🦵 Hypertension & Peripheral Artery Disease: When High BP Affects Your Legs

Most people associate high blood pressure with heart attacks and strokes, but the damage doesn't stop there. The same process that clogs coronary arteries can affect the arteries in your legs and arms, causing peripheral artery disease (PAD). PAD is a common yet under‑diagnosed condition that causes pain when walking, slow‑healing wounds, and in severe cases, gangrene and amputation. Dr. Ravi Sishir Reddy explains how hypertension contributes to PAD, the signs you should never ignore, and how to protect your limbs.

1. What Is Peripheral Artery Disease?

Peripheral artery disease is the narrowing or blockage of arteries that supply blood to the legs (and sometimes the arms). It is almost always caused by atherosclerosis — the buildup of cholesterol‑laden plaques in the vessel wall. When a leg artery is significantly narrowed, the muscles do not receive enough oxygen during activity, leading to pain (claudication). If the blockage becomes severe or a clot forms, the limb can be starved of blood at rest, leading to tissue death (gangrene).

PAD affects approximately 8‑12% of adults over 50, and its prevalence rises sharply with age, smoking, diabetes, and hypertension.

2. How Does Hypertension Cause Peripheral Artery Disease?

Hypertension damages the endothelial lining of all arteries — including those in the legs. The mechanisms are the same as in the heart and brain:

• Atherosclerosis acceleration: High pressure injures the inner lining, allowing LDL cholesterol to infiltrate the wall and form plaques. These plaques narrow the vessel lumen, reducing blood flow.
• Endothelial dysfunction: Hypertension reduces the production of nitric oxide, the molecule that relaxes arteries. This leads to a state of chronic vasoconstriction and impaired blood flow regulation.
• Inflammation and oxidative stress: High BP promotes a cycle of inflammation that destabilises plaques and thickens the arterial wall.

The risk of PAD increases with both the severity and the duration of hypertension. Even prehypertension (elevated BP) is associated with a higher risk compared to normal blood pressure.

3. Symptoms: What Does PAD Feel Like?

The classic symptom is intermittent claudication: cramping, aching, or fatigue in the calf, thigh, or hip muscles that occurs with walking and is relieved within minutes of rest. The pain is predictable — it starts at a certain distance and stops when you stand still. As the disease progresses, that distance becomes shorter.

Other signs and symptoms include:

• Coldness or numbness in the foot or toes, especially compared to the other side.
• Hair loss or shiny skin on the lower leg.
• Slow‑healing wounds or ulcers on the toes, feet, or legs.
• A weak or absent pulse in the foot (detected by a doctor).
• In severe cases (critical limb ischemia): constant pain at rest, gangrene (blackened, dying tissue), and a cold, pale foot.

Many people with PAD have no symptoms at all — or they attribute the leg pain to “getting older” or arthritis. This is why screening is important, especially if you have hypertension and other risk factors.

4. How Is PAD Diagnosed?

The screening test for PAD is the ankle‑brachial index (ABI). It compares the blood pressure at your ankle to the blood pressure in your arm. A normal ABI is 1.0‑1.4. An ABI below 0.9 indicates significant narrowing, and below 0.5 suggests severe disease. The test is simple, non‑invasive, and takes about 10‑15 minutes in a doctor's office.

If the ABI is abnormal or inconclusive, a Doppler ultrasound, CT angiogram, or MR angiogram may be performed to map the location and severity of the blockages.

5. How to Treat and Prevent PAD When You Have Hypertension

The management of PAD and hypertension goes hand in hand — protecting one protects the other. Key strategies include:

• Aggressive blood pressure control: Target below 130/80 mmHg. ACE inhibitors or ARBs are particularly beneficial as they improve endothelial function and walking distance.
• Smoking cessation: This is the single most impactful intervention. Smoking and hypertension synergistically devastate leg arteries.
• Cholesterol management: Statins are recommended for almost all patients with PAD, regardless of baseline cholesterol, as they stabilise plaques and reduce cardiovascular events.
• Antiplatelet therapy: Low‑dose aspirin or clopidogrel reduces the risk of clots forming on narrowed arteries.
• Supervised exercise therapy: Walking programs (30‑45 minutes, at least 3 times a week) can significantly improve pain‑free walking distance by stimulating collateral blood vessel formation.
• Foot care: Inspect your feet daily for cuts, blisters, or sores. Wear well‑fitting shoes. See a podiatrist if you develop any wound that is not healing.
• In severe cases: Angioplasty with a stent, or bypass surgery, may be needed to restore blood flow to the leg and prevent amputation.

Dr. Reddy stresses that leg pain on walking should never be dismissed as just a sign of aging. If you have hypertension and notice cramping in your calves or thighs with exercise, ask your doctor for an ABI test.