Early Signs of Prostate Cancer vs. BPH: What's the Difference

Why early prostate cancer rarely causes symptoms

The prostate gland sits below the bladder, surrounding the urethra. A small cancer in the outer portion of the gland — where most prostate cancers begin — does not compress the urethra and therefore does not cause urinary symptoms in its early stages.

This is a critical point: the absence of urinary symptoms does not mean the prostate is healthy. It also means that by the time symptoms appear, cancer has sometimes grown larger or spread. This is the rationale for PSA screening among men at risk 1Ref 1Wei JT, Barocas D, Carlsson S, et al. (2023).Early Detection of Prostate Cancer: AUA/SUO Guideline Part I: Prostate Cancer Screening.Clinical evaluation framework and risk-based screening context2Ref 2US Preventive Services Task Force (2018).Screening for Prostate Cancer: US Preventive Services Task Force Recommendation Statement.Background on asymptomatic early prostate cancer and rationale for PSA screening.

What symptoms can prostate cancer cause?

When prostate cancer does produce symptoms, they depend on how far the disease has progressed:

Locally advanced disease (cancer growing beyond the prostate capsule or into adjacent structures): - Difficulty starting urination or maintaining a steady stream - Increased frequency, especially at night (nocturia) - Incomplete bladder emptying - Blood in urine (hematuria) or blood in semen - Erectile dysfunction (in some cases)

Metastatic disease (cancer that has spread to lymph nodes, bones, or other organs): - Bone pain, particularly in the lower back, hips, or pelvis — this is one of the more specific warning signs of advanced prostate cancer - Unexplained weight loss - Fatigue - Leg swelling from lymph node involvement

How do prostate cancer symptoms compare to BPH?

Benign prostatic hyperplasia (BPH) — non-cancerous enlargement of the prostate — is extremely common as men age and produces many of the same urinary symptoms: weak stream, frequency, urgency, and incomplete emptying. BPH grows from the inner zone of the prostate (directly around the urethra), so it compresses the urethra and causes symptoms early, even when small 3Ref 3Lerner LB, McVary KT, Barry MJ, et al. (2021).Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia: AUA Guideline Part I — Initial Work-up and Medical Management.BPH as the predominant cause of lower urinary tract symptoms and coexistence with prostate cancer.

Prostate cancer, by contrast, typically begins in the outer zone, away from the urethra. This is why BPH and prostate cancer can coexist — a man can have bothersome urinary symptoms from BPH and a concurrent prostate cancer that was detectable only by PSA.

Critically, you cannot tell from symptoms alone whether urinary changes are from BPH, cancer, or another cause. A PSA test, rectal exam, and sometimes imaging are needed to distinguish them. If you are experiencing new or worsening urinary symptoms, a urologist can help sort this out 3Ref 3Lerner LB, McVary KT, Barry MJ, et al. (2021).Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia: AUA Guideline Part I — Initial Work-up and Medical Management.BPH as the predominant cause of lower urinary tract symptoms and coexistence with prostate cancer.

Which symptoms should prompt prompt evaluation?

While most urinary symptoms in men over 50 are ultimately due to BPH or another benign cause, these findings warrant evaluation without delay:

• Bone pain in the back, hips, or pelvis, especially if new, persistent, or worsening
• Blood in urine (hematuria) — needs evaluation even if intermittent
• Blood in semen (hematospermia) — usually benign, but warrants assessment if persistent
• Unexplained weight loss alongside urinary symptoms
• Difficulty urinating to the point of retention (unable to urinate at all)

What a urologist looks for in evaluation

A urologist evaluating possible prostate cancer will typically:

1. Review PSA history and trend 2. Perform a digital rectal exam (DRE) to feel for nodules or firmness in the gland 3. Discuss whether imaging (multiparametric MRI) is appropriate before considering biopsy 4. Consider validated symptom scores for BPH (such as the International Prostate Symptom Score) to characterize urinary symptoms

This workup allows the clinician to determine whether a biopsy is warranted and to reassure or treat accordingly 1Ref 1Wei JT, Barocas D, Carlsson S, et al. (2023).Early Detection of Prostate Cancer: AUA/SUO Guideline Part I: Prostate Cancer Screening.Clinical evaluation framework and risk-based screening context2Ref 2US Preventive Services Task Force (2018).Screening for Prostate Cancer: US Preventive Services Task Force Recommendation Statement.Background on asymptomatic early prostate cancer and rationale for PSA screening.

How Gale can help

A Gale primary care clinician can order an initial PSA test, review your symptom history, and help you understand whether a urology referral is appropriate. If your PSA is elevated or your symptoms are concerning, Gale can help coordinate the next step with a urologist.