Difficulty starting urination, a weak urine stream, frequent urination and waking several times at night can all be signs of an enlarged prostate. But similar urinary symptoms can also occur with prostate cancer.
This can understandably raise an important question: How can you tell the difference between benign prostatic hyperplasia (BPH) and prostate cancer?
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
The key point is that symptoms alone cannot reliably distinguish BPH from prostate cancer. BPH is a non-cancerous enlargement of the prostate, while prostate cancer involves abnormal cancerous cells. Because the two conditions can overlap, doctors use a combination of medical history, examination, PSA testing, imaging and, when necessary, prostate biopsy.
If you want to understand BPH itself and its treatment options, you can also explore our guide to BPH and enlarged prostate.
BPH and Prostate Cancer Are Different Conditions
Benign prostatic hyperplasia is a non-cancerous increase in the size of the prostate. It becomes increasingly common with age and can press on the urethra, making it harder for urine to pass.
Prostate cancer, on the other hand, develops when abnormal prostate cells grow in an uncontrolled way. Some prostate cancers grow slowly and remain confined to the prostate, while others can be more aggressive and spread beyond it. Importantly, having BPH does not mean that you have prostate cancer, and BPH itself is not considered a form of prostate cancer.
Why Can They Be Difficult to Tell Apart?
The prostate sits below the bladder and surrounds part of the urethra. Changes in the prostate can therefore affect urinary function regardless of whether the underlying problem is benign enlargement or cancer. BPH commonly causes symptoms such as:
- Difficulty starting urination
- A weak or slow urine stream
- Intermittent urine flow
- Feeling that the bladder has not completely emptied
- Frequent urination
- Sudden urgency to urinate
- Waking at night to urinate
Prostate cancer can sometimes produce similar urinary symptoms, particularly when the cancer has grown enough to affect the urinary tract. However, early prostate cancer often causes no symptoms at all. This is why the presence or absence of urinary symptoms cannot by itself confirm or rule out prostate cancer.
Can Symptoms Tell You Which One You Have?
Usually, no. Some symptoms may raise concern and should be medically evaluated, but there is no specific urinary symptom that can reliably distinguish BPH from prostate cancer.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
For example, a weak urine stream is very common in men with BPH, but it can also occur with other prostate or urinary conditions. Likewise, frequent night-time urination is common with BPH but is not specific to it.
In fact, many prostate cancers are detected before they cause urinary problems. More advanced prostate cancer can cause symptoms such as persistent pain in the back, hips or pelvis, blood in the urine or semen, erectile difficulties, or problems related to cancer spreading outside the prostate. However, these symptoms can have other causes as well and should not be assumed to indicate cancer without appropriate evaluation.
What Does the Prostate Examination Tell You?
A digital rectal examination (DRE) allows a doctor to assess part of the prostate through the rectum. With BPH, the prostate often feels enlarged and relatively smooth and firm.
A prostate cancer can sometimes produce an area that feels hard, irregular or otherwise suspicious on examination. However, DRE cannot diagnose prostate cancer on its own. Some cancers may not be detectable by DRE, while an abnormal-feeling prostate can have causes other than cancer.
What Does a PSA Test Tell You?
Prostate-specific antigen (PSA) is a protein produced by prostate cells. PSA is commonly measured through a blood test when evaluating prostate health. One important limitation is that PSA is not specific to cancer.
An enlarged prostate can increase PSA levels, and prostate inflammation or infection can also cause an elevation. This means that an elevated PSA does not automatically mean that a man has prostate cancer.
At the same time, prostate cancer can occur without a very high PSA level. Therefore, PSA results need to be interpreted in context rather than using one number as a definite dividing line between BPH and cancer. The doctor may consider factors such as:
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
- The absolute PSA level
- Age and individual risk factors
- Changes in PSA over time
- Prostate volume
- PSA density
- Findings on DRE
- Family history and other risk factors
Does a High PSA Mean Prostate Cancer?
Not necessarily. A raised PSA can occur because of BPH, prostatitis or other non-cancerous causes. The higher the PSA, the greater the concern can become, but there is no single PSA value that proves a man has prostate cancer.
If PSA is unexpectedly elevated, the doctor may repeat the test after considering factors that can temporarily influence the result. Depending on the overall risk, further assessment may include imaging or other tests. This is why an elevated PSA should be viewed as a reason for further evaluation rather than a cancer diagnosis.
Where Does MRI Fit Into the Diagnosis?
If prostate cancer is suspected after the initial assessment, multiparametric MRI of the prostate can provide more detailed information about the prostate tissue.
MRI may identify areas that look suspicious for clinically significant prostate cancer and can help determine whether a targeted biopsy is appropriate.
However, MRI does not replace clinical assessment, and some benign prostate conditions can look similar to cancer on imaging. MRI findings are therefore interpreted together with PSA, PSA density, examination findings and other risk factors.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
When Is a Prostate Biopsy Needed?
A prostate biopsy is the test that can confirm prostate cancer by examining prostate tissue under a microscope. A biopsy may be considered when the overall assessment indicates a meaningful suspicion of cancer—for example, because of an abnormal DRE, concerning PSA-related findings, or a suspicious lesion on MRI.
Modern diagnostic pathways commonly use MRI before biopsy when prostate cancer is suspected. If MRI identifies a suspicious area, targeted biopsy can be used to sample that region, sometimes alongside additional systematic or perilesional samples.
A biopsy is therefore different from a PSA test or MRI: those tests can help estimate the likelihood of cancer, whereas tissue examination provides the pathological diagnosis.
A Simple Way to Think About the Diagnostic Process
Rather than asking whether one particular symptom means BPH or cancer, it is more useful to think of the evaluation as a sequence:
Urinary symptoms or prostate-related concern
↓
Medical history and clinical examination
↓
PSA and other appropriate tests
↓
Risk assessment
↓
Prostate MRI when indicated
↓
Biopsy when the level of suspicion warrants tissue diagnosis
This approach helps avoid diagnosing cancer based on symptoms or a single abnormal test.
Can You Have BPH and Prostate Cancer at the Same Time?
Yes. BPH and prostate cancer are separate conditions, and a man can have both. This is one reason why urinary symptoms should not automatically be attributed to an enlarged prostate.
If a man has established BPH but develops a concerning PSA pattern, abnormal DRE or another finding that raises suspicion of cancer, he may still need further investigation.
Similarly, treating BPH symptoms does not eliminate the need for appropriate prostate cancer evaluation when risk factors or clinical findings warrant it.
The Bottom Line
BPH and prostate cancer can look similar from a symptom perspective, but they are fundamentally different conditions. BPH is a non-cancerous enlargement of the prostate and commonly causes urinary symptoms such as weak flow, difficulty starting urination, incomplete emptying and frequent night-time urination. Prostate cancer, particularly in its early stages, may cause no symptoms at all.
That is why symptoms alone cannot reliably distinguish the two. Doctors use a combination of clinical assessment, DRE, PSA testing and, when appropriate, prostate MRI and biopsy to determine whether cancer is likely.
Most importantly, an enlarged prostate or elevated PSA does not automatically mean cancer. At the same time, urinary symptoms should not simply be assumed to be BPH without appropriate assessment, particularly when there are concerning examination findings, PSA changes or other risk factors.
The goal of evaluation is not only to identify BPH and manage its symptoms but also to recognise men who may need further investigation for prostate cancer while avoiding unnecessary testing when the likelihood of significant cancer is low.
