Peripheral Arterial Disease (PAD)

Quick answer

PAD is the narrowing or blockage of arteries that supply your legs and feet — usually from atherosclerosis (the same process that causes heart attacks). The classic symptom is leg pain that comes on with walking and goes away with rest. It’s also a strong marker of cardiovascular disease overall: people with PAD have a much higher risk of heart attacks and strokes.

How to recognize it

PAD presents along a spectrum from no symptoms to limb-threatening:

No symptoms (asymptomatic PAD)

• Plenty of people have PAD without knowing
• May be picked up on screening or after a clinician notes weak foot pulses
• Even asymptomatic PAD signals high cardiovascular risk

Intermittent claudication (the classic symptom)

• Cramping, aching, or fatigue in the calf, thigh, or buttock
• Comes on with walking, predictable distance
• Goes away within minutes of stopping
• Returns at the same distance when you walk again
• Worse going uphill or with faster pace

Critical limb-threatening ischemia (advanced)

• Pain in the foot at rest, especially at night
• Pain relief by hanging the foot over the edge of the bed (gravity helps blood flow)
• Cold, pale, or bluish foot
• Wounds that don’t heal
• Gangrene in late cases
• This stage is a vascular emergency

Other clues on exam

• Diminished or absent foot pulses
• Cool foot compared to the other side
• Hair loss on the lower leg
• Shiny, thin skin
• Slow capillary refill
• Toenail changes (thickening, slow growth)

Why it matters more than just leg symptoms

People with PAD have:

• 3x higher risk of heart attack than the general population
• Higher risk of stroke
• Higher risk of cardiovascular death

PAD is essentially a marker that the same atherosclerotic process is affecting blood vessels throughout the body. Treating PAD is partly about leg symptoms; it’s also about reducing overall cardiovascular risk.

Risk factors

• Smoking — the single biggest modifiable risk factor; raises risk 4x
• Diabetes — both the duration and the control matter
• High blood pressure
• High cholesterol
• Older age — particularly after 65
• Family history of vascular disease
• Chronic kidney disease
• Obesity
• Sedentary lifestyle

Diagnosis

The screening test is the ankle-brachial index (ABI):

• Blood pressure measured at the ankle and arm
• The ratio gives a numeric value
• Normal is around 1.0
• <0.90 suggests PAD
• <0.50 suggests severe disease

Additional testing when indicated:

• Toe-brachial index — for diabetics, where calcified ankle vessels make ABI unreliable
• Treadmill exercise testing — confirms claudication
• Duplex ultrasound — visualizes the arteries
• CT or MR angiography — detailed imaging
• Angiography — gold standard, often combined with intervention

Treatment

The framework: medical therapy for everyone, revascularization for select patients.

Medical therapy (for all PAD patients)

• Smoking cessation — the single most impactful intervention
• Antiplatelet therapy — aspirin or clopidogrel to prevent clots
• Statin — even if cholesterol is “normal,” statins reduce events
• Blood pressure control — typically with ACE inhibitor or ARB
• Diabetes management — tight glucose control
• Cilostazol — specifically for claudication symptoms
• Supervised exercise therapy — surprisingly effective for symptoms; outperforms many medications
• Foot care — daily inspection, properly fitted shoes, prompt attention to wounds

Revascularization (selected patients)

For lifestyle-limiting claudication or critical limb ischemia:

• Angioplasty with or without stenting — opens narrowed arteries via catheter
• Atherectomy — removes plaque
• Bypass surgery — for longer or more complex blockages
• Endarterectomy — removes plaque from the inside of the artery

The choice depends on the location and pattern of disease.

When to see a clinician

Emergency department / 911 if any of the following — these are signs of acute or critical limb-threatening ischemia, a true vascular emergency where time-to-revascularization predicts whether the leg can be saved:

• Sudden severe foot or leg pain with a cold, pale, or blue limb (acute limb ischemia — minutes to hours matter)
• Foot pain at rest, especially at night, in someone with known PAD
• A foot or toe that has turned black, gray, or dusky purple
• Numbness or paralysis that is new and accompanies pain or color change
• A non-healing foot wound in someone with PAD or diabetes plus signs of spreading infection (fever, red streaks, drainage)

Same-day or urgent appointment for:

• A non-healing wound on the foot or leg without signs of severe infection
• Pain at rest that is improving but new
• A foot that is persistently colder than the other side

Standard appointment for:

• Cramping or aching in the calves with walking that consistently resolves with rest (classic claudication)
• New numbness or weakness in the foot without color change
• Anyone over 65 with cardiovascular risk factors — consider screening even without symptoms
• Anyone with diabetes — foot pulses should be checked at least annually

Prevention

The risk factors for PAD are largely the risk factors for cardiovascular disease in general:

• Don’t smoke (or quit if you do)
• Manage diabetes carefully
• Treat high blood pressure
• Maintain healthy cholesterol
• Exercise regularly — walking is particularly protective
• Maintain a healthy weight
• Mediterranean-style or DASH diet
• Annual physicals — including pulse exam in higher-risk patients

Bottom line

PAD is more than a foot problem. It’s a window into your overall cardiovascular health. Treating it well means treating both the leg symptoms and the heart-attack risk that comes with the diagnosis. Smoking cessation, supervised walking, and the right medications make a major difference — and revascularization is reserved for cases where lifestyle changes and medical therapy aren’t enough.