Men's Health Intelligence
Updated: Jan 2025

Cancer Screening

Colorectal cancer is preventable. Lung cancer screening saves lives in smokers. Skin cancer kills more men than women. Here's what screening is worth doing.

45
age to start colonoscopy
68%
colon cancer reduction
20%
lung cancer mortality cut
1 in 5
Americans get skin cancer

Cancer screening is about finding cancers early—or preventing them entirely. Not all screening is equal. Some (colonoscopy) actually prevents cancer by removing precursors. Some (lung CT) catches cancer early when treatable. Some popular tests (PSA) are more complicated. Here's what the evidence supports.

Colorectal Cancer: Prevention Is Possible

Colonoscopy is unique among cancer screening—it doesn't just find cancer, it prevents it by removing precancerous polyps. The 2021 guideline change lowered starting age from 50 to 45 due to rising rates in younger adults.

Colorectal Cancer Mortality Reduction by Screening Method

Estimated reduction in CRC deaths

Source: USPSTF 2021; Lin et al., JAMA 2016

MethodIntervalProsCons
Colonoscopy10 yearsGold standard; removes polyps; prevents cancerPrep; sedation; rare complications
FIT (stool test)YearlyEasy, no prep, at homePositive requires colonoscopy anyway
Cologuard (DNA+FIT)3 yearsMore sensitive than FIT aloneHigher false positive rate; expensive
CT Colonography5 yearsLess invasive than colonoscopyStill need prep; can't remove polyps

📅 Who Should Screen

  • Average risk: Start at 45, continue to 75
  • Family history: Start at 40 or 10 years before youngest case
  • After 75: Individualize based on health, prior findings
  • Inflammatory bowel disease: Earlier, more frequent

🎯 The Key Point

  • The best screening is the one you'll actually do
  • FIT at home yearly is better than no colonoscopy
  • But colonoscopy is the only method that prevents cancer
  • Don't delay—rates are rising in younger adults
Colonoscopy actually prevents cancer. Unlike most screening (which finds cancer early), colonoscopy finds and removes precancerous polyps before they become cancer. It's prevention, not just early detection.

Lung Cancer Screening

Lung cancer kills more people than any other cancer. For decades, there was no effective screening. Now low-dose CT (LDCT) reduces mortality by 20% in high-risk smokers.

✅ Who Qualifies for Screening

  • Ages 50-80
  • 20+ pack-year smoking history (packs/day × years)
  • Currently smoke OR quit within past 15 years
  • All three criteria must be met
  • Annual low-dose CT scan

⚠️ Considerations

  • High false positive rate: ~25% have abnormal findings
  • Most abnormalities are NOT cancer
  • May lead to additional scans, biopsies, anxiety
  • Radiation exposure (low, but cumulative)
  • Benefits outweigh harms for eligible smokers
Still the most important thing: Quit smoking. Screening reduces mortality by 20%. Quitting reduces it far more. Screening is for those who can't or haven't quit—not a reason to keep smoking.

Skin Cancer Awareness

Men over 50 have the highest mortality from melanoma. They're less likely to notice changes, more likely to have lesions in hard-to-see areas, and often diagnosed later.

Melanoma Mortality by Age and Sex

Deaths per 100,000 population

Source: SEER Database, NCI 2020

🔍 ABCDE of Melanoma

  • A - Asymmetry: One half doesn't match the other
  • B - Border: Irregular, ragged, blurred edges
  • C - Color: Varied shades—brown, black, red, white, blue
  • D - Diameter: >6mm (pencil eraser size)
  • E - Evolving: Changing in size, shape, color

🎯 High-Risk Areas in Men

  • Back: Hard to see; common location
  • Scalp: If balding; often missed
  • Ears: Sun-exposed, often overlooked
  • Have a partner check these areas
  • Annual derm check if many moles or history

✓ Your Cancer Screening Action Plan

✓ Get colonoscopy at 45 (or 40 if family history)
✓ Don't skip or delay—rates rising in younger adults
✓ If smoker/former smoker: ask about lung CT screening
✓ Do monthly skin self-checks (or have partner check back)
✓ See dermatologist annually if high-risk for skin cancer
✓ Know the ABCDE of melanoma
✓ For PSA: see prostate dashboard for nuanced discussion
✓ If family history of any cancer: discuss earlier/enhanced screening

📌 The Bottom Line

Colonoscopy Prevents Cancer

Start at 45. It's the only screening that actually prevents cancer by removing polyps.

Lung Screening for Smokers

Low-dose CT cuts mortality 20% in high-risk smokers. Still quit smoking.

Watch Your Skin

Men have highest melanoma mortality. Check back, scalp, ears. Know ABCDE.

Don't Delay

Early detection saves lives. The best screening is the one you actually get.

Sources & Further Reading