Vascular disease in the legs refers to any condition that damages or disrupts blood flow through the blood vessels of your lower limbs. It most commonly takes two forms: peripheral artery disease (PAD), where arteries carrying blood to your legs become narrowed or blocked, and chronic venous insufficiency (CVI), where veins struggle to return blood back to your heart. About 8% of adults over 60 currently have PAD, and that number is expected to nearly double in the coming decades.
How Arterial Disease Develops
The most common type of vascular disease in the legs is peripheral artery disease. It happens when fatty deposits, cholesterol, and other substances build up inside artery walls, forming a substance called plaque. Over time, this plaque narrows the arteries and restricts blood flow. If a piece of plaque ruptures, a blood clot can form on top of it, narrowing the artery even further or blocking it entirely.
The result is straightforward: your leg muscles don’t get enough oxygen-rich blood to meet their demands. When you’re sitting still, the reduced flow may be enough to get by. But when you start walking, climbing stairs, or doing anything that makes your muscles work harder, the supply can’t keep up. That gap between what your muscles need and what they receive is what produces symptoms.
How Venous Disease Develops
Chronic venous insufficiency works in the opposite direction. Instead of a problem getting blood to your legs, it’s a problem getting blood back out. Veins contain one-way valves that keep blood moving upward toward your heart. When those valves weaken, stretch, or get damaged, blood flows backward and pools in the lower legs. This creates sustained high pressure in the veins, which over time damages the surrounding tissue.
The most common cause of valve failure is simply weakened or abnormally shaped valves, sometimes combined with veins that have widened enough that the valve flaps no longer meet. A history of deep vein thrombosis (blood clots in the deep leg veins) is another major cause. The clot triggers inflammation that scars the valves and narrows the vein’s interior, setting the stage for chronic insufficiency even after the clot itself resolves.
What Arterial Disease Feels Like
The hallmark symptom of PAD is called claudication: muscle pain or cramping that starts during activity and stops with rest. It most often hits the calf, but it can also affect the thigh, buttock, or foot. The pain typically appears after walking a certain distance or at a certain pace, and it reliably fades within a few minutes of standing still. Many people describe it as a deep ache, heaviness, or tiredness in the muscle rather than a sharp pain.
As the disease progresses, the walking distance that triggers pain gets shorter. Eventually, pain can occur at rest, particularly at night when you’re lying down. Other changes develop gradually and are easy to overlook: the skin on your legs may become shiny, hair growth may slow or stop, toenails may grow more slowly, and the skin may change color. Sores on the toes, feet, or lower legs that refuse to heal are a serious warning sign that blood flow has become critically low.
When blood flow drops to dangerously low levels, the condition is called critical limb ischemia. This involves persistent rest pain (especially in the feet), non-healing wounds, or tissue death. Symptoms are typically present for at least two weeks. This stage carries a real risk of amputation if blood flow isn’t restored.
What Venous Disease Feels Like
Venous insufficiency tends to announce itself differently. Early on, you may notice swelling in one or both lower legs that improves when you elevate your feet. The legs often feel heavy, achy, tired, or itchy, especially after prolonged standing. These symptoms can be easy to dismiss as normal fatigue.
As the condition advances, more visible changes appear. Varicose veins become prominent. The skin around the ankles, particularly the inner ankle, may darken to a brownish color as red blood cells leak out of swollen veins and leave iron deposits in the tissue. The skin can thicken and harden, a condition caused by scarring in the fat layer beneath the skin. In the most advanced stages, the weakened skin breaks down into open ulcers, most commonly over the inner ankle bone. These venous ulcers can be difficult to heal and tend to recur.
Who Is Most at Risk
Smoking and diabetes are the two strongest risk factors for peripheral artery disease. In national survey data, smoking increased the odds of PAD by 4.5 times, and diabetes increased the odds by 2.7 times. People with diabetes have more than double the prevalence of PAD compared to the general population, and they face higher rates of amputation, longer hospital stays, and greater mortality when PAD does develop.
Diabetes accelerates vascular damage through several overlapping mechanisms. Chronically elevated blood sugar damages the inner lining of arteries, triggers inflammation, promotes clot formation, and reduces the body’s ability to produce substances that keep blood vessels relaxed and open. At the same time, it makes platelets stickier and impairs the body’s natural clot-dissolving system. The combination creates an environment where plaque builds faster and complications happen sooner.
Other significant risk factors include high blood pressure, high cholesterol, reduced kidney function, and age. Among people 65 and older, projected PAD rates reach nearly 22% in women and about 15% in men. For venous insufficiency, risk factors include a history of blood clots, obesity, prolonged standing, pregnancy, and a family history of vein problems.
How It’s Diagnosed
The primary screening tool for arterial disease in the legs is the ankle-brachial index, or ABI. It compares blood pressure measured at your ankle to blood pressure measured at your arm. The test is painless, takes a few minutes, and provides a ratio that indicates how well blood is flowing to your legs.
- 1.0 to 1.4: Normal blood flow
- 0.9 to 1.0: Acceptable, no action needed
- 0.8 to 0.9: Mild arterial disease
- 0.5 to 0.8: Moderate arterial disease
- Below 0.5: Severe arterial disease
- Above 1.4: Suggests hardened arteries that don’t compress normally, requiring further evaluation
A score below 0.9 is considered diagnostic of PAD. Venous insufficiency is typically diagnosed through ultrasound imaging that can visualize blood flowing backward through faulty valves and identify which veins are affected.
Treatment for Arterial Disease
For PAD with claudication symptoms, the recommended first-line treatment is a supervised exercise program. This typically involves walking on a treadmill three times per week, 30 to 60 minutes per session, for at least 12 weeks. The protocol is specific: you walk until you approach your maximum claudication pain, rest until it subsides, then walk again. Over time, this progressively extends the distance you can cover before pain sets in. Both the American College of Cardiology and the Society for Vascular Surgery recommend this as the starting point for most patients with symptoms.
Medications play a supporting role. Antiplatelet drugs like aspirin or clopidogrel help prevent clots from forming and reduce the risk of heart attack or stroke, since the same plaque-building process that narrows leg arteries often affects the heart and brain. Statins slow plaque progression and lower the risk of PAD complications. One specific medication, cilostazol, can improve walking distance by helping blood flow more easily, though it can cause headaches, diarrhea, or dizziness.
When the disease is more severe, procedures to physically restore blood flow become necessary. Angioplasty involves threading a small balloon into the narrowed artery and inflating it to push the plaque aside, often followed by placing a mesh tube called a stent to hold the artery open. Bypass surgery creates an entirely new path around a blocked section of artery using either a vein from elsewhere in your body or an artificial vessel. Bypass is typically reserved for cases where angioplasty is unlikely to succeed, or when the goal is to save a leg threatened by critical ischemia.
Treatment for Venous Disease
Venous insufficiency treatment starts with compression therapy. Graduated compression stockings squeeze the legs most tightly at the ankle and gradually less higher up, helping push blood back toward the heart and reducing the pooling that causes symptoms. Regular leg elevation, exercise, and weight management also help reduce venous pressure.
For veins with failed valves, several procedures can close or remove the damaged vessels and redirect blood through healthier veins. These range from minimally invasive options that use heat or chemical solutions to seal veins shut, to surgical removal of larger varicose veins. Venous ulcers require specialized wound care alongside compression to heal and prevent recurrence.
Why Leg Vascular Disease Matters Beyond the Legs
PAD is not just a leg problem. The same atherosclerosis that narrows leg arteries is almost certainly affecting arteries elsewhere, including those feeding the heart and brain. People diagnosed with PAD have a significantly elevated risk of heart attack and stroke. That’s why treatment includes system-wide measures like cholesterol-lowering medication and blood pressure control, not just interventions targeted at the legs. Recognizing vascular disease in the legs early often provides the first opportunity to address cardiovascular risk before a more dangerous event occurs.