PAD (peripheral artery disease) is one specific type of PVD (peripheral vascular disease), not a separate condition. PVD is the umbrella term covering all diseases of blood vessels outside the heart and brain, including problems with arteries, veins, and lymphatic vessels. PAD refers only to disease in the arteries, almost always caused by a buildup of fatty plaque that narrows or blocks blood flow to the limbs. The two terms are often used interchangeably, which creates confusion, but the distinction matters because they involve different vessels, cause different symptoms, and require different treatments.
How the Two Terms Relate
Think of PVD as a broad category and PAD as one condition within it. PVD includes peripheral artery disease, chronic venous insufficiency, deep vein thrombosis, and disorders of the lymphatic system. When doctors say “PVD,” they could be referring to any of these. When they say “PAD,” they specifically mean narrowed or blocked arteries, usually in the legs.
In practice, many healthcare providers and even medical websites use PVD and PAD as if they mean the same thing. That’s because PAD is by far the most common form of PVD, affecting over 113 million people worldwide as of 2021. Among people 60 and older, roughly 8% currently have PAD, and that number is projected to nearly double by 2050. But grouping all peripheral vascular problems under one label can lead to misunderstanding, especially when venous disease requires a completely different approach.
Different Vessels, Different Problems
PAD affects the arteries, the vessels that carry oxygen-rich blood from your heart to your limbs. The underlying cause is atherosclerosis: fatty deposits gradually build up inside artery walls, narrowing the channel and reducing blood flow. This is the same process that causes heart attacks and strokes, just happening in a different location.
Venous PVD affects the veins, which carry blood back toward the heart. The most common venous condition is chronic venous insufficiency, where the one-way valves inside your veins stop working properly. Blood pools in the lower legs instead of flowing upward, causing swelling and skin changes over time. Deep vein thrombosis, a blood clot forming in a deep vein, is another form of venous PVD.
How Symptoms Differ
The symptoms of PAD and venous disease can both show up in your legs, but they feel different and behave differently with activity.
PAD typically causes cramping, aching, or fatigue in the calves, thighs, or hips during walking or exercise. This is called intermittent claudication: the narrowed arteries can’t deliver enough blood to meet the muscles’ demand, so pain builds with activity and fades within a few minutes of rest. As PAD progresses, you may notice coldness in the lower leg or foot, weak pulses, slow-healing sores, and pale or bluish skin. In advanced cases, pain can occur even at rest, especially at night.
Venous disease produces a heavy, aching sensation in the legs that typically worsens after prolonged standing or sitting and improves when you elevate your legs. You may notice swelling around the ankles, visible varicose veins, skin discoloration (often a brownish tint near the ankles), and in more advanced cases, open sores called venous ulcers. The pain pattern is essentially the opposite of PAD: venous symptoms get worse with inactivity and better with movement or elevation.
Diagnosis
PAD is most commonly diagnosed with an ankle-brachial index (ABI) test, a painless comparison of blood pressure at your ankle versus your arm. A normal ABI falls between 0.9 and 1.4. A score below 0.9 indicates PAD, with values between 0.5 and 0.8 suggesting moderate disease and anything below 0.5 pointing to severe arterial blockage. The test takes about 10 to 15 minutes and can be done in a regular office visit.
Venous disease is diagnosed primarily with duplex ultrasound, which combines standard ultrasound imaging with Doppler technology to visualize blood flow in real time. The technician can see whether blood is moving in the right direction or flowing backward through damaged valves. During the exam, you may be asked to perform specific maneuvers, like bearing down or flexing your foot, so the technician can measure how long blood refluxes in the wrong direction. This is the first-line test for both deep vein thrombosis and chronic venous insufficiency.
Causes and Risk Factors
PAD shares its risk factors with heart disease and stroke. Smoking is the single strongest risk factor, and people with PAD who smoke have shorter life expectancy and a much higher chance of progressing to severe disease. Diabetes, high blood pressure, high cholesterol, and older age all increase risk significantly.
Venous disease has a different risk profile. Prolonged standing or sitting, obesity, pregnancy, a family history of varicose veins, and previous blood clots are the primary drivers. The underlying problem is structural: vein walls lose elasticity, dilate over time, and their internal valves fail. While some risk factors overlap (age, obesity, inactivity), venous disease is not driven by cholesterol or plaque buildup.
Treatment Approaches
Because the underlying mechanisms differ, treatment looks quite different for arterial versus venous disease.
Managing PAD
PAD treatment focuses on slowing atherosclerosis and restoring blood flow. The 2024 guidelines from the American College of Cardiology and American Heart Association recommend antiplatelet therapy (typically a single agent like clopidogrel or aspirin) to reduce the risk of heart attack, stroke, and worsening limb disease. High-intensity cholesterol-lowering medication, blood pressure control, diabetes management, and smoking cessation are all considered essential. Structured walking programs can meaningfully improve how far you can walk before pain starts.
When medications and exercise aren’t enough, a procedure called revascularization can physically reopen the artery. This can be done with a catheter-based approach, where a tiny balloon or stent is threaded into the blocked artery, or with traditional bypass surgery. In the most advanced cases, where tissue has died from lack of blood flow, partial or full amputation of a leg may become necessary. Among people with the most severe stage of PAD (chronic limb-threatening ischemia), the risk of amputation within one year ranges from 25% to 40%.
Managing Venous Disease
Venous disease treatment aims to reduce pooling and support the return of blood toward the heart. Compression stockings are a cornerstone, applying gentle pressure that helps damaged veins move blood more efficiently. Elevating your legs above heart level several times a day, regular exercise, maintaining a healthy weight, and avoiding long periods of standing or sitting all help manage symptoms.
When conservative measures aren’t enough, procedures can close off the damaged veins so blood reroutes through healthier ones. Laser or radiofrequency ablation uses heat delivered through a catheter to seal affected veins shut. Sclerotherapy involves injecting a chemical that scars and closes the vein. These are typically outpatient procedures with relatively quick recovery. Surgical removal of severely damaged veins is reserved for more advanced cases.
Long-Term Risks
The complications of PAD extend well beyond the legs. Because PAD signals widespread atherosclerosis, people with the condition face a significantly elevated risk of heart attack and stroke. The disease in the legs itself can progress to chronic limb-threatening ischemia, where blood flow drops so low that tissue begins to die, leading to gangrene and potential amputation. Smoking dramatically accelerates this progression.
Venous disease carries different long-term concerns. Chronic venous insufficiency can lead to persistent swelling, skin breakdown, and venous ulcers that are slow to heal and prone to infection. Deep vein thrombosis poses the acute danger of pulmonary embolism if a clot breaks free and travels to the lungs. While venous disease significantly affects quality of life, it generally does not carry the same mortality risk as PAD.