Your Prostate Health Marker
PSA is a protein produced by prostate cells—ALL prostate cells, not just cancerous ones. It's "prostate-specific," not "cancer-specific." An enlarged prostate (BPH), prostatitis, ejaculation, cycling, and even a digital rectal exam can raise PSA. That said, rising PSA or very high PSA significantly increases the likelihood of prostate cancer and warrants investigation.
What is PSA (Prostate-Specific Antigen)?
PSA is a serine protease produced by prostatic epithelium. It liquefies semen. Normal serum PSA is mostly bound to alpha-1-antichymotrypsin; free PSA is a smaller fraction. Free PSA percentage helps distinguish BPH (higher free %) from cancer (lower free %). PSA velocity (rate of change) and density (PSA/prostate volume) add diagnostic value.
↑ What High PSA (Prostate-Specific Antigen) Means
Something is making your prostate produce more PSA. Could be benign enlargement (BPH, very common after age 50), prostatitis (infection/inflammation), or prostate cancer. PSA >4 ng/mL traditionally triggers further evaluation, but context matters enormously.
Common symptoms:
Often asymptomatic (why screening matters) · BPH symptoms: frequent urination, weak stream, nocturia, incomplete emptying · Advanced cancer: bone pain, weight loss, urinary obstruction
↓ What Low PSA (Prostate-Specific Antigen) Means
Reassuring for prostate cancer risk. Very low PSA (<1 ng/mL) in men over 60 means very low 10-year prostate cancer risk.
Common symptoms:
No symptoms—reassuring
Why It Matters
When normal:
Primary screening tool for prostate cancer
PSA velocity (rising trend) is more informative than single value
Free PSA % helps distinguish BPH from cancer
Very low PSA is very reassuring
Risks if abnormal:
Elevated: could be cancer, BPH, or prostatitis
Overdiagnosis concern: many prostate cancers are indolent
PSA >10: ~50% cancer risk
PSA 4-10 ("gray zone"): ~25% cancer risk
What Can Cause Abnormal Levels?
BPH (Benign Prostatic Hyperplasia)
55% likelyEnlarged prostate produces more PSA. Very common after age 50. BPH elevates PSA 0.3 ng/mL per gram of prostate tissue.
Prostate Cancer
25% likelyCancer cells produce PSA. Higher PSA and rapid PSA rise increase cancer probability.
Prostatitis
Prostatic inflammation or infection can dramatically elevate PSA (sometimes >20).
Recent Ejaculation
Ejaculation can raise PSA for 24-48 hours. Abstain 48h before testing.
Cycling
Prolonged cycling puts pressure on prostate and can mildly elevate PSA.
Age
PSA naturally increases with age as prostate grows.
What You Can Do
Repeat PSA if elevated (confirm before biopsy)
Impact: Transient elevations are common \u00B7 Timeline: 4-6 weeks
Abstain from ejaculation 48h before test
Impact: Eliminates this confound \u00B7 Timeline: Pre-test
Treat prostatitis if present before repeating PSA
Impact: Infection can dramatically raise PSA \u00B7 Timeline: 4-6 weeks after antibiotics
If lifestyle changes aren't enough:
Free PSA percentage if total PSA 4-10 (gray zone)
Impact: Free PSA >25% favors BPH; <10% favors cancer \u00B7 Timeline: With repeat PSA
Track PSA velocity over time
Impact: PSA rise >0.75 ng/mL/year is concerning \u00B7 Timeline: Annual
Lycopene-rich diet (tomatoes, watermelon)
Impact: Associated with lower prostate cancer risk (observational) \u00B7 Timeline: Ongoing
Recommended retest: Screening: every 1-2 years if PSA <2.5; annually if 2.5-4; repeat in 4-6 weeks if elevated
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