Peripheral artery disease doesn’t happen overnight. It is the result of years — sometimes decades — of damage accumulating inside the arteries of the legs. Understanding what causes that damage is the most powerful tool for prevention. And in many cases, the risk factors driving PAD are ones that can be modified, slowed, or reversed with the right intervention.
What Causes Blocked Leg Arteries?
Blocked leg arteries are caused by atherosclerosis — a process in which fatty plaques build up inside the arterial wall over time. These plaques are composed of cholesterol, calcium, inflammatory cells, and fibrous tissue. As they grow, they progressively narrow the artery, reducing blood flow. Eventually, a plaque can rupture and trigger clot formation, causing sudden complete occlusion.
Atherosclerosis is a systemic disease — it does not affect only the leg arteries. The same process simultaneously affects the coronary arteries (causing heart attacks), the carotid arteries (causing strokes), and the renal arteries. This is why PAD is a marker of whole-body vascular risk, not just a leg problem.
Major Risk Factors for Peripheral Artery Disease
1. Smoking — The Single Most Powerful Risk Factor
Smoking is the most important modifiable risk factor for PAD. Smokers have a 2–4 times higher risk of developing PAD compared to non-smokers. Tobacco toxins damage the endothelium (the inner lining of arteries), accelerate plaque formation, reduce HDL cholesterol, increase blood viscosity, and cause arterial spasm. In India, both cigarette smoking and smokeless tobacco (gutka, beedi) contribute significantly.
Patients who continue to smoke after a PAD diagnosis have dramatically worse outcomes — faster disease progression, higher amputation rates, and reduced benefit from revascularisation procedures. Stopping smoking at any stage reduces risk.
2. Diabetes
Diabetes accelerates atherosclerosis through multiple mechanisms: glycation of arterial wall proteins, oxidative stress, impaired endothelial function, and abnormal lipid metabolism. Diabetic patients develop PAD earlier, more severely, and in smaller, more distal arteries than non-diabetics — making revascularisation technically more challenging.
The combination of PAD and diabetic neuropathy is particularly dangerous: the patient cannot feel the pain of critical ischaemia, so the disease advances undetected until tissue loss occurs.
3. Hypertension (High Blood Pressure)
Sustained high blood pressure damages the arterial endothelium, creating the ideal environment for plaque formation. Hypertension roughly doubles the risk of PAD. In Indian patients, hypertension is extremely prevalent and frequently undertreated, making it a major contributor to the country’s vascular disease burden.
4. High Cholesterol (Dyslipidaemia)
Elevated LDL cholesterol (the ‘bad’ cholesterol) is a primary driver of atherosclerotic plaque formation. Low HDL cholesterol (the ‘good’ cholesterol) removes cholesterol from arterial walls — low levels accelerate plaque build-up. Statin therapy, which lowers LDL, is a cornerstone of PAD management and has been shown to slow disease progression and reduce cardiovascular events.
5. Age
PAD prevalence increases sharply with age. The condition affects approximately 3–5% of people over 50, rising to 15–20% over 70. Ageing causes progressive stiffening of arteries and accumulation of atherosclerotic changes over decades.
6. Obesity and Physical Inactivity
Excess body weight worsens all metabolic risk factors for PAD — blood pressure, cholesterol, blood sugar, and systemic inflammation. Physical inactivity independently increases PAD risk and worsens claudication once PAD is established.
7. Chronic Kidney Disease
Renal impairment is a strong and often underappreciated risk factor for accelerated atherosclerosis. Patients on dialysis have extremely high rates of PAD and peripheral vascular calcification. This overlap is something I see frequently in my practice — the same patient requiring dialysis access work often also has significant leg artery disease.
My Clinical Perspective
In India, the patients I see with the most severe PAD are almost invariably long-term smokers with diabetes — often both. These two risk factors together create an almost perfect environment for rapid, distal atherosclerosis. The tragedy is that both are modifiable. Stopping smoking and achieving good glycaemic control won’t reverse existing arterial disease overnight, but they significantly slow progression and dramatically improve outcomes after revascularisation. If you have both risk factors and you’re over 45, please get your leg pulses checked.
Warning Signs That Leg Artery Blockage May Already Be Present
- Calf cramp or heaviness when walking that relieves with rest
- Cold feet, especially asymmetric (one foot colder than the other)
- Absent foot pulses on clinical examination
- Foot pain at rest or at night
- Non-healing wounds on the feet or toes
⚠️ Important: If you have two or more risk factors for PAD — smoking, diabetes, hypertension, high cholesterol, or age over 55 — ask for an ABI (ankle-brachial index) test. It takes 15 minutes and could detect PAD before symptoms appear.
→ Read more: Peripheral Artery Disease — Full Specialty Page
Frequently Asked Questions
Can PAD run in families?
Yes — there is a genetic component to atherosclerosis risk. A family history of heart attack, stroke, or PAD under the age of 60 should prompt earlier and more vigilant screening in relatives. However, the major risk factors — smoking, diabetes, hypertension, and high cholesterol — are modifiable regardless of genetic background.
Does diet affect the risk of blocked leg arteries?
Yes. A diet high in saturated fat, trans fat, refined carbohydrates, and excess salt raises LDL cholesterol, blood pressure, and blood sugar — all of which accelerate atherosclerosis. A Mediterranean-style diet rich in vegetables, pulses, whole grains, nuts, and healthy fats has the strongest evidence base for reducing cardiovascular and peripheral arterial risk.
Does stress cause PAD?
Chronic psychological stress raises blood pressure, promotes unhealthy behaviours (smoking, poor diet), and increases systemic inflammation — all of which contribute to atherosclerosis. While stress is not a direct cause of PAD, it is a meaningful contributing factor through these pathways.
📖 Related Reading:
- What Is Peripheral Artery Disease? A Vascular Surgeon Explains
- Can Peripheral Artery Disease Be Treated Without Surgery?
- How Dangerous Is Untreated Peripheral Artery Disease?
If you have multiple risk factors for PAD and would like a vascular screening assessment, I see patients at CARE Hospitals, Banjara Hills, Hyderabad.
Dr Rahul Agarwal is a Consultant Vascular & Endovascular Surgeon at CARE Hospitals, Banjara Hills, Hyderabad (MBBS, DNB, DrNB). He treats peripheral artery disease at all stages, from risk factor management to complex endovascular intervention.
Medical Disclaimer: This article is for educational purposes only and does not constitute medical advice. Please consult a qualified medical professional for diagnosis and treatment.