Angioedema (deep swelling) assessment (Angioedema assessment)

A specialist assessment of episodes of deep swelling — often of the lips, eyes, tongue or throat — to find the cause, check for less common types, and plan the right treatment, which differs depending on the type.

✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review

In short

Angioedema is deep swelling, often of the lips, tongue or throat, with several different causes that need different treatments.
ACE inhibitor blood-pressure tablets are a common cause and can trigger swelling even after years of use; stopping the drug is central to treatment.
Hereditary angioedema and other C1-inhibitor problems do not respond to adrenaline, antihistamines or steroids and need specific medicines — so the type must be identified.
Swelling of the tongue or throat, or any breathing difficulty, is an emergency: call 999.

A plain-English summary. The detail — including risks and recovery — is below.

At a glance

TypeSpecialist assessment for deep swelling

AnaestheticNot needed

How long it takesAbout 20–40 minutes

Hospital stayOutpatient

Time off workUsually none

When you'll see resultsA working diagnosis is usually agreed at the appointment; specific blood tests follow within a couple of weeks

On the NHS?Available on the NHS when clinically indicated; private clinics may be used for speed or a second opinion

A general guide. Your specialist will give you advice for your situation.

Best fit

Identifying which type of angioedema you have, so the right treatment can be used

Pause if

Routine allergy testing is the wrong test for angioedema without hives or an obvious allergic trigger.

Main recovery point

You usually leave with a working diagnosis, an emergency plan, and any medicine changes advised — for example stopping an ACE inhibitor under guidance.

Good aftercare

A clear written emergency plan tailored to the type of angioedema.

Same day

You usually leave with a working diagnosis, an emergency plan, and any medicine changes advised — for example...

Within 1–2 weeks

Specific blood tests, such as C4 and C1-inhibitor level and function, come back and the diagnosis is confirmed or...

First weeks

If an ACE inhibitor was stopped, swelling episodes usually become less frequent, though this can take time...

Ongoing

Confirmed hereditary angioedema is usually managed at a specialist centre with specific treatments, an emergency...

Medical line illustration of chronic urticaria angioedema for Angioedema (deep swelling) assessment. — Illustration only - not a diagnosis, medical advice or a promise of result. Your anatomy and treatment plan may differ. Vuemedics does not publish before-and-after photos.

What is an angioedema (deep swelling) assessment?

Angioedema is swelling deeper in the skin and tissues, most often affecting the lips, eyelids, tongue, throat, hands or genitals. Unlike ordinary hives, it can feel tight or painful rather than itchy, and swelling of the tongue or throat can affect breathing.

An assessment is an appointment to work out why the swelling is happening, because there are several different causes that need very different treatment. Getting the type right matters.

The most common form goes along with hives and responds to antihistamines, like urticaria. But some angioedema is caused by medicines — particularly blood-pressure tablets called ACE inhibitors, which can cause swelling even after years of safe use. A rarer group is caused by a problem with a blood protein called C1 inhibitor, which includes hereditary angioedema (HAE) that runs in families. These bradykinin-driven types do not respond to adrenaline, antihistamines or steroids and need their own specific treatments.

The assessment confirms which type you have so the right treatment and emergency plan can be put in place.

Types, options & approaches

There may be different ways to do this. The right approach depends on the clinical question and your circumstances.

Histamine-driven (allergic or with urticaria)

Swelling that goes with hives and itching, behaving like urticaria. It usually responds to antihistamines and is the most common form.

Drug-induced (ACE inhibitor) angioedema

Swelling caused by ACE inhibitor blood-pressure tablets, sometimes after years of use. It does not itch, can affect the tongue and throat, and improves once the drug is stopped under medical advice.

Hereditary angioedema (HAE)

A rare inherited condition from a problem with the C1-inhibitor protein. Attacks of swelling are recurrent, can affect the gut (causing pain) and airway, and need specific treatments — not adrenaline, antihistamines or steroids.

Acquired C1-inhibitor deficiency

A rare non-inherited form, sometimes linked to other conditions, also caused by low or faulty C1 inhibitor. It is assessed with similar blood tests to HAE.

Idiopathic angioedema

Recurrent swelling with no identifiable cause after assessment. It is often managed like histamine-driven angioedema while being kept under review.

Why the type of angioedema matters

	Histamine-driven	Bradykinin-driven (ACE inhibitor / HAE)
Itchy or with hives	Often	Usually not
Responds to antihistamines	Yes	No
Responds to adrenaline/steroids	Helps allergic types	No
Main treatment	Antihistamines, avoid triggers	Stop ACE inhibitor / specific HAE medicines

This is why identifying the type is so important: the wrong assumption can mean swelling is treated with medicines that do not work.

Preparing for your test

Note when the swelling happens, which parts of the body, how long it lasts, and whether it itches or is painful.
Take photos of the swelling when it is present, as it often settles before the appointment.
Bring a full list of your medicines, especially any blood-pressure tablets — ACE inhibitors (often ending in '-pril') are a key cause.
Note any family history of recurrent swelling or hereditary angioedema.
Mention any episodes of unexplained tummy pain, which can occur in hereditary angioedema.
Note any swelling of the tongue or throat, or breathing difficulty, and treat these as emergencies.
Bring details of any treatments tried, including whether antihistamines, steroids or adrenaline helped.

What happens

The specialist asks in detail about your swelling: where, how often, how long, whether it itches, what seems to trigger it, your medicines and your family history. They examine you and look for whether hives are present.

The history often points to the likely type. If a C1-inhibitor problem (such as hereditary angioedema) is possible — for example recurrent swelling without hives, a family history, or unexplained tummy pain — specific blood tests are arranged, usually including complement C4 and C1-inhibitor level and function.

If an ACE inhibitor is the likely cause, your prescriber will usually be advised to stop it and switch to a different blood-pressure treatment. You leave with a working diagnosis, advice on emergency symptoms, and a plan that depends on the type of angioedema found.

Is this test right for me?

A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.

May not be suitable if…

Routine allergy testing is the wrong test for angioedema without hives or an obvious allergic trigger.
Assuming all angioedema is allergic risks missing ACE inhibitor and C1-inhibitor causes.
Unproven 'food intolerance' tests have no role in finding the cause of angioedema.
If swelling is affecting the airway now, this is an emergency, not a clinic assessment.

Delay or rearrange if…

You are having an acute airway-threatening attack — call 999 instead.
You are acutely unwell, which can affect blood-test interpretation.
You cannot yet safely change a suspected causative medicine without your prescriber's input.
You are pregnant or trying to conceive, as this affects medicine choices and should be discussed.

Alternatives to discuss

Stopping and substituting an ACE inhibitor under your prescriber's guidance if that is the likely cause.
Antihistamine-led treatment for histamine-driven angioedema, as for urticaria.
Referral to a specialist immunology centre for confirmed C1-inhibitor problems.
Watchful waiting with an emergency plan for infrequent, mild episodes.
Genetic and family assessment where hereditary angioedema is confirmed.

Before you decide

Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.

What matters most to me?

Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.

What are all my options?

Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.

What would make me pause?

Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.

What happens if I do nothing today?

For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.

Benefits

Identifying which type of angioedema you have, so the right treatment can be used
Spotting an ACE inhibitor or other medicine as a reversible cause
Detecting rare but important conditions such as hereditary angioedema
A clear emergency plan for swelling that could affect breathing
Avoiding ineffective treatments for bradykinin-driven swelling
Family testing and advice where an inherited cause is found

Risks & complications

More common

Swelling that has settled by the appointment, making it harder to assess without your photos
Needing blood tests that take a couple of weeks to come back
Uncertainty about the cause when episodes are infrequent

Less common

Blood tests that need repeating to confirm a C1-inhibitor problem
A change to your blood-pressure medicine, which needs monitoring
Referral on to a specialist centre for confirmed hereditary angioedema

Rare but serious

An attack involving the airway during assessment, which is a medical emergency
A diagnosis with implications for blood relatives who may also need testing

The most important issues are not missing an ACE inhibitor cause and not missing a C1-inhibitor problem, because both change treatment completely. Tell the specialist about all blood-pressure tablets, any family history of swelling, and any unexplained tummy pain. Swelling of the tongue or throat is always an emergency.

Published figures to discuss

Angioedema covers several distinct conditions, so a single rate is not meaningful. Blood tests for C1-inhibitor problems are interpreted alongside the history and are sometimes repeated. Figures below are broad and for context only.

Figure	Reported range	How to interpret it	Source / confidence
Angioedema in people taking ACE inhibitors	Reported in roughly 0.1–0.7% of users in studies	It can occur after years of use; the drug should be stopped under medical advice if it is the cause.	ACE inhibitor-induced angioedema patient series — PMCncbi.nlm.nih.govPublished figure
Hereditary angioedema in the population	Rare (estimated around 1 in 50,000)	Rare but important, because treatment is specific; a family history raises the likelihood.	ACE inhibitor-induced angioedema patient series — PMCncbi.nlm.nih.govPublished figure
Airway involvement in angioedema	Uncommon overall but potentially life-threatening	Tongue, throat or voice change symptoms are emergency symptoms even if previous swelling settled.	Guide sourcesClinical context
Antihistamines failing in bradykinin-mediated angioedema	Expected rather than rare	ACE-inhibitor and hereditary angioedema often do not respond to antihistamines or steroids, so the mechanism matters.	Guide sourcesClinical context

These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.

What happens afterwards

There is no physical recovery from the appointment. 'Afterwards' is about acting on the working diagnosis, waiting for any specific blood tests, and following the emergency plan.

Same day

You usually leave with a working diagnosis, an emergency plan, and any medicine changes advised — for example stopping an ACE inhibitor under guidance.

Within 1–2 weeks

Specific blood tests, such as C4 and C1-inhibitor level and function, come back and the diagnosis is confirmed or refined.

First weeks

If an ACE inhibitor was stopped, swelling episodes usually become less frequent, though this can take time. Treatment is matched to the confirmed type.

Ongoing

Confirmed hereditary angioedema is usually managed at a specialist centre with specific treatments, an emergency plan, and family testing.

What's normal — and not a worry

Swelling episodes that continue for a while after stopping a causative drug, then ease
Waiting a couple of weeks for specific blood results
Needing repeat blood tests to confirm a C1-inhibitor problem
Adjusting to a new blood-pressure medicine if one was changed

Aftercare

If advised to stop an ACE inhibitor, do so under medical guidance and start the alternative as directed.
Avoid the suspected trigger or medicine and make sure it is recorded as a cause of swelling in your records.
Keep your emergency plan to hand and know exactly when to call 999.
If you have a bradykinin-driven type, learn the specific treatment plan and carry any prescribed emergency medicine.
Encourage blood relatives to be tested if hereditary angioedema is confirmed.
Keep a diary of episodes to help judge whether treatment is working.
Attend follow-up so the diagnosis and plan can be confirmed and reviewed.

Before your test

Photos and diary of swelling episodes saved
Full medicine list, including blood-pressure tablets, reviewed
Any ACE inhibitor change started and recorded
Specific blood tests booked or done
Emergency plan for airway swelling understood
Family testing arranged if an inherited cause is found
Follow-up appointment booked

⚠ Get urgent help if…

Swelling of the tongue, throat or voice box
Difficulty breathing, swallowing or a change in your voice — call 999
Swelling that is spreading rapidly
Feeling faint or collapsing with swelling
Severe, unexplained tummy pain with swelling episodes (can occur in hereditary angioedema)
Any swelling not responding to your usual emergency treatment

Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.

General guidance — it doesn't replace the specific advice your specialist gives you.

Results & realistic expectations

A good result is a confident diagnosis of the type of angioedema and a treatment plan that matches it — for example antihistamines for histamine-driven swelling, stopping the drug for ACE inhibitor cases, or specific treatments for hereditary angioedema.

The assessment cannot always identify a cause; some angioedema remains idiopathic after full testing. Normal C1-inhibitor blood tests make hereditary angioedema unlikely but the results are interpreted alongside your history, and tests are sometimes repeated to be sure.

How long it lasts

How long angioedema lasts depends on the type. Drug-induced angioedema usually improves once the medicine is stopped, though it can take weeks. Histamine-driven angioedema may settle like urticaria over time. Hereditary angioedema is a lifelong condition managed with specific treatments and an emergency plan, but with good care most people lead full lives.

Related tests, treatments or support

An angioedema assessment is often combined with a chronic urticaria assessment when hives are also present, because the two frequently occur together and are treated similarly. Where a C1-inhibitor problem is found, it is combined with referral to a specialist immunology centre and family testing.

Follow-up & long-term care

You should be told your working diagnosis at the appointment and have specific blood results back within a couple of weeks. Confirmed hereditary angioedema is managed long-term at a specialist centre. Ask who to contact if you have a severe episode while waiting for results.

Keep the causative medicine clearly recorded as something to avoid
Carry any prescribed emergency treatment for bradykinin-driven types
Attend specialist review for hereditary angioedema
Keep an up-to-date emergency plan and share it with those around you
Arrange testing for relatives where an inherited cause is confirmed

Repeat, follow-on and what comes next

Blood tests are sometimes repeated to confirm or exclude a C1-inhibitor problem.
A working diagnosis may be refined once specific results return.
Treatment is adjusted to the confirmed type, and emergency plans updated accordingly.

Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.

What good aftercare looks like

A clear written emergency plan tailored to the type of angioedema.
A named contact for severe episodes while results are awaited.
Confirmation that any causative medicine is recorded as a cause to avoid.
Referral to a specialist centre and family testing for hereditary angioedema.
Review to confirm the diagnosis once specific blood tests return.

What affects the cost

Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:

Length and complexity of the consultation
Specific blood tests such as complement C4 and C1-inhibitor level and function
Whether tests need repeating to confirm a diagnosis
Follow-up appointments and onward referral to a specialist centre
Family testing where an inherited cause is found
Any specific emergency medicines prescribed for bradykinin-driven types

Make sure your written quote includes

The specialist's consultation fee
Which blood tests are included and the cost of any specialist assays
Cost of repeat testing if results are equivocal
Cost of follow-up appointments
Whether onward referral to a specialist centre is included
What happens, and what it costs, if the cause cannot be confirmed
Cancellation policy

On the NHS? Angioedema is assessed and treated on the NHS when clinically indicated, including specialist centres for hereditary angioedema; private clinics may be used for speed or a second opinion.

You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.

Choosing a specialist safely

Check the specialist is on the GMC Specialist Register for this area.
Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
You're entitled to your total cost in writing — including any follow-up — before you decide.

How Vuemedics verifies every consultant →

Questions to ask your medical professional

Take this to your consultation. A good specialist will welcome every one of these.

Which type of angioedema do I have, and how confident are you?
Could any of my medicines, especially blood-pressure tablets, be causing this?
Do I need C1-inhibitor and complement blood tests, and what would they change?
Does my swelling respond to antihistamines, or could it be a bradykinin-driven type?
What is my emergency plan if my tongue or throat swells?
If this is hereditary, should my relatives be tested?
Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
Will you be the specialist who carries out my test, and who looks after me afterwards?
What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
What does a realistic result look like — and what can this test not achieve?
What are my options, including waiting, doing nothing for now, or choosing a different approach?
Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
What is the total cost in writing, including any follow-ups, and how much time do I have to decide?

Frequently asked questions

Is angioedema always an allergy?

No. Some angioedema is allergic and itchy, but important types are not — including swelling caused by ACE inhibitor blood-pressure tablets, and hereditary angioedema, which is caused by a blood-protein problem.

My blood-pressure tablet has not changed — can it still be the cause?

Yes. ACE inhibitors can cause angioedema even after months or years of taking them safely. This is why your full medicine list matters, and why the drug is often stopped under medical advice.

Why do antihistamines and adrenaline not help my swelling?

If your angioedema is bradykinin-driven, such as hereditary angioedema or an ACE inhibitor cause, it does not respond to antihistamines, steroids or adrenaline. It needs its own specific treatment, which is why identifying the type is essential.

Could this run in my family?

Hereditary angioedema is inherited and can affect blood relatives, so family testing is offered when it is confirmed. Most angioedema, though, is not inherited.

Can I get assessed on the NHS?

Yes. Recurrent or severe angioedema can be assessed on the NHS, and hereditary angioedema is managed at specialist NHS centres. Private clinics may be used for a faster appointment or second opinion.

What should I do if my throat swells?

Treat it as an emergency and call 999. Tongue or throat swelling can affect breathing. Make sure you have a written emergency plan for the type of angioedema you have.

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How we made this page

Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →

Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.

Sources & standards: NICE CKS — Angioedema and anaphylaxis BSACI guideline — Chronic urticaria and angioedema (PDF) NHS — Swelling under the skin (angioedema) ACE inhibitor-induced angioedema patient series — PMC HAE UK — hereditary angioedema patient support

Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.

Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.