSA does not automatically mean prostate cancer.

Age, prostate size, BPH, prostatitis, prostate cancer, urinary conditions, recent procedures, ejaculation, medications, and other factors can all influence PSA.

Some factors can cause PSA to temporarily rise, while medications such as finasteride and dutasteride can lower PSA.

This is why a PSA result should be interpreted in context.

If your PSA is higher than expected, don't assume that the result means cancer, and don't ignore it either.

Instead, discuss the result with your healthcare professional.

Looking at your previous PSA levels, symptoms, medications, prostate health, family history, and other risk factors can provide a much clearer picture than a single number.

Understanding the factors that affect PSA levels can help men become more informed about prostate health and have better conversations with their healthcare providers.


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References

American Urological Association. (2023). Early detection of prostate cancer: AUA/SUO guideline. American Urological Association.

National Cancer Institute. (2024). Prostate-specific antigen (PSA) test. U.S. Department of Health and Human Services.

National Institute of Diabetes and Digestive and Kidney Diseases. (2024). Enlarged prostate (benign prostatic hyperplasia). U.S. Department of Health and Human Services.

National Institute of Diabetes and Digestive and Kidney Diseases. (2024). Prostatitis: Inflammation of the prostate. U.S. Department of Health and Human Services.

U.S. Preventive Services Task Force. (2018). Screening for prostate cancer: U.S. Preventive Services Task Force recommendation statement. JAMA, 319(18), 1901–1913.

Loeb, S., Carter, H. B., Berndt, S. I., Ricker, W., & Schaeffer, E. M. (2014). Is repeat PSA testing useful in men with PSA levels 2.5 to 4 ng/mL? Urology, 83(2), 274–279.