What Peripheral Artery Disease Is
Peripheral artery disease can develop gradually, and many people do not immediately realize their symptoms are related to circulation. The most common early symptom is leg discomfort during walking. However, PAD symptoms can vary widely depending on which arteries are affected and how severe the narrowing has become.
Some people experience clear muscle pain, while others describe fatigue, heaviness, or weakness in the legs during activity. In more advanced cases, circulation may become so limited that symptoms occur even while resting.
Recognizing these symptoms early can help patients receive evaluation and treatment before the disease progresses.
SYMPTOMS & DIAGNOSIS OF PAD
Where Symptoms Occur in the Leg
The location of pain can sometimes provide clues about where circulation is reduced.
Calf pain is the most common symptom and is often associated with narrowing in the femoral or popliteal arteries.
Pain in the thigh or buttock may occur when blockages are located higher in the circulation, such as in the iliac arteries.
Pain in the foot or toes may occur when circulation to the lower leg and foot is severely reduced.
The most common symptom of PAD is intermittent claudication.
This term refers to muscle pain that occurs during walking and improves with rest. The pain is caused by reduced blood flow to the muscles when they need more oxygen during activity.
Patients often describe this sensation as:
• cramping in the calf
• tightness in the muscles
• heaviness in the legs
• fatigue when walking
The discomfort typically begins after walking a predictable distance and improves after stopping for a short period of time.
Intermittent Claudication
Symptoms of Advanced PAD
As PAD becomes more severe, symptoms may occur even when a person is not walking.
These symptoms can include:
• pain in the foot while resting
• pain that worsens at night
• wounds that heal slowly
• colour changes in the toes or foot
• coldness in the foot
These symptoms may indicate severely reduced circulation and should be evaluated by a healthcare professional promptly.
Conditions That Can Mimic PAD
Not all leg pain during walking is caused by circulation problems.
Several other conditions can produce symptoms that resemble PAD.
Spinal Stenosis
Compression of nerves in the lower spine can cause leg pain during walking that improves when sitting or leaning forward.
Peripheral Neuropathy
Nerve damage, often related to diabetes, can cause burning, tingling, or numbness in the feet.
Arthritis
Hip or knee arthritis can cause pain with movement that may be mistaken for circulation-related discomfort.
Doctors evaluate symptoms, perform circulation tests, and examine pulses in the feet to determine whether PAD is present.
When Symptoms Require Urgent Evaluation
Certain symptoms require urgent medical attention.
These include:
• sudden severe pain in the leg
• a wound on the foot that is not healing
• signs of infection in a foot wound
• black or darkened tissue on the toes
• severe pain in the foot while resting
These symptoms may indicate severely reduced circulation and require prompt evaluation by a vascular specialist.
Diagnosis of PAD in the NHS
Many patients first discuss their symptoms with their GP.
If PAD is suspected, the GP may perform a physical examination and evaluate pulses in the feet. They may also order tests that measure circulation in the legs.
Patients may then be referred to a vascular specialist for further evaluation if circulation problems are confirmed.
Ankle-Brachial Index (ABI)
Many patients first discuss their symptoms with their GP.
If PAD is suspected, the GP may perform a physical examination and evaluate pulses in the feet. They may also order tests that measure circulation in the legs.
Patients may then be referred to a vascular specialist for further evaluation if circulation problems are confirmed.
Toe Pressure Testing
In some patients, especially those with diabetes, the ankle-brachial index may be less reliable because arteries can become stiff or calcified.
Toe pressure testing measures blood pressure in the toes and can provide additional information about circulation to the foot.
Duplex Ultrasound
Duplex ultrasound is a non-invasive imaging test that uses sound waves to visualize blood flow in the arteries.
This test can help identify where arteries are narrowed and how severely blood flow is affected.
CT Angiography and MR Angiography
When doctors need detailed images of the arteries, they may use CT angiography or MR angiography.
These imaging tests allow doctors to see the entire circulation in the legs and plan appropriate treatment if procedures are being considered.
What Happens After Diagnosis
Once PAD is diagnosed, treatment typically begins with lifestyle changes, medications, and structured exercise programs.
If symptoms remain severe or circulation is dangerously reduced, vascular specialists may evaluate whether procedures to restore blood flow are appropriate.
The next section of this site explains treatment options for PAD and how doctors determine the most appropriate approach for each patient.