What is the difference between PVD and PAD? 

The terms peripheral vascular disease (PVD) and peripheral arterial disease (PAD) are often used interchangeably, but they have distinct medical meanings. Understanding the difference between these two conditions is essential for identifying the specific vessels affected and the symptoms you may experience. This article provides a clear explanation of both conditions, their underlying causes, and how healthcare professionals distinguish between them during a clinical assessment. 

What We’ll Discuss in This Article 

• The clinical definitions of peripheral vascular disease and peripheral arterial disease 

• Key differences in how these conditions affect arteries and veins 

• Common symptoms associated with both arterial and venous circulation 

• Statistical data regarding the prevalence of vascular disease in the UK 

• The primary causes and triggers for worsening circulatory issues 

• A detailed comparison table for easy differentiation between PVD and PAD 

What is Peripheral Vascular Disease (PVD)? 

Peripheral vascular disease is a broad, umbrella term that describes any disorder affecting the blood vessels outside of the heart and brain. This includes conditions that impact the arteries, veins, and lymphatic vessels. PVD can cause narrowed or blocked vessels, as well as spasms that restrict blood flow, often leading to pain and skin changes in the legs and arms. 

PVD serves as a general category for various circulatory problems. While it is frequently used to describe arterial issues, it also encompasses venous conditions like deep vein thrombosis (DVT) and varicose veins. In the UK, vascular health is a major focus for the NHS, as circulatory diseases are a leading cause of morbidity. Statistics from the British Heart Foundation suggest that over 7 million people in the UK are living with cardiovascular and circulatory diseases. When a patient is diagnosed with PVD, a doctor must further investigate to see if the issue is organic, meaning caused by structural changes like plaque, or functional, meaning caused by intermittent spasms. 

What is Peripheral Arterial Disease (PAD)? 

Peripheral arterial disease is a specific type of PVD that exclusively affects the arteries, which are the vessels that carry oxygen-rich blood away from the heart to the rest of the body. PAD occurs when these arteries become narrowed or blocked by fatty deposits, a process known as atherosclerosis. This restriction of blood flow most commonly affects the legs and can cause pain during walking. 

PAD is the most common form of PVD. According to NICE guidance, PAD affects approximately 4% of people aged 45 to 50 and up to 20% of people aged over 80 in the UK. Because PAD specifically involves the arterial supply, it is a strong indicator of wider cardiovascular risk, including the risk of heart attack or stroke. The hallmark symptom is intermittent claudication a cramp-like pain in the calves or thighs that occurs during exercise and resolves with rest. Early detection through tests like the Ankle-Brachial Index (ABI) is vital for managing the condition and preventing complications like non-healing ulcers. 

How do PVD and PAD differ? 

The primary difference between PVD and PAD lies in the scope of the vessels involved. PVD is an all-encompassing term for any vessel disorder outside the heart, including veins and lymphatics. In contrast, PAD is a subcategory of PVD that specifically refers to arterial blockages. Therefore, everyone with PAD has PVD, but not everyone with PVD has PAD, as their issue could be venous or lymphatic. 

Physiologically, the symptoms also differ. Arterial issues (PAD) typically result in cold, pale skin and sharp pain during movement. Venous issues (other forms of PVD) often lead to swelling, heavy or aching feelings, and skin that feels warm or looks discoloured. Identifying which system is affected is the first step in clinical management, as the treatments for arterial blockages differ significantly from those for venous insufficiency. 

Causes of Vascular and Arterial Disease 

The most frequent cause of both PAD and many forms of PVD is atherosclerosis, where fatty substances, cholesterol, and calcium build up in the vessel walls to form plaque. Other causes include blood vessel inflammation, known as vasculitis, or physical injury to the limbs. In venous types of PVD, the cause is often weakened valves in the veins that allow blood to pool instead of returning to the heart. 

Atherosclerosis is a progressive condition often linked to high cholesterol and high blood pressure. Chronic conditions like diabetes also play a significant role, as high blood sugar can damage the lining of the blood vessels, making them more susceptible to plaque buildup. In the UK, it is estimated that people with diabetes are two to four times more likely to develop PAD than those without the condition. Understanding these causes helps healthcare teams implement the right preventative measures, such as lipid-lowering medications or blood pressure management. 

Triggers for Worsening Symptoms 

Triggers that can cause PVD and PAD symptoms to worsen include smoking, cold weather, and a sedentary lifestyle. Smoking is the most significant trigger, as it causes immediate narrowing of the blood vessels and speeds up the development of plaque. Exposure to cold temperatures can trigger vasospasm, further restricting blood flow to the extremities and causing pain or numbness. 

Physical exertion acts as a trigger for PAD pain because the narrowed arteries cannot supply enough oxygenated blood to meet the increased demand of the muscles. Conversely, long periods of standing or sitting can trigger symptoms of venous PVD, such as swelling and heaviness, because the blood cannot easily flow upward against gravity. Managing these triggers particularly through smoking cessation and graduated exercise is a primary recommendation in NHS clinical pathways. 

Differentiation: PVD vs PAD Comparison 

To help clarify the differences between the two terms and the conditions they represent, the following table provides a comparison based on clinical characteristics. 

Feature	Peripheral Arterial Disease (PAD)	Peripheral Venous Disease (Venous PVD)
Vessel Type	Arteries only	Veins (usually)
Primary Cause	Atherosclerosis (plaque)	Valve failure or blood clots
Pain Description	Sharp, cramping with exercise	Dull, heavy, aching with standing
Skin Temperature	Cool to the touch	Warm to the touch
Skin Appearance	Pale, shiny, hairless	Reddish-brown, thick, swollen
Pulse	Weak or absent in the foot	Usually normal and present

Conclusion 

While PVD is a general term for all circulatory issues outside the heart and brain, PAD specifically refers to the narrowing of the arteries. Both conditions require careful management to improve blood flow and reduce the risk of further health complications. Recognising the specific symptoms whether they are sharp exercise-related pains or heavy swelling can help in getting the correct clinical support. If you experience severe, sudden, or worsening symptoms, call 999 immediately. 

Authority Snapshot 

This article was reviewed by Dr. Stefan Petrov, a UK-trained physician with an MBBS and extensive experience in general medicine, surgery, and emergency care. Dr. Petrov has worked across hospital wards and intensive care units, performing various diagnostic procedures. This guide provides an evidence-based overview of vascular conditions, ensuring accuracy and public safety according to NHS and NICE guidelines.