Can claudication affect only one leg? 

Yes, claudication can affect only one leg, and this is actually a very common clinical presentation of Peripheral Vascular Disease (PVD). Although atherosclerosis the buildup of plaque in the arteries is a systemic condition that affects the entire body, it does not always develop at the same rate in every limb. If a significant blockage occurs in the iliac or femoral artery of the right leg but the left leg remains relatively clear, the patient will only experience pain, cramping, or heaviness on that specific side when walking. 

When claudication is ‘unilateral’ (affecting one side), it provides clinicians with a clear physical marker of where the primary arterial narrowing is located. Identifying which leg is affected, and specifically where the pain occurs (calf, thigh, or buttock), helps your healthcare team map the vascular issue before advanced imaging even begins. This article explores why PVD can be asymmetrical, the clinical significance of one-sided leg pain, and how UK specialists assess unilateral symptoms. 

What We’ll Discuss in This Article 

• The biological reasons for asymmetrical plaque buildup. 

• Identifying the location of the blockage based on unilateral pain. 

• The role of dominant limb usage in symptom onset. 

• Clinical triggers for one-sided vascular pain. 

• How ABPI scores differ between the two legs. 

• Differentiation between vascular and orthopaedic one-sided pain. 

• Why unilateral symptoms still require a systemic health review. 

Causes of asymmetrical leg claudication 

While the ‘risk factors’ for PVD, such as high cholesterol and smoking, affect the whole body, the physical formation of plaque is often influenced by local factors. This is known as ‘haemodynamic stress’. Artery branches, curves, and areas where vessels split are more prone to turbulence in the blood flow. This turbulence can cause microscopic damage to the artery lining in one leg more than the other, providing a ‘sticky’ site where plaque accumulates faster. 

Once a significant blockage forms on one side, it creates a self-reinforcing cycle. The restricted flow changes the pressure dynamics in that specific limb, potentially leading to further narrowing. This is why a patient may have a completely normal Ankle Brachial Pressure Index (ABPI) in their left leg but a score of 0.6 in their right leg. In the clinical community, this asymmetry is a vital diagnostic clue that the issue is local to that limb’s arterial ‘tree’ rather than a systemic muscle disorder. 

Identifying the blockage site by pain location 

When claudication affects only one leg, the specific muscle group that hurts tells the doctor exactly where the ‘bottleneck’ is located. Because the pain always occurs downstream from the blockage, the site of the ache is a reliable map of your vascular health. 

Pain Location (One Side)	Likely Site of Arterial Blockage
Buttock or Hip	Aorta or Common Iliac Artery (Pelvis)
Thigh	Common Femoral Artery or Profunda Femoris
Calf	Superficial Femoral Artery (Thigh)
Foot	Popliteal, Tibial, or Peroneal Arteries (Lower Leg)

If you have pain only in your right calf, for example, it suggests that the blockage is likely in the right superficial femoral artery, located mid-thigh. This information is essential for your GP when they are writing a referral to a vascular surgeon, as it allows the specialist to focus their initial Duplex ultrasound on the most relevant section of the leg. 

Triggers for one-sided symptoms 

One-sided claudication is triggered by the same metabolic ‘supply and demand’ failure as bilateral disease, but it is often noticed sooner if one leg is more ‘active’ than the other. 

Activity-Based Triggers 

If you have a dominant leg that you use for pushing off or climbing stairs, that leg may reach its ‘ischaemic threshold’ (the point where it runs out of oxygen) faster than the non-dominant leg. 

Physical Triggers 

Previous injuries to one leg can sometimes lead to localised changes in the blood vessels, making that side more susceptible to symptomatic PVD. 

Environmental Triggers 

Cold weather can cause the arteries to constrict. If one leg already has a 70% blockage, this minor constriction might be enough to trigger pain on that side, while the 30% blockage in the other leg remains asymptomatic. 

Differentiation: Unilateral Vascular vs. Orthopaedic pain 

When pain only affects one leg, it is common to mistake it for a hip, knee, or back issue. However, vascular pain has a very specific ‘recovery’ signature that orthopaedic pain usually lacks. 

Feature	Unilateral Vascular Pain	Unilateral Orthopaedic Pain (e.g., Hip Arthritis)
Trigger	Walking a predictable distance	Specific movements, standing, or weight-bearing
Relief	Standing still (2–5 minutes)	Sitting down or changing posture
Pain Site	Soft muscle tissue (Calf/Buttock)	Usually localized to a joint (Hip/Knee)
Pulse	Often weak or absent on that side	Usually normal
Night Pain	Only in very advanced stages	Common if lying on the affected side

To Summarise 

Claudication can absolutely affect only one leg, and this is typically a sign that plaque buildup has progressed more rapidly in one specific arterial branch. While the pain is localized, the underlying cause is still systemic atherosclerosis, meaning your clinical team will manage your overall cardiovascular health alongside the specific leg issue. One-sided pain is a helpful diagnostic marker that allows for more targeted testing and imaging. If you experience severe, sudden, or worsening symptoms particularly if the affected leg becomes cold, pale, or numb call 999 immediately. 

Authority Snapshot 

This article was reviewed by Doctor Stefan and written by Dr. Rebecca Fernandez, a UK-trained physician with an MBBS and extensive experience in general surgery, cardiology, and internal medicine. Dr. Fernandez has a deep understanding of the asymmetrical nature of vascular disease and how it presents in a clinical setting. This guide follows the MyPatientAdvice 2026 framework and clinical standards for PVD diagnosis and management.