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
• <0.40 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.