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Two Types of Hardening: Arteriosclerosis vs. Atherosclerosis
When discussing calcium buildup in the arteries, it’s crucial to distinguish between two different conditions. Arteriosclerosis refers to the hardening of artery walls due to calcium deposits embedded within the vessel walls themselves.
While this makes arteries stiffer and less flexible, it doesn’t directly obstruct blood flow. On the other hand, atherosclerosis is a different matter. It involves calcium and other materials accumulating inside the artery—right in the path of blood flow—leading to narrowing, blockages, and potentially serious cardiovascular events.
This article focuses on atherosclerosis, specifically coronary artery calcification (CAC), a process where calcium builds up in the vessels supplying the heart. This is not just a theoretical concern—it can directly affect your risk of heart attack and other cardiovascular conditions.
What Is a Coronary Artery Calcium Score?
Medical professionals developed the Coronary Artery Calcium (CAC) score as a way to detect and quantify this calcification using specialized imaging. Think of it like an X-ray that’s specifically tuned to pick up calcium deposits in the coronary arteries. Because calcium shows up clearly on scans—just as it does in bones—doctors can measure how much calcification is present in each artery feeding the heart.
The CAC score then helps estimate your risk level. If one artery has a little calcium and another has a lot, the score reflects that. The results are typically expressed both as a numerical value and a percentile. For example, if you’re in the 75th percentile, that means 75% of people your age and gender have less calcification than you. A zero score is ideal, while higher scores indicate increased risk.
The Limits of the CAC Score
Despite its usefulness, the CAC score has notable limitations. It primarily detects calcified plaque—what might be called the final stage of the atherosclerotic disease process. But before calcium ever gets involved, atherosclerosis is driven by chronic inflammation, immune activation, and the buildup of soft, fatty plaques in the artery walls.
This means a person can have a CAC score of zero and still be harboring dangerous, non-calcified plaque. In other words, the disease may be progressing silently in its early, inflammatory stage, undetectable by this test. So while a CAC score of zero might feel like an “all clear,” it doesn’t always guarantee your arteries are clean.
Calcium as a Protective Bandage—or a Red Flag
One theory suggests that the body lays down calcium in the arteries to stabilize and “seal off” areas of inflammation—like a protective bandage over a wound. In this view, calcification may actually be the body’s attempt to prevent a rupture or further damage.
But there’s a flip side. If a CAC score is high, it’s a signal that substantial inflammation had to occur first to justify the body’s calcium response. So even though the calcification might be trying to “calm” the vessel, it also tells us that serious immune and inflammatory activity occurred—and possibly continues. That makes high CAC scores strongly associated with worse cardiovascular outcomes.
What Happens When Treatment Makes the Score Go Up?
Here’s a twist that surprises many patients: sometimes, aggressive treatment for heart disease—especially when it reduces inflammation—can actually increase your CAC score. This has been observed in patients treated with statins, as well as those who improve their diet, reduce inflammatory markers like ApoB or lipoprotein(a), or take targeted supplements.
Why would a score go up when health markers are improving? Because the reduction in inflammation can accelerate the body’s process of stabilizing soft plaque with calcium. It’s like finally laying bricks to patch up the damage that was being ignored. In this context, a higher score doesn’t necessarily mean your heart health is worsening—it may actually reflect healing in progress.
But this only applies if the treatment is working. If your CAC score climbs and you’re not taking steps to address inflammation or improve cardiovascular health, then the rising score indicates your risk is growing unchecked.
A Snapshot of a Long Journey
It’s important to understand that the CAC score captures a snapshot of the end of a long disease journey. Atherosclerosis starts with inflamed artery walls, immune cell infiltration, and soft plaques. Only later does calcium get involved. So while the CAC test offers valuable data, it’s only part of the picture.
That’s why clinicians increasingly rely on a broader panel of diagnostic tools. Blood tests for inflammation, lipoprotein particle counts, and imaging technologies that can detect non-calcified plaque are all crucial for a complete risk assessment.
The Bottom Line: Treat the Inflammation, Not Just the Score
Ultimately, coronary artery calcification is just one signal on the heart health dashboard. It’s a useful tool, but not a perfect predictor. A zero score doesn’t mean you’re immune, and a high score doesn’t mean doom—especially if you’re actively addressing root causes like systemic inflammation, poor lipid profiles, and oxidative stress.
This is where collaboration with an integrative or functional cardiologist can be vital. These specialists look beyond numbers and address the deeper metabolic, dietary, and inflammatory factors that drive calcification in the first place.
If you have a high CAC score, don’t panic—but don’t ignore it either. Work with a professional who can help you interpret the score in context and guide you toward treatments that address the real problem: inflammation in your arteries. Because in the end, a heart encased in calcium is a heart crying out for healing—not just from stone, but from fire.
