Early Symptoms of Peripheral Artery Disease (PAD) in Legs

Peripheral Artery Disease (PAD)

Early Symptoms, Diagnosis, Treatment & Prevention

A patient-friendly guide by RealMedVision

Introduction

I have been seeing patients with leg pain for over a decade now. And I will be honest with you — the number of people who come to me in late stages of this disease, when things have already gotten complicated, is heartbreaking. Not because PAD is difficult to detect. But because the early signs were there for months, sometimes years, and nobody paid attention to them.

Peripheral Artery Disease — or PAD, as we call it - is a condition where the arteries supplying blood to your legs slowly become narrow. The cause is the same enemy we deal with in heart disease: fat and cholesterol quietly building up inside the artery walls, restricting blood flow little by little.

Most people think, "Oh it is just leg cramps, I am getting older." And that is exactly why PAD remains dangerously underdiagnosed worldwide. What makes it worse is that PAD is not just a leg problem. When your leg arteries are blocked, it tells us that similar blockages may already be forming in your heart or brain arteries. In cardiology, we call this systemic atherosclerosis — and it matters a great deal.

This article is my attempt to explain PAD the way I would explain it to a patient sitting in front of me. No unnecessary jargon. No complicated diagrams. Just clear, honest information that you can actually use.

What You Will Learn

By the end of this article, you will understand:

• How PAD develops inside your arteries — and why it happens
• Which populations are most affected globally and in India
• The researchers and institutions that shaped what we know about PAD today
• The early warning signs that most people miss
• How doctors confirm the diagnosis — including a simple 10-minute bedside test
• Which medicines are proven to work and why
• When surgery or a procedure becomes necessary
• How you can actively reduce your risk or slow the disease

Global Epidemiology and Mortality

Let me give you a sense of how widespread this disease really is.

According to the Global Burden of Disease Study published in 2019, more than 230 million people across the world are currently living with PAD. That is more than the entire population of Brazil. And these are only the diagnosed cases. Millions more are walking around with narrowed leg arteries and no idea.

The disease does not affect everyone equally. Prevalence rises sharply after the age of 50, and the burden is heaviest in regions like South Asia, Sub-Saharan Africa, and Eastern Europe — areas where access to early screening and cardiovascular care is often limited.

In India specifically, data discussed in cardiology consensus meetings in 2023 has shown a worrying increase in PAD cases — particularly among urban populations with diabetes. The combination of rapidly changing lifestyles, high rates of smoking, and poorly controlled blood sugar is creating a perfect storm.

Now here is what really concerns me about PAD from a mortality perspective. Most patients do not die from their leg disease. They die from heart attacks and strokes. A major study published in JAMA Cardiology in 2017 showed that patients with PAD carry a two to three times higher risk of having a heart attack or stroke compared to those without the disease. The World Health Organization has long emphasized that atherosclerotic diseases are the leading cause of non-communicable disease deaths worldwide.

This is why we take PAD seriously — not just for the leg, but for the whole body.

Scientific Foundations: Who Shaped Our Understanding?

Medicine is built on the shoulders of researchers who asked the right questions at the right time. Understanding PAD as we know it today would not be possible without a few key figures.

Dr. Peter Libby 

at Harvard Medical School, through his work in the 1990s, fundamentally changed how we think about artery disease. He established that atherosclerosis is not just fat accumulation — it is an inflammatory process. The body's own immune system is involved in building those plaques inside arteries. This insight changed treatment strategies globally.

Dr. Valentin Fuster 

at Mount Sinai contributed extensively to understanding why plaques rupture — which is what triggers sudden heart attacks and strokes. His work in the early 2000s helped explain why some patients with PAD have sudden vascular events even before they develop severe limb symptoms.

Dr. Mark Creager 

at Dartmouth, through his contributions to the 2012 American College of Cardiology statements, helped firmly establish PAD as a systemic vascular disease rather than just a peripheral limb problem. He pushed the cardiology community to treat PAD with the same seriousness as coronary artery disease.

Dr. Alan Hirsch 

at the University of Minnesota developed much of the diagnostic framework we use today. His 2001 work helped define the clinical criteria and screening protocols that are now standard practice.

Dr. Gregory Roth 

at the University of Washington led the Global Burden of Disease 2019 estimates, giving the world its most comprehensive picture of how many people PAD truly affects.

Large-scale research from Johns Hopkins University, the University of Oxford, Harvard, Cambridge, and ETH Zurich has continued to advance our understanding of vascular biology, endothelial function, and plaque behavior — forming the backbone of modern PAD management.

How Peripheral Artery Disease Develops (Pathophysiology)

Let me walk you through what actually happens inside your arteries. I promise this will make sense.

Think of a healthy artery like a smooth, flexible pipe. Its inner lining — called the endothelium — is remarkably thin, just one cell thick, but incredibly important. It keeps blood flowing smoothly and prevents anything from sticking to the walls.

Now, when risk factors like smoking, high blood sugar, high blood pressure, or elevated cholesterol are present over many years, this lining gets damaged. It becomes inflamed. And once inflammation sets in, LDL cholesterol — the bad kind — starts entering the artery wall.

Once inside the wall, LDL gets oxidized. The body sends immune cells to deal with it. These immune cells, called macrophages, swallow the oxidized LDL and become what we call foam cells. Over time, these foam cells accumulate and form what is called a plaque — a fatty, fibrous deposit inside the artery wall.

As plaque grows, the artery becomes narrower. Blood flow decreases. When the narrowing exceeds around 60 percent, blood flow during physical activity becomes insufficient. The muscles in your legs start receiving less oxygen than they need during exercise. This shortage of oxygen triggers symptoms — which is exactly where our next section begins.

Early Symptoms of Peripheral Artery Disease

This is the most important section of this entire article. Please read it carefully.

PAD is deceptive. It develops slowly over years, and its early symptoms are easy to dismiss. People blame aging, tiredness, or muscle weakness — and the opportunity for early treatment is lost. Here is what PAD actually looks like in its early stages.

Intermittent Claudication — The Defining Symptom

The word claudication comes from the Latin word for limping — and that is precisely what this symptom leads to over time.

Patients describe it as a cramping, aching, or heaviness in the calf muscles — sometimes the thighs or buttocks — that appears predictably when they walk, and disappears within a few minutes of rest. Then they walk again, and it comes back. This pattern — pain with walking, relief with rest — is the hallmark of PAD.

Why does this happen? When your leg muscles work during walking, they demand more oxygen. But the narrowed arteries cannot deliver enough blood to meet that demand. The muscles shift to a backup energy process that produces lactic acid as a byproduct. That lactic acid buildup is what creates the pain. When you rest, the demand drops, lactic acid clears, and the pain goes away.

Many of my patients tell me they thought it was just "getting old." I understand. But if your pain follows this precise pattern — walking brings it on, rest relieves it — please do not ignore it.

Cold Foot or Cold Lower Leg

If one of your feet feels consistently colder than the other, that is not a coincidence. It means one side is receiving less blood than the other. This temperature difference is something a doctor can feel with their hands during examination. Patients often notice it themselves, especially at night.

Numbness or Heaviness in the Leg

Some patients describe a dull numbness or a heavy, tired sensation in one leg — not pain exactly, but a sense that the leg is not quite right. This can occur because nerves and muscles are both affected by reduced blood supply. It may come and go, or it may be persistent.

Skin Changes — The Body Tells Its Own Story

Over time, inadequate blood supply changes the appearance of the skin on the legs. These are signs that many patients do not connect to their arteries at all:

• Shiny, tight-looking skin on the lower leg
• Loss of hair on the legs, particularly below the knee
• Skin that appears pale or bluish when the leg is raised
• Skin that turns dusky red when the leg is lowered
• Thickened or slow-growing toenails

These changes happen gradually, which is exactly why they go unnoticed for so long.

Slow-Healing Wounds or Sores on the Feet

This one worries me the most — especially in my diabetic patients. A small cut, a blister, or a minor abrasion on the foot should heal within seven to ten days in a healthy person. In a patient with PAD, blood flow is not sufficient to support the healing process. The wound lingers. It gets infected. And what started as a small sore can become a serious problem.

If you have a wound on your foot that has not healed in two weeks, please see a doctor — do not wait.

An Important Note for Diabetic Patients

I want to be very specific here because this group of patients is at especially high risk. If you have diabetes and have developed nerve damage — what we call diabetic neuropathy — you may not feel the typical leg pain of PAD at all. The nerves that carry pain signals are damaged, so the warning system does not function properly.

This is how PAD silently progresses in diabetic patients until a wound appears, or blood flow becomes critically reduced. If you have diabetes and are above the age of 50, please ask your doctor about PAD screening regardless of whether you have leg pain or not.

Diagnosis of Peripheral Artery Disease

Diagnosing PAD does not always require expensive tests or hospital admission. A good clinical assessment and one simple bedside measurement can tell us a great deal.

Clinical History

The conversation matters enormously. When I sit with a patient, I ask very specific questions: How far can you walk before the pain starts? Which part of the leg hurts? Does it go away with rest? How quickly? Have you noticed any wounds that are slow to heal? Do you smoke or have diabetes?

The answers to these questions already paint a fairly clear picture before any test is done.

Physical Examination

I check the pulse at two specific points on the foot — the dorsalis pedis pulse on the top of the foot, and the posterior tibial pulse at the inner ankle. A weak or absent pulse at either of these points is a significant finding. I also check skin temperature, look for any ulcers, and assess the color of the skin.

Ankle-Brachial Index — The Most Important Test

This is the test I want every patient to know about, because it is simple, painless, and remarkably accurate.

We measure the blood pressure in the arm and then at the ankle using a blood pressure cuff and a small Doppler device. We divide the ankle pressure by the arm pressure. The result is the Ankle-Brachial Index, or ABI.

A normal ABI is between 1.0 and 1.4. An ABI below 0.90 confirms PAD. An ABI below 0.40 means the disease is severe and the limb may be at risk.

This test takes about ten minutes and is recommended by the American College of Cardiology and the American Heart Association as the primary screening tool for PAD.

Doppler Ultrasound

When we need to locate exactly where the narrowing is, and how severe it is, we use a Doppler ultrasound. It shows us blood flow velocity and direction in specific arteries — without any needles or radiation.

Advanced Imaging — CT and MR Angiography

For patients who are being considered for surgical or procedural intervention, we use CT angiography or MR angiography to get a detailed map of the blood vessels. These are typically ordered when more conservative treatments are not working.

Evidence-Based Medical Management

Let me be clear: the goal of treatment is not just to manage leg symptoms. The goal is to protect your heart and brain, slow the disease, and maintain the best possible quality of life. The major international guidelines — including those from the ACC/AHA (2016, updated 2021) and the European Society of Cardiology (2017) — form the basis of everything I am about to describe.

Antiplatelet Therapy — Aspirin or Clopidogrel

Blood thinners in the antiplatelet category — primarily aspirin and clopidogrel — reduce the risk of blood clots forming in the narrowed arteries. They also reduce the risk of heart attacks and strokes. Multiple randomized controlled trials have confirmed their benefit in PAD patients, and these medications are a cornerstone of treatment.

Statin Therapy — For Cholesterol and Much More

Statins are among the most well-studied medicines in all of cardiovascular medicine. In PAD, we recommend high-intensity statins — not just to lower LDL cholesterol, but because statins also stabilize plaques, reduce arterial inflammation, and have been shown in multiple JAMA Cardiology studies and ACC consensus statements to reduce cardiovascular deaths. I tell my patients: this tablet is protecting your heart as much as it is helping your leg.

Blood Pressure Control

The HOPE Trial published in 2000 was a landmark study showing that ACE inhibitors — a class of blood pressure medicines — significantly reduce cardiovascular events in high-risk patients, including those with vascular disease. Keeping blood pressure well controlled is non-negotiable in PAD management.

Diabetes Management

High blood sugar accelerates atherosclerosis. If you have diabetes, controlling your HbA1c — your three-month average blood sugar — is directly linked to how quickly PAD progresses. Some newer diabetes medications also have direct cardiovascular protective effects, which your doctor may consider depending on your specific situation.

Cilostazol — Improving Walking Distance

This medication works specifically to improve blood flow in the legs and has been shown in clinical trials to meaningfully increase the distance patients can walk before pain sets in. It is used for intermittent claudication. However, it is contraindicated in patients with heart failure, so this decision always requires a doctor's evaluation.

Supervised Exercise Therapy

This is a treatment option that patients are often surprised by. Structured, supervised walking exercise — three times per week, progressively increasing — is one of the most effective interventions we have for improving walking distance in PAD. It encourages the growth of small alternative blood vessels around the blockages. It is not always easy in the early weeks, but the benefits are real and well-documented.

When Is Revascularization Needed?

The majority of PAD patients — especially those with mild to moderate disease — can be managed effectively with medicines and lifestyle changes. Surgery or a procedure is not the first step. But there are specific situations where we intervene.

Indications for Intervention

• Claudication that severely limits daily activities despite optimal medical therapy
• Critical limb-threatening ischemia — meaning the leg is not getting enough blood even at rest
• Rest pain — constant pain in the foot even when lying down, often worse at night
• Non-healing ulcers or wounds on the foot
• Gangrene or tissue loss

What the Procedure Involves

The less invasive option is balloon angioplasty — a catheter is guided into the narrowed artery and a small balloon is inflated to open it up. Sometimes a metal stent is placed to keep the artery open. These are done through a small puncture in the groin or wrist, without major surgery, and patients often go home the next day.

When blockages are long or complex, surgical bypass may be needed — creating a detour route for blood to travel around the blocked segment. The decision between angioplasty and bypass depends on the location, length, and nature of the blockage, as well as the patient's overall health. It is always individualized.

Global Mortality and Impact

I think it is worth stepping back and looking at the big picture one more time, because the numbers are sobering.

According to the GBD 2019 data, PAD contributes significantly to global cardiovascular mortality — and the impact is not evenly distributed. Patients in low-resource settings have considerably worse outcomes, not because the disease is inherently different, but because they have less access to early screening, medications, and specialist care.

The regions carrying the highest burden are South Asia and Sub-Saharan Africa. And critically, most deaths in PAD patients are not caused by the leg disease itself — they are caused by heart attacks and strokes, which reflects exactly what I said at the beginning: PAD is a window into the health of your entire cardiovascular system.

In higher-income regions like North America and Western Europe, improved awareness and cardiovascular risk management have helped reduce mortality rates over the past two decades. This shows clearly that outcomes can be changed — when the disease is caught early and treated properly.

Global Distribution Map

Based on the GBD 2019 data and WHO cardiovascular reports, the global distribution of PAD burden looks roughly like this:

High Prevalence Regions

• South Asia — including India, Pakistan, Bangladesh

• Sub-Saharan Africa — driven by limited healthcare access and high smoking rates

• Eastern Europe — where cardiovascular risk factors remain poorly controlled

Moderate Prevalence

• North America — high awareness, but aging population keeps numbers significant

• Western Europe — better managed but still substantial

Lower Reported Prevalence

• East Asia — though underdiagnosis may account for some of this difference

Note: A visual infographic map showing these regions is recommended for web display.

Prevention

Let me be direct: most cases of PAD are preventable. The risk factors are well-known, and addressing them — even partially — makes a significant difference. Here is what actually works:

Stop Smoking

If there is one single thing that matters most, it is this. Smoking is the most powerful modifiable risk factor for PAD. It damages artery walls, accelerates plaque formation, and constricts blood vessels. Quitting smoking — at any age — slows the progression of the disease. If you are still smoking and have PAD, this is the most important conversation to have with your doctor.

Control Your LDL Cholesterol

High LDL is the fuel for plaque formation. Getting it to target levels through diet, exercise, and statins is one of the most evidence-based interventions in cardiovascular medicine. Your doctor will tell you your specific target based on your overall risk.

Keep Your Blood Sugar in Check

For diabetic patients, every percentage point decrease in HbA1c reduces the risk of vascular complications. This is not abstract — it translates directly into slower disease progression and fewer complications.

Exercise Regularly

Walking — yes, even with some discomfort in early PAD — is therapeutic. Aim for at least 30 minutes of walking most days of the week. Supervised exercise programs are available at many cardiac rehabilitation centers. The benefits are well-documented and the cost is essentially zero.

Screen High-Risk Individuals

If you are above the age of 50 and have any combination of smoking history, diabetes, high blood pressure, or high cholesterol — ask your doctor for an ABI test. It is simple, painless, and could catch the disease years before it becomes a serious problem.

Frequently Asked Questions

Is PAD curable?  Not fully, but very manageable. With medicines and lifestyle changes, most patients live normal, active lives.

Does PAD increase heart attack risk?  Yes — 2 to 3 times higher. PAD reflects blockages throughout the body, so we treat the whole cardiovascular system, not just the leg.

Who should get screened?  Anyone above 50 with diabetes, smoking history, high BP, or high cholesterol. Leg pain while walking? Get checked regardless of age.

Is surgery always needed?  No. Most cases are managed with medicines and exercise. Surgery is only for severe cases — critical blockages or non-healing wounds.

Can I exercise with PAD? Yes, and you should. Walking regularly is actually part of the treatment. Start slow, build up, and always check with your doctor first.

Cold foot for weeks — could it be PAD?  Possibly, especially if only one foot is affected. A simple ABI test gives a clear answer in 10 minutes.

About the Author

Iraphan Khan is a Public Health Researcher and Medical Content Writer at RealMedVision. Content is developed with reference to trusted global health sources including WHO, NIH, and peer-reviewed medical literature, and is intended for educational awareness only.

References: Global Burden of Disease Study 2019 | JAMA Cardiology 2017 | ACC/AHA PAD Guidelines 2016 & 2021 | ESC Guidelines 2017 | HOPE Trial 2000 | WHO Cardiovascular Disease Reports