Health condition · Clinically reviewed
Angina, stable and unstable — plainly explained.
Chest pain due to reduced blood flow to the heart muscle — stable angina is predictable, unstable is an emergency. Here is how to tell them apart, and the modern investigation and treatment pathway.
Why trust this guide
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Clinically reviewed
Written by our editorial team and reviewed by a registered UK clinician before publication.
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Sourced, not summarised
Every claim is checked against NICE, ESC or a peer-reviewed source you can see at the end.
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Updated for 2026
Reflects current UK guidance on CTCA-first investigation and the modern treatment ladder.
Key facts
Angina at a glance.
The essentials, in plain English — what it is, how it presents, how it is investigated, and how it is treated in the UK today.
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What it is
Chest pain caused by reduced blood flow to the heart muscle (myocardial ischaemia) without infarction.
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Stable vs unstable
Stable angina is predictable and provoked by exertion. Unstable angina is new, worsening or at rest — a medical emergency.
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Classic pattern
Central chest tightness on exertion or emotion, relieved within minutes by rest or GTN spray.
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Atypical presentations
Women and people with diabetes often present with breathlessness, fatigue or jaw and back discomfort rather than classic pain.
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How it is investigated
Non-invasive first — resting ECG then CT coronary angiogram (CTCA) as NICE first-line imaging.
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Fast symptom relief
Glyceryl trinitrate (GTN) spray under the tongue relieves symptoms within minutes and is a diagnostic clue in itself.
Why this guide matters
Small signals, very big decisions.
Angina sits between a warning and an emergency. Reading the pattern correctly changes what happens next — and what your future risk looks like.
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Pattern beats intensity
How and when the pain comes on matters more than how bad it feels in the moment.
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Non-invasive first, always
CTCA has replaced exercise ECG as the NICE first-line test for most people with chest pain.
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Unstable angina is a 999 call
New pain, pain at rest, or rapidly worsening symptoms need emergency assessment today.
How the diagnosis is made
From first symptom to a clear plan.
The steps a UK GP and cardiology team will normally follow, in order — so you know what to expect and why.
Phase 1 · Recognising
History and resting or stress ECG
Phase 2 · Imaging
CTCA and calcium score to map the arteries
Phase 3 · Managing
Cardiology plan and treatment
- 01
Recognising
Symptom pattern history
Character, triggers, duration and relief pattern — the story often makes the diagnosis.
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Recognising
Resting ECG
A baseline 12-lead ECG to look for prior infarction or rhythm changes.
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Recognising
Exercise ECG or stress imaging
Reproducing symptoms under controlled exertion, sometimes with stress echo or perfusion imaging.
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Imaging
CT coronary angiogram (CTCA)
NICE first-line non-invasive test for people with typical or atypical anginal chest pain.
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Imaging
Coronary calcium score
Quantifies calcified plaque burden and refines cardiovascular risk.
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Managing
Invasive angiography if needed
Reserved for high-risk findings or when revascularisation is being considered.
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Managing
Cardiology consultation
A management plan combining lifestyle, medication and — where indicated — PCI or CABG.
Typical timeline: 2–6 weeks from first assessment to a settled plan.
Symptoms
What angina actually feels like.
A classic pattern — and the atypical presentations that catch people out. Here is what to look for and when to seek urgent care.
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Central chest pain or tightness
A pressure, squeezing or heaviness behind the breastbone — rarely sharp or stabbing.
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On exertion or emotion
Provoked by walking uphill, climbing stairs, cold weather or stress — and settles when you stop.
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Relieved by rest or GTN
Symptoms ease within a few minutes of rest, or within one to two minutes of GTN spray.
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Radiates to arm, jaw or neck
Pain may spread down the left arm, into the jaw, neck, throat or between the shoulder blades.
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Symptomatic with risk factors
Higher probability with smoking, diabetes, hypertension, high cholesterol or a family history.
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Female atypical presentation
Breathlessness, fatigue, nausea or upper-back discomfort — often without classic chest pain.
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Angina equivalents
Breathlessness on exertion may be the only symptom, particularly in older adults and people with diabetes.
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Red flag
Chest pain lasting more than 15 minutes, or with sweating, vomiting or collapse — call 999.
Treatment
How angina is treated in the UK.
A ladder from fast symptom relief through anti-anginal drugs to revascularisation — chosen to match the pattern and the anatomy.
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GTN spray for symptoms
A short-acting nitrate under the tongue that opens the coronary arteries within minutes.
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Beta-blockers first-line
Slow the heart and reduce oxygen demand — the standard first anti-anginal for most people.
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Calcium channel blockers
Used alone or with a beta-blocker; particularly useful in vasospastic angina.
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Long-acting nitrates
Added when symptoms persist despite first-line therapy; a nitrate-free interval prevents tolerance.
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Ranolazine or nicorandil
Second-line anti-anginals used when standard drugs are not tolerated or not enough.
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Statin and antiplatelet
Secondary prevention — a statin plus low-dose aspirin (or clopidogrel) to reduce future events.
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PCI if significant stenosis
Percutaneous coronary intervention with stenting for flow-limiting single or double-vessel disease.
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CABG for multi-vessel disease
Coronary artery bypass grafting for three-vessel or left-main disease, especially with diabetes.
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 or cardiologist knows your history and can tell you which parts apply to you. If in doubt, seek urgent assessment.
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National Institute for Health and Care Excellence (NICE). Chest pain of recent onset: assessment and diagnosis (CG95).
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European Society of Cardiology. Guidelines for the management of chronic coronary syndromes.
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British Heart Foundation. Angina: patient information.
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Royal College of Physicians. Acute coronary syndromes and chest pain pathways.
Red flags
When angina becomes an emergency.
Stable angina is predictable. These are the situations where the pattern breaks — and you should act today, not tomorrow.
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Chest pain at rest
New or persistent pain without a trigger suggests unstable angina — call 999.
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Pain lasting more than 15 minutes
Prolonged pain that does not settle with rest or GTN needs emergency assessment.
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Pain with sweating or vomiting
Autonomic features raise the probability of a heart attack — do not drive yourself.
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New angina with breathlessness
Especially if severe or at rest — could indicate impaired heart function.
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Syncope with chest pain
Fainting alongside pain suggests significant ischaemia or arrhythmia — urgent care.
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Post-MI new angina
Fresh anginal symptoms after a recent heart attack need same-day cardiology review.
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Angina progressing rapidly
Symptoms occurring more often, at lower thresholds, or lasting longer — call 999.
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New arrhythmia with pain
Palpitations plus chest pain, particularly with light-headedness, warrant emergency care.
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Pain unresponsive to GTN
If two doses of GTN five minutes apart do not settle the pain, call 999.
Living with it
A long-term condition, but a very manageable one.
Four things that make the biggest difference day to day — habits, monitoring, medication and reviews.
A quiet reminder
Consistency beats intensity, every time.
Small, steady changes — kept up for months — do more than a heroic week that does not last.
- 01 Daily habits
Know your triggers
Cold mornings, heavy meals, emotional stress and sudden exertion are common — pacing helps.
- 02 Monitoring
Track frequency and threshold
A rising number of episodes or symptoms at lower effort is a signal to seek review.
- 03 Medication
Carry GTN, always
Keep the spray with you and in date. Use it before predictable exertion if advised.
- 04 Reviews
Annual cardiology review
Yearly at minimum — sooner if symptoms change or new medication is started.
Frequently asked
Everything we get asked about angina.
Quick answers on the stable-vs-unstable distinction, testing, medication and when to worry.
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What is the difference between stable and unstable angina?
Stable angina is predictable — provoked by exertion or emotion and relieved by rest or GTN within minutes. Unstable angina is new, occurs at rest, lasts longer or is getting worse — it is a medical emergency and needs a 999 call.
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How is angina diagnosed in the UK?
A resting ECG followed by a CT coronary angiogram (CTCA) is now the NICE first-line pathway for people with typical or atypical anginal chest pain. Stress imaging or invasive angiography follow when needed.
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Can angina be cured?
It cannot be cured, but it can be very well controlled. Medication, lifestyle change and — where appropriate — PCI or CABG can substantially reduce symptoms and future cardiac events.
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How quickly should GTN spray work?
Symptoms should ease within one to two minutes. If pain persists five minutes after the first dose, take a second. If pain continues five minutes after the second dose, call 999.
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Do women get angina differently?
Often, yes. Women more commonly present with breathlessness, fatigue, nausea, or discomfort in the jaw, neck or upper back — without the classic central chest pain.
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When should I call 999?
Any chest pain lasting more than 15 minutes, chest pain at rest, pain with sweating or vomiting, or new severe symptoms — call 999 immediately.
Related content
Keep reading.
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CT coronary angiogram
NICE first-line non-invasive imaging for anginal chest pain.
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Coronary calcium score
Quantifies plaque burden and refines cardiovascular risk.
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Cardiovascular risk assessment
Blood tests, blood pressure and lifestyle risk in one review.
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