Your legs feel cold, they hurt when you walk, or you have a wound on your foot that just won't heal. Behind those signs may be peripheral artery disease, a condition in which the arteries in the legs narrow and less blood gets through. Here is an overview: what it is, how it shows up, and when it's worth seeing a doctor.
What is peripheral artery disease?
Peripheral artery disease is the narrowing of the arteries that carry blood to the legs, almost always due to atherosclerosis. When less blood arrives, the muscle hurts when you walk and, in advanced stages, wounds that won't heal or night-time pain in the leg while lying down can appear. It is the same process that affects the heart, but located in the legs.
Atherosclerosis is the buildup of cholesterol plaques and other materials in the artery wall. It is not an isolated problem of the foot or the calf: it happens systemically. That's why, when the arteries in the legs are affected, the arteries of your heart and brain may be damaged too. Understanding this helps you see why treatment goes beyond the leg.
First signs worth watching for
Peripheral artery disease progresses slowly and at first gives few clues. Over time, the lack of blood flow shows up in the skin, in the temperature of the foot, and in the way you walk. These are the most common signs:
- Coldness and paleness of one foot or leg compared with the other side.
- Pain when walking in the calf, thigh, or buttock that forces you to stop and fades with rest. This is what's known as intermittent claudication.
- Wounds or ulcers that won't heal on the toes, foot, heel, or ankle.
- Thin, shiny skin, hair loss on the leg, or slow-growing nails.
- In advanced stages, pain at rest, especially at night, which forces you to hang the foot off the bed or sleep sitting up.
Calf pain when walking that eases when you stop is a fairly characteristic clue. We go into it in the guide on leg pain when walking. Even so, not every leg discomfort is peripheral artery disease: that's why a specialist's assessment matters.
Why does it appear? Risk factors
Peripheral artery disease appears when atherosclerosis damages the artery wall. There are factors that speed up that damage. Some cannot be changed, such as age or family history, but most can be controlled, and that's the key to slowing the disease.
- Smoking. It is the most decisive and modifiable risk factor. Quitting smoking is the measure that most changes the outlook.
- Diabetes. Poorly controlled blood sugar damages the arteries and nerves, and makes healing foot wounds harder.
- High blood pressure. Sustained high pressure batters the artery wall.
- High cholesterol. It feeds the buildup of atherosclerosis plaques.
- Chronic kidney disease. It is considered a cardiovascular risk factor in its own right.
Controlling these factors doesn't just protect your legs: it also protects your heart and brain, because the disease is the same throughout the arterial tree.
Peripheral artery disease is a warning about the state of all your arteries. When I treat a leg, I don't just look at the leg: I look at the patient's complete cardiovascular risk. Quitting smoking and controlling cardiovascular risk factors change the outlook more than any technique.
The stages of the disease
Specialists describe peripheral artery disease in stages, according to how much lack of blood flow there is. One of the classic ways to organize them is the Fontaine classification. The disease progresses from less to more, and the sooner you act, the better.
| Stage | What you notice |
|---|---|
| Early | The arteries are already narrowed, but there are still no clear symptoms. |
| Claudication | Pain when walking a certain distance, which eases when you stop. |
| Pain at rest | The leg or foot hurts even when you're not moving, lying down at night, and it disrupts your night's rest. |
| Lesions | Wounds, ulcers, or areas of skin that won't heal appear due to lack of blood flow. |
Moving from one stage to the next is neither inevitable nor does it always happen: with good control of the risk factors, many people stay stable for years. Progression depends on each case.
When to see a doctor and what the specialist can do
It's worth seeing a doctor when you notice recurring pain when walking, coldness or paleness of one leg, or any foot wound that doesn't heal within a couple of weeks, as well as foot pain that disrupts your night's rest. If you have diabetes or you're a smoker, the threshold for booking an appointment should be lower, because the risk is higher.
The specialist in Angiology and Vascular Surgery confirms the diagnosis with an examination of the pulses and a simple, painless test, the ankle-brachial index, which compares the pressure in the ankle with that in the arm. If needed, it is completed with a Doppler ultrasound or other imaging tests.
From there, treatment is tailored to your stage. It usually starts by controlling the risk factors and an exercise program, supported by medication that lowers the risk of adverse cardiovascular events. When blood flow is severely compromised, restoring it is considered: through endovascular techniques via catheterization (for example, angioplasty, stent, or other techniques) or through open surgery with a bypass or other techniques. You'll find the detail on the peripheral arterial disease treatment page.
In summary
Peripheral artery disease is the narrowing of the arteries in the legs due to atherosclerosis, a process that affects your entire arterial tree. Its signs range from coldness and pain when walking to wounds that won't heal. The good news is that it can be controlled: quitting smoking and treating diabetes, blood pressure, and cholesterol slow its progression. If you recognize any of these signs, a timely vascular assessment makes the difference. And faced with a foot that suddenly becomes cold, pale, and very painful, go to the emergency room.