Arteriosclerosis, the gradual hardening and stiffening of your arteries, affects nearly every major organ system in the body. It raises blood pressure, forces the heart to work harder, reduces blood flow to the brain and kidneys, and can limit your ability to walk. While many people use “arteriosclerosis” and “atherosclerosis” interchangeably, arteriosclerosis is the broader term for arterial stiffening from any cause, while atherosclerosis, the buildup of fatty plaques inside artery walls, is the most common type.
How Stiff Arteries Change Blood Pressure
Healthy arteries are elastic. When the heart pumps blood, they expand to absorb the pressure, then gently recoil between beats to keep blood moving forward. As arteries stiffen, they lose this ability. The result is a characteristic shift in blood pressure: the top number (systolic) climbs higher because the rigid vessel can’t stretch to accommodate each heartbeat, while the bottom number (diastolic) drops because there’s less elastic recoil pushing blood forward between beats.
This widening gap between the two numbers is called pulse pressure, and it’s one of the earliest measurable signs of arteriosclerosis. A pulse pressure above 60 mmHg is generally considered elevated and signals significant arterial stiffness. The problem compounds itself: at higher pressures, arteries become even less compliant, which drives pulse pressure higher still in a self-reinforcing cycle. Doctors can also measure how fast a pressure wave travels along the aorta. When that speed reaches 10 meters per second or above, the risk of a cardiovascular event like a heart attack or stroke rises roughly 68%, and overall mortality risk increases by about 61%.
The Burden on the Heart
When arteries stiffen, the heart has to push blood against greater resistance with every beat. Over time, the muscular walls of the left ventricle thicken to compensate, a change called concentric remodeling. The chamber walls grow thicker relative to the size of the cavity inside, making the heart muscle denser without necessarily enlarging the overall heart.
This remodeling isn’t harmless. Thicker heart walls are stiffer themselves, which makes the heart less efficient at filling with blood between beats. That impaired filling is the starting point for a type of heart failure where the heart pumps with normal force but can’t relax properly. The mechanism is partly indirect: stiff arteries cause pressure waves to bounce back from the periphery and arrive at the heart late in the pumping cycle, adding extra load at precisely the wrong moment. Research in animal models has confirmed that this late-arriving pressure wave drives wall thickening even when overall blood pressure isn’t particularly high.
Effects on the Brain
The brain depends on a steady, well-regulated blood supply, and arteriosclerosis disrupts that in two ways. First, stiff large arteries transmit higher pulsatile pressure into the smaller vessels of the brain, damaging their delicate walls over time. Second, plaque buildup can directly narrow the arteries feeding the brain, reducing the total volume of blood that reaches it.
The small vessel damage is especially consequential. When tiny arteries deep in the brain become diseased, they can cause silent micro-strokes that destroy patches of white matter, the wiring that connects different brain regions. This pattern of injury leads to a condition called subcortical ischemic vascular dementia. Unlike Alzheimer’s disease, which typically starts with memory problems, this form of cognitive decline first shows up as difficulty with attention, planning, and coordinating movement. Memory trouble comes later.
Larger blockages can cause full-blown strokes, but even without a dramatic event, chronic low-grade reductions in blood flow appear to accelerate cognitive decline with age. Keeping cholesterol and blood pressure under control reduces plaque accumulation in the brain’s arteries and lowers the risk of vascular cognitive impairment.
Kidney Damage and Declining Function
Your kidneys filter roughly 180 liters of blood per day, so they’re particularly vulnerable to vascular disease. Arteriosclerosis in the kidney’s small arteries reduces the blood supply reaching the filtering units, gradually starving them of oxygen. Data from the SMART study showed that even non-obstructive atherosclerosis, meaning plaques that haven’t yet significantly narrowed the artery, accelerates kidney shrinkage and the rise of waste products in the blood over time.
As kidney tissue loses its blood supply, it scars. The kidneys attempt to compensate by growing new tiny blood vessels and rerouting flow, but these makeshift vessels are often tortuous and inefficient. The result is a slow, steady decline in the kidneys’ ability to filter waste. This progression can be slowed with blood pressure management and medications that block the hormonal pathway (the renin-angiotensin system) that tightens blood vessels in the kidney, which has been shown to improve renal blood flow in people with high cholesterol.
Reduced Mobility From Peripheral Artery Disease
When arteriosclerosis affects the arteries supplying the legs, it causes peripheral artery disease (PAD). The classic symptom is intermittent claudication: cramping leg pain that starts with walking and eases with rest. It happens because the narrowed arteries can’t deliver enough oxygen-rich blood to meet the muscles’ demand during activity.
But the functional impact goes beyond pain. People with PAD walk shorter distances, walk more slowly, and are at significantly higher risk of eventually losing the ability to walk for even six minutes continuously. Importantly, not everyone with PAD gets the classic cramping. Many experience atypical symptoms or none at all, yet still show measurable declines in walking ability over time compared to people with healthy leg circulation. Reduced performance on walking tests also predicts higher rates of heart attacks and death, making leg artery disease a marker of broader cardiovascular risk.
The relationship between the degree of artery blockage and how much function someone loses is surprisingly inconsistent. Some people with severe narrowing walk reasonably well, while others with moderate disease struggle. This suggests that muscle conditioning, nerve function, and the body’s ability to grow alternate blood supply routes all play a role alongside the blockage itself.
Vision Loss From Retinal Artery Blockage
The arteries feeding the retina are among the smallest in the body, and arteriosclerosis can set the stage for sudden, painless vision loss. When a clot or piece of fatty debris lodges in a hardened retinal artery, it cuts off blood flow to part or all of the retina. A blockage in the central retinal artery causes sudden blurring or complete loss of vision in one eye. A blockage in a branch artery causes loss of a section of the visual field.
Retinal artery occlusion is treated as an emergency, but the damage is often permanent because retinal cells are highly sensitive to oxygen deprivation. Beyond acute blockages, chronic arteriosclerosis in the eye’s blood vessels can be seen during a routine eye exam, where thickened, shiny arterial walls and characteristic crossing patterns with veins serve as visible evidence of systemic vascular disease happening throughout the body.
What Drives the Damage
Several factors accelerate arteriosclerosis and multiply its impact across organs. High blood pressure is both a cause and a consequence: it damages artery walls, which stiffen in response, which raises blood pressure further. High cholesterol fuels plaque formation inside artery walls. Diabetes damages the inner lining of arteries and promotes both stiffening and plaque growth. Smoking directly injures blood vessels and dramatically accelerates the progression of atherosclerotic disease throughout the body.
Aging itself is a major contributor. Arteries naturally lose elasticity over the decades as the elastic fibers in their walls break down and are replaced by stiffer collagen. This process is universal, but its pace varies enormously depending on lifestyle. Regular aerobic exercise, maintaining a healthy weight, limiting sodium intake, and not smoking can all slow the rate at which arteries stiffen. These same interventions reduce the downstream consequences: lower stroke risk, preserved kidney function, better mobility, and a heart that doesn’t have to work as hard with every beat.