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Health condition · Clinically reviewed

Arterial blockages, from atherosclerosis to acute occlusion.

One disease process, many organs. A patient guide to how narrowed and blocked arteries are recognised, investigated and treated across every vascular bed.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, ESC, ESVS and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK vascular and cardiovascular practice, including endovascular and MDT-led care.

Key facts

Arterial blockages at a glance.

The essentials in plain English - what it is, what causes it, where it happens and how it is treated in the UK today.

  • What it is

    Any narrowing or obstruction of an artery, reducing blood flow to the tissue it supplies. Can be chronic (atherosclerosis) or acute (thrombosis, embolism, dissection).

  • Main mechanism

    Atherosclerosis is the dominant cause worldwide, driven by cholesterol, hypertension, diabetes, smoking and inflammation.

  • Where it strikes

    Coronary, cerebral, carotid, vertebral, renal, mesenteric and lower limb arteries. Each site has its own syndrome and specialist team.

  • Acute vs chronic

    Chronic disease causes claudication, angina and TIAs. Acute occlusion causes MI, stroke, mesenteric ischaemia or a pale, painful limb.

  • Foundation therapy

    Antiplatelet, statin, ACE inhibitor, blood pressure and glycaemic control, smoking cessation - together they change trajectory.

  • When to intervene

    Endovascular (angioplasty, stent) or open surgical bypass and endarterectomy for critical, symptomatic or life-threatening disease.

Why this guide matters

One disease, many organs, one plan.

Whether the blockage is in the heart, brain, gut or leg, the mechanisms and risk factors overlap. The three principles below shape everything else on this page.

  • Atherosclerosis is systemic

    Disease in one vascular bed almost always means silent disease in others - treat the whole patient, not one artery.

  • Acute occlusion is time-critical

    Heart, brain, gut and limb all follow the same rule - minutes and hours change outcomes. Know the red flags.

  • Medical therapy is the foundation

    Statins, antiplatelets, blood pressure control and stopping smoking change prognosis more than any single procedure.

Mechanisms

How an artery becomes blocked.

Eight distinct processes, sometimes overlapping. Naming the mechanism guides every step of treatment.

  • Atherosclerosis

    The commonest cause - chronic cholesterol plaque, endothelial dysfunction and progressive luminal narrowing over years.

  • Thrombosis

    An acute clot forming on a ruptured atherosclerotic plaque, or de novo in a hypercoagulable state.

  • Embolism

    Clot travelling from the heart (AF, mural thrombus after MI, endocarditis, myxoma, mechanical valve, PFO) or the aorta.

  • Dissection

    A tear in the arterial wall - aortic, carotid or vertebral - obstructs flow and can propagate.

  • Vasculitis

    Inflammation of the vessel wall - giant cell arteritis, Takayasu, polyarteritis nodosa and ANCA-associated disease.

  • Fibromuscular dysplasia

    Non-inflammatory beading of renal or carotid arteries, classically in young women.

  • Connective tissue disease

    Vascular Ehlers-Danlos and Marfan predispose to aneurysm, dissection and premature arterial disease.

  • Hypercoagulable states

    Antiphospholipid syndrome, protein C/S or antithrombin deficiency, factor V Leiden and malignancy-related thrombophilia.

Sites and syndromes

Where blockages happen, and what they cause.

The same underlying disease presents completely differently depending on which vascular bed is affected. Each has its own dedicated pathway.

See also our dedicated guide to critical limb ischaemia for advanced lower limb disease.

How the diagnosis is made

From first symptoms to a clear plan.

The steps a UK GP, cardiologist, stroke physician or vascular surgeon will normally follow - so you know what to expect and why.

  1. 01

    Assessing

    History and risk profile

    Pattern of pain, exertional triggers, walking distance, TIA symptoms and full cardiovascular risk assessment.

  2. 02

    Assessing

    Focused vascular examination

    Pulses at every level, bruits over the carotids and abdomen, ABPI at the ankle and capillary refill.

  3. 03

    Assessing

    Baseline bloods and ECG

    Lipids, HbA1c, renal function, FBC and a 12-lead ECG. AF or prior MI point to an embolic source.

  4. 04

    Confirming

    Duplex ultrasound

    First-line imaging for carotid, renal, mesenteric and lower limb arteries. Non-invasive and repeatable.

  5. 05

    Confirming

    CT or MR angiography

    CTA and MRA map the whole arterial tree - the workhorse before endovascular or surgical planning.

  6. 06

    Confirming

    Cardiac source workup

    Echocardiogram, prolonged ECG monitoring and, in selected cases, TOE to look for AF, mural thrombus, vegetation or PFO.

  7. 07

    Planning

    Catheter angiography and MDT

    Diagnostic and therapeutic in the same sitting. Complex disease is planned by a vascular, cardiac, stroke or neurosurgery MDT.

Typical timeline: urgent for acute presentations, days to weeks for chronic disease workup.

Symptoms

What arterial blockages actually feel like.

Symptoms depend on which artery is affected and how quickly it closes. The features below cover the classic presentations and the emergencies.

  • Intermittent claudication

    Calf, thigh or buttock ache on walking, relieved by rest. The classic lower limb symptom of peripheral arterial disease.

  • Angina and chest pain

    Central, pressing chest discomfort on exertion pointing to coronary artery narrowing. Rest angina is a red flag for ACS.

  • TIA and stroke symptoms

    Sudden face, arm or speech disturbance. Amaurosis fugax (transient visual loss) suggests carotid disease.

  • Critical limb ischaemia

    Rest pain, tissue loss or gangrene. A limb-threatening emergency needing urgent vascular review.

  • Mesenteric angina

    Post-prandial abdominal pain, weight loss and food fear. Acute mesenteric ischaemia is a surgical emergency.

  • Renovascular hypertension

    Resistant high blood pressure, flash pulmonary oedema or unexplained renal decline in an at-risk patient.

  • Subclavian steal

    Arm claudication, dizziness or drop attacks triggered by arm use. Suggests proximal subclavian narrowing.

  • Red flag - acute limb ischaemia

    The six Ps: pain, pallor, pulseless, paraesthesia, paralysis, perishing cold. Call 999 and get to vascular surgery.

Treatment

How arterial blockages are treated in the UK.

Risk factor optimisation and medical therapy first, then endovascular or open surgery for critical, symptomatic or life-threatening disease. All planned by a specialist MDT.

  • Risk factor optimisation

    Blood pressure, lipids, glycaemic control, weight and smoking cessation - lifelong and non-negotiable, whatever else is done.

  • Antiplatelet and statin

    Clopidogrel or aspirin and a high-intensity statin form the medical backbone. Adjusted for bleeding risk.

  • ACE inhibitor and BP control

    Reduces cardiovascular events across every arterial bed. Titrated with renal function monitoring.

  • Supervised exercise therapy

    The best-evidenced first-line treatment for claudication - can double walking distance over 12 weeks.

  • Angioplasty and stenting

    Endovascular treatment for coronary, carotid, renal, mesenteric and lower limb disease. Day-case in many centres.

  • Endarterectomy and bypass

    Open surgical options for critical carotid, aorto-iliac or infrainguinal disease when endovascular is not enough.

  • Thrombolysis or thrombectomy

    Acute stroke, acute limb ischaemia and acute mesenteric ischaemia - time-critical, protocol-driven care.

  • Anticoagulation when needed

    For cardiac embolic source (AF, mural thrombus, mechanical valve) or hypercoagulable state. Not routine in atheroma.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP, cardiologist, stroke physician or vascular surgeon knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE. Peripheral arterial disease: diagnosis and management (CG147).

  • NICE. Cardiovascular disease: risk assessment and reduction (NG238).

  • European Society of Cardiology (ESC). Guidelines on peripheral arterial and aortic diseases.

  • European Society for Vascular Surgery (ESVS). Clinical practice guidelines.

  • Royal College of Physicians. National clinical guideline for stroke.

Red flags

When arterial disease is an emergency.

Chronic arterial disease is manageable. Acute occlusion is not - these are the situations where you dial 999.

  • Acute limb ischaemia

    A pale, painful, pulseless, cold limb with sensory or motor loss. Time is tissue - vascular surgery within hours.

  • Acute chest pain at rest

    Prolonged central chest pain, breathlessness or sweating - treat as acute coronary syndrome and call 999.

  • Sudden focal neurology

    FAST signs (face, arm, speech, time) - dial 999 for a thrombolysis or thrombectomy assessment.

  • Severe abdominal pain out of keeping

    Especially with AF, recent MI or vasculopathy. Consider acute mesenteric ischaemia - a surgical emergency.

  • Tearing chest or back pain

    Aortic dissection can occlude any branch artery. Immediate CT aorta and cardiothoracic input.

  • New severe hypertension in a young person

    Think fibromuscular dysplasia, coarctation or renovascular disease - refer for specialist workup.

  • Ischaemic rest pain or tissue loss

    Night pain relieved by hanging the foot down, ulcers or gangrene - critical limb ischaemia deserves urgent referral.

  • Transient monocular blindness

    Amaurosis fugax points to carotid disease and needs urgent carotid duplex and stroke pathway input.

  • Systemic vasculitis features

    Fever, weight loss, jaw claudication, temporal tenderness or new headaches over 50 - consider giant cell arteritis.

Living with it

A treatable condition, with a clear ladder.

Four things that make the biggest difference day to day - moving, taking your medicines, stopping smoking and knowing when to act.

A quiet reminder

Small habits over years beat any single procedure.

A statin taken every night for a decade does more than any stent - the trick is keeping going.

  1. 01 Walk

    Walk through the pain

    For claudication, supervised walking that pushes into discomfort is the treatment - not the enemy. Build up over 12 weeks.

  2. 02 Meds

    Take the boring pills

    Statins, antiplatelets and blood pressure tablets do the invisible work. Missed doses matter more than any single intervention.

  3. 03 Smoke

    Stopping smoking is the single biggest lever

    Every vascular outcome improves - graft patency, wound healing, limb salvage and life expectancy. UK smoking cessation services are free.

  4. 04 Escalate

    Know your red flags

    New rest pain, a cold limb, sudden weakness or crushing chest pain means 999, not a GP appointment.

Frequently asked

Everything we get asked about arterial blockages.

Quick answers on causes, diagnosis, whether blockages can be reversed, angioplasty versus bypass and when to call 999.

  • What causes arterial blockages?

    Most are caused by atherosclerosis - cholesterol-rich plaque building up inside artery walls over decades, driven by high blood pressure, high cholesterol, diabetes, smoking and inflammation. Other causes include acute clot (thrombosis), emboli from the heart or aorta, arterial dissection, vasculitis and rarer conditions like fibromuscular dysplasia.

  • Are arterial blockages the same as heart disease?

    Coronary artery disease is one part of it. The same underlying process can affect the brain (stroke, TIA), neck (carotid stenosis), abdomen (renal, mesenteric) and legs (peripheral arterial disease). Having disease in one bed strongly predicts disease elsewhere.

  • How are arterial blockages diagnosed?

    A combination of clinical assessment, ankle-brachial pressure index (ABPI), duplex ultrasound, CT or MR angiography and sometimes catheter angiography. Cardiac imaging and ECG monitoring add information when an embolic source is suspected.

  • Can arterial blockages be reversed?

    Plaque cannot be fully removed but growth can be halted and, with intensive statin and lifestyle therapy, small amounts of regression are possible. Symptoms often improve markedly with medical therapy, exercise and, where indicated, angioplasty, stenting or surgery.

  • What is the difference between angioplasty and bypass surgery?

    Angioplasty uses a balloon (usually with a stent) inside the artery to widen the narrowing. Bypass surgery routes blood around the blockage using a vein or synthetic graft. The choice depends on the site, length and complexity of the disease and is made by a vascular or cardiac MDT.

  • When is an arterial blockage an emergency?

    Sudden severe chest pain, sudden face, arm or speech weakness, a pale, painful, cold limb or severe abdominal pain out of proportion to examination all suggest acute occlusion. Call 999 - hours matter for heart, brain, gut and limb.

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