12/15/2025
Breast density isn’t good or bad—but it is important to understand. Each woman’s breast composition is unique.
Every breast contains some combination of fat, glandular, and fibrous tissue—and the proportions can’t be seen without a mammogram.
That’s where breast density comes in.
🧬 It’s mostly genetically predetermined—but things like age, weight changes, medications, and hormone levels can also influence density over time.
Breast density is categorized on a scale from A to D (your BIRADS score):
A = mostly fatty
D = extremely dense
Here’s why that matters:
➡️ Higher density = increased breast cancer risk (independent of family history)
➡️ Mammograms are less sensitive in dense tissue, which means cancer can be harder to detect—this is known as the “masking effect”
But—let’s be clear:
Dense breasts ≠ unhealthy breasts. It’s not a diagnosis, it’s a descriptor.
✨ Most provinces in Canada now include your BIRADS score on your screening mammogram report—but many people don’t know what it means or what to do with that info.
📌 Save this for your next screening. Understanding your density is just one piece of proactive breast health.