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Breast/chest cancer screening (screening mammography)

Cancer

Varies by province (e.g., ON/BC: 40–74; QC/MB: 50–74; AB: 45–74)Often every 2 years (some provinces recommend annual in ages 40–49)15–20 minutes

Screening mammography is an X‑ray test that can find breast cancer early, often before it can be felt.

Important Note

If you have symptoms, book diagnostic evaluation rather than relying on routine screening.

Guidance for your location

Location
Country
Select a country only if you want local program matching.
Region-specific program details are not available for this location yet, but you can still use the general profile information.
Recommended Age
Varies by province (e.g., ON/BC: 40–74; QC/MB: 50–74; AB: 45–74)
Frequency
Often every 2 years (some provinces recommend annual in ages 40–49)
Duration
15–20 minutes

Overview

Mammography uses low-dose X-rays to look for changes in breast tissue. In Canada, access and intervals are often organized through provincial screening programs, and the age range varies by province and risk. People with symptoms are typically routed to diagnostic imaging rather than the screening stream. High-risk pathways may include earlier screening and MRI (usually via referral). Dense breast tissue on its own does not automatically mean supplemental ultrasound or MRI should be added after an otherwise negative screening mammogram; that decision is individualized.

Who Should Get This Screening

  • Average-risk adults in the provincial program age range (varies; see Program section above).
  • People without breast symptoms; symptoms (lump, discharge, skin changes) should be assessed diagnostically.
  • High-risk individuals (certain genetic mutations or strong family history) may qualify for earlier or annual screening with MRI (usually requires referral).
  • People with prior breast cancer or breast implants may be directed to diagnostic pathways depending on program rules.

What to Expect

Your breast is placed on a flat plate and gently compressed for a few seconds while X‑ray images are taken (usually 2 views per breast). Compression can be uncomfortable but is brief and helps improve image quality.

How to Prepare

Follow these tips to prepare for your screening

  • Do not wear deodorant, antiperspirant, powder, or lotion on your chest/underarms on the day (can affect images).
  • Wear a two-piece outfit (you’ll undress from the waist up).
  • Tell the booking site if you have symptoms, implants, or prior breast cancer.
  • Bring prior imaging details if you’ve had mammograms elsewhere.

Benefits

  • Can detect cancers earlier, when treatment is often more effective.
  • Program-based access in many provinces.
  • Provides a structured pathway for follow-up if an abnormality is found.

Things to Consider

  • Low-dose radiation exposure.
  • False positives can lead to additional imaging or biopsy.
  • False negatives can occur (no test detects every cancer).
  • Overdiagnosis of some slow-growing cancers is possible.
  • Having dense breasts does not automatically mean supplemental ultrasound or MRI will help; evidence for routine extra imaging after a negative mammogram is still uncertain.

Guideline Source: Provincial breast screening programs (Canada) (see Program section above)

This information is provided for educational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for personalized recommendations.