Peripheral artery disease (PAD) is narrowing of the arteries outside the heart — most often in the legs — from the same atherosclerosis process that causes coronary artery disease. It's common, under-recognized, and a strong marker of risk for heart attack and stroke, not just a leg problem.
What Is Peripheral Artery Disease?
A narrowing of the arteries that supply blood to the limbs (most commonly the legs), caused by the same buildup of fatty plaque (atherosclerosis) that narrows the coronary arteries in coronary artery disease. Reduced blood flow to the legs can cause pain, poor healing, and, in advanced cases, tissue damage.
What's Happening in Your Body
As plaque builds up inside the leg arteries, blood flow to the muscles decreases — the muscles get enough blood at rest but not enough during activity, which is why the classic symptom is pain specifically with walking that resolves with rest. As disease progresses, blood flow can become insufficient even at rest, threatening the tissue itself.
Types & Causes
- Shares the same major risk factors as coronary artery disease — smoking (a particularly strong driver of PAD specifically), diabetes, high blood pressure, high cholesterol, and age
- Intermittent claudication — the classic pattern of leg pain with walking that resolves with rest, from moderate disease
- Critical limb ischemia — advanced disease with pain at rest, non-healing wounds, or tissue loss, a limb-threatening emergency
- PAD is strongly associated with coronary artery disease and cerebrovascular disease — finding it in the legs is a signal to look carefully at the heart and brain circulation too
Common Symptoms
Leg pain, cramping, or fatigue brought on by walking and relieved by rest (claudication), typically in the calf but sometimes the thigh or buttock depending on which artery is affected. Some people have no symptoms despite significant disease, especially if activity levels are already limited by other conditions. Advanced disease can cause pain at rest, cold feet, poor wound healing, or skin color changes.
How It's Diagnosed
The ankle-brachial index (ABI) — a simple, painless comparison of blood pressure in the ankle versus the arm — is the primary screening and diagnostic test. Ultrasound of the leg arteries adds detail on location and severity, and CT or catheter-based angiography is used when a procedure is being planned. (See Cardiac Testing & Imaging and Procedures & Devices.)
Main Treatment Options
Aggressive risk factor control (smoking cessation is especially high-yield here), a supervised walking/exercise program (proven to meaningfully improve walking distance and symptoms, and often tried before procedures), and antiplatelet therapy to reduce cardiovascular risk broadly (see Antiplatelets). For more severe or limb-threatening disease, catheter-based procedures (angioplasty, stenting) or surgical bypass can restore blood flow — performed by vascular surgery or interventional specialists. (See Procedures I Don't Perform, But May Refer You To.)
Lifestyle Changes That Help
- Smoking cessation — the single most impactful change available for PAD specifically
- A structured walking program, ideally supervised initially, since walking through mild discomfort (safely) is part of how it improves circulation over time
- Diligent foot care — daily inspection, proper-fitting shoes, and prompt attention to any cuts or sores, since healing is compromised with reduced blood flow
- The same heart-healthy diet and risk-factor management used for coronary artery disease (see Coronary Artery Disease)
Living With It
Many people improve substantially with risk factor control and a structured exercise program, without ever needing a procedure. Because PAD signals broader cardiovascular risk, ongoing attention to heart and stroke prevention matters just as much as the leg symptoms themselves — a PAD diagnosis is as much about protecting your heart and brain as it is about your legs.
When to Call Your Doctor vs. Go to the ER
- New or worsening leg pain with walking
- A sore or wound on the foot or leg that isn't healing
- A leg that suddenly becomes cold, pale, painful, and numb — a possible sign of a sudden arterial blockage requiring emergency treatment
- Chest pain or stroke symptoms, given the shared risk with coronary and cerebrovascular disease
Common Questions
Is this the same as varicose veins or poor circulation from standing?
No — PAD is a specific arterial narrowing from atherosclerosis, different from vein-related leg problems, though both can cause leg discomfort; your care team can distinguish between them.
Do I need a procedure right away?
Usually not — a supervised exercise program and risk factor control are the first steps for most people, with procedures reserved for more severe symptoms or limb-threatening disease.
Why is my doctor checking my heart if my problem is my legs?
Because PAD and coronary artery disease share the same underlying process and often occur together — finding disease in one location is a strong reason to evaluate the others.
Does walking through the pain make it worse?
No, quite the opposite for most people — a supervised walking program that includes walking to mild-to-moderate discomfort, resting, and repeating is one of the most effective non-procedural treatments, since it actually stimulates the body to develop small collateral blood vessels over time.
What's the ankle-brachial index (ABI) test my doctor mentioned?
A simple, painless comparison of blood pressure in your ankle versus your arm — a lower ratio than expected suggests reduced blood flow to the leg, and it's typically the first test used to diagnose and grade PAD severity before more detailed imaging is considered.