Arteriosclerosis, the thickening and stiffening of artery walls, contributes to roughly 19.2 million cardiovascular deaths worldwide each year. Its impact reaches far beyond the heart, affecting the brain, kidneys, and limbs as hardened arteries lose their ability to deliver adequate blood flow throughout the body. The most common form, atherosclerosis, involves the buildup of fatty plaque inside artery walls, but the broader process of arterial stiffening itself causes damage even before significant plaque develops.
How Stiff Arteries Damage the Body
Healthy arteries are flexible. They expand slightly with each heartbeat to absorb the pressure surge, then gently recoil to keep blood moving forward smoothly. When arteries harden, they lose this elasticity. The result is higher blood pressure, greater strain on the heart, and reduced blood flow to organs that depend on a steady supply.
This stiffening process happens gradually over years and decades. Calcium deposits accumulate in artery walls, smooth muscle cells change, and the elastic fibers that give arteries their stretch break down. Because arterial stiffening is systemic, it rarely affects just one part of the body. The severity tends to track across different arterial beds, meaning someone with significant stiffening in their coronary arteries likely has it in their brain and kidney arteries too.
Impact on the Heart
The heart bears the most direct burden. When arteries stiffen, the heart has to pump harder against increased resistance. Over time, this extra workload causes the heart muscle to thicken, which paradoxically makes it less efficient. The combination of a harder-working heart and narrowed coronary arteries from plaque buildup creates the conditions for coronary artery disease, heart attacks, and eventually heart failure.
Plaque buildup narrows the coronary arteries, reducing the blood supply to the heart muscle itself. If a plaque ruptures and a blood clot forms at the site, it can completely block blood flow, causing a heart attack. Even without a dramatic rupture, chronically reduced blood flow starves heart tissue of oxygen, leading to chest pain during exertion and progressive weakening of the heart over years.
Impact on the Brain
Arteriosclerosis in the carotid arteries (the major vessels running up each side of the neck) directly threatens brain health in two ways: stroke and cognitive decline. Calcification in the carotid arteries increases stroke risk by about 43% over a six-year period, based on data from a longitudinal study of over 2,300 middle-aged and elderly adults.
The cognitive effects extend beyond stroke. In animal studies, carotid artery calcification reduced resting blood flow to the brain, disrupted the brain’s ability to regulate its own blood supply, and increased the permeability of the blood-brain barrier in memory-related areas. These changes produced measurable cognitive impairment even without any evidence of bleeding or stroke. Human data supports this: people with larger volumes of carotid calcification had a 37% higher risk of developing dementia over six years, and this association held even after accounting for strokes.
The Framingham Heart Study found that people who had experienced an ischemic stroke were twice as likely to develop dementia as those who hadn’t. So arteriosclerosis creates a compounding problem: it raises stroke risk, and stroke itself dramatically accelerates cognitive decline.
Impact on the Kidneys
The kidneys filter about 45 gallons of blood every day, making them especially vulnerable to arterial damage. When the small arteries supplying the kidneys stiffen and narrow, a condition called nephrosclerosis develops. The filtering units of the kidney, along with the surrounding tissue, gradually deteriorate. This leads to progressive chronic kidney disease, which in turn worsens blood pressure, creating a feedback loop that accelerates both kidney and cardiovascular damage.
Long-standing high blood pressure is the primary driver of this kidney-specific arterial damage, which is why blood pressure management is central to protecting kidney function over time.
Impact on the Legs and Limbs
Peripheral artery disease (PAD) occurs when arteriosclerosis narrows the arteries supplying the legs. The classic symptom is intermittent claudication: cramping or aching in the calves, thighs, or hips that comes on with walking and eases with rest. But only about 10% of people with PAD in the general population experience this classic pattern. Another 45% to 50% of PAD patients in primary care report leg symptoms during exertion that don’t fit the textbook description, while 30% to 60% report no leg symptoms at all.
This means PAD often goes unrecognized. The reassuring news is that severe outcomes are relatively uncommon: over a five-year period, only 1% to 2% of people with PAD progress to critical limb ischemia or require amputation. Still, PAD is a strong signal of widespread arterial disease. Someone diagnosed with PAD has significantly elevated risk for heart attack and stroke, because the same process is almost certainly happening in other arteries.
Connection to Aortic Aneurysms
The aorta, the body’s largest artery, can also be reshaped by arteriosclerosis. When plaque develops inside the aorta, the artery wall tries to compensate by remodeling, expanding outward to maintain normal blood flow despite the narrowing. This compensatory stretching, combined with the breakdown of elastic fibers in the artery wall and chronic inflammation triggered by plaque and blood clots, can lead to excessive weakening and ballooning of the aortic wall. This is an abdominal aortic aneurysm.
Whether atherosclerosis directly causes aneurysms or both conditions simply share the same risk factors (smoking, high blood pressure, aging) remains debated. But the two conditions frequently occur together, and the biological pathways linking plaque development to wall weakening are well documented.
Measuring Arterial Stiffness
Arterial stiffness can be measured by tracking how fast each pulse of blood travels through the arteries. This measurement, called pulse wave velocity, is considered the gold standard for assessing how stiff your arteries have become. In stiffer arteries, the pulse wave travels faster because the walls don’t absorb the energy by stretching.
A pulse wave velocity above 10 meters per second is considered the threshold for increased cardiovascular risk. In a study of patients with coronary artery disease followed for a median of about four years, those above this threshold had up to 90% higher risk of cardiovascular events or death compared to those below it. Pulse wave velocity predicted these outcomes independently of other risk factors like age, blood pressure, and cholesterol.
Slowing and Partially Reversing the Damage
Arterial stiffening is not entirely a one-way street. Aerobic exercise has a measurable “destiffening” effect on arteries. About three months of daily brisk walking improved carotid artery flexibility in previously sedentary middle-aged and older adults, bringing their measurements closer to those of people who had been exercising regularly for years. Cycling and swimming have shown similar benefits, with swimming specifically shown to reduce central artery stiffness in people with high blood pressure.
The 2025 blood pressure guidelines from the American Heart Association and American College of Cardiology recommend a treatment goal of below 130/80 mm Hg for all adults. Medication is recommended when blood pressure reaches 140/90 or above, or at 130/80 for people who already have cardiovascular disease, diabetes, chronic kidney disease, or a predicted 10-year cardiovascular risk of 7.5% or higher. Hitting these targets protects arteries from the ongoing mechanical stress that drives stiffening and wall damage.
Combining strategies appears to amplify the benefits. In one study, postmenopausal women who combined aerobic exercise with a specific fermented milk compound saw reductions in arterial stiffness that were greater than either intervention alone, suggesting that diet and exercise work through complementary pathways. The practical takeaway is straightforward: regular aerobic activity, blood pressure control, and a diet that supports healthy cholesterol levels are the most effective tools for slowing arteriosclerosis and reducing its wide-ranging impact on the body.