Chronic urticaria and angioedema assessment (Assessment of chronic urticaria and angioedema)
A specialist assessment for people with hives (urticaria) and/or deeper swelling (angioedema) lasting six weeks or more, to find the type, look for triggers and any underlying cause, and plan treatment.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- The assessment classifies hives and swelling lasting six weeks or more, looks for triggers and any underlying cause, and plans treatment.
- Most chronic urticaria is spontaneous; extensive allergy testing is usually unnecessary and can mislead.
- Antihistamines are the mainstay and may be increased to higher-than-usual doses under specialist advice before other options are considered.
- Swelling without any hives may have a different, bradykinin-driven cause that does not respond to antihistamines — this needs to be recognised and managed differently.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Clarifies the type of urticaria or angioedema you have.
Broad allergy testing is usually the wrong approach for chronic spontaneous urticaria and can produce misleading results.
You usually leave with a working diagnosis and an initial treatment plan, often involving non-sedating antihistamines.
A clear written diagnosis and stepwise treatment plan.
You usually leave with a working diagnosis and an initial treatment plan, often involving non-sedating...
Any blood tests are processed. You start or adjust treatment and continue your symptom diary.
Treatment is reviewed. If symptoms persist, antihistamines may be increased to higher-than-usual doses under...
Referral or escalation to specialist treatments such as omalizumab or ciclosporin, with appropriate monitoring.
What is a chronic urticaria and angioedema assessment?
Urticaria (hives or nettle rash) means raised, itchy weals that usually fade within 24 hours. Angioedema is deeper swelling, often of the lips, eyes, hands or genitals. When these last, or keep coming back, for six weeks or more, it is called chronic, and a specialist assessment helps work out the type and the best treatment.
Most chronic urticaria is spontaneous, meaning no single outside trigger is found, although things like heat, pressure, stress, alcohol and some painkillers can make it worse. The assessment, usually by an allergist, immunologist or dermatologist, focuses on a careful history and examination. Extensive allergy testing is often not needed and can be misleading.
An important distinction is angioedema without any hives. This raises the possibility of a different, bradykinin-driven cause, such as C1-inhibitor deficiency or a reaction to certain blood pressure medicines (ACE inhibitors), which does not respond to antihistamines and needs different management. Spotting this is a key job of the assessment.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Hives with swelling vs swelling alone
| Feature | Urticaria (± swelling) | Angioedema alone |
|---|---|---|
| Itchy weals | Yes | No |
| Main chemical | Histamine | Often bradykinin |
| Antihistamines | Usually help | Often do not help |
| Key extra tests | Usually few | C1-inhibitor, complement |
Recurrent swelling without any hives, especially if antihistamines do not help, needs testing for bradykinin-driven causes such as C1-inhibitor deficiency.
Preparing for your test
- Keep a diary with photos: when weals appear, how long each lasts, and where swelling occurs.
- Note anything that seems to trigger or worsen it — heat, pressure, exercise, alcohol, stress, infections or specific foods.
- List all medicines, especially painkillers (such as aspirin and ibuprofen) and blood pressure tablets (especially ACE inhibitors), as these can cause or worsen symptoms.
- Record whether swelling ever happens without any itchy rash.
- Note any family history of recurrent swelling or angioedema.
- Bring details of any previous treatments tried and how well they worked.
- Write down how the condition affects your sleep, work and daily life.
What happens
The specialist takes a detailed history, focusing on how long individual weals last, whether deeper swelling occurs, what makes it worse, and which medicines you take. They examine your skin and may test for inducible types, for example by applying pressure or a cold stimulus.
For most people, only limited blood tests are needed, such as a full blood count, inflammation markers and thyroid function. If you have swelling without hives, or it does not respond to antihistamines, the specialist arranges complement and C1-inhibitor tests to look for a bradykinin-driven cause. If weals last more than a day or leave bruising, a skin biopsy may be suggested.
You usually leave with a working diagnosis and a treatment plan, often starting or adjusting antihistamines, with a plan to review and step up treatment if needed.
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…
- Broad allergy testing is usually the wrong approach for chronic spontaneous urticaria and can produce misleading results.
- Antihistamine-based assessment is not appropriate for angioedema without hives, which may need complement and C1-inhibitor testing instead.
- It is not the right pathway for a single acute reaction, which may be anaphylaxis needing emergency care and allergy assessment.
- Restrictive elimination diets are rarely justified without clear evidence of a food trigger.
Delay or rearrange if…
- You are in the middle of an acute, severe reaction — this needs emergency treatment first.
- You have significant airway swelling, which must be managed urgently before routine assessment.
- A recent infection is driving a temporary flare, which may settle on its own.
- You have just started or stopped a medicine that could be responsible, so its effect can be judged.
- Pregnancy is a consideration, as it may affect treatment choices.
Alternatives to discuss
- Watchful waiting with antihistamines if symptoms are mild, since many cases settle over time.
- Dermatology assessment if urticarial vasculitis or another skin condition is suspected.
- Specific allergy testing only when the history clearly points to a trigger.
- Immunology assessment and C1-inhibitor testing for swelling without hives.
- Reviewing and adjusting medicines (such as stopping an ACE inhibitor) where these are implicated.
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
- Clarifies the type of urticaria or angioedema you have.
- Identifies the small number of cases with a specific or serious underlying cause.
- Avoids unnecessary, misleading allergy tests and restrictive diets.
- Provides a clear, stepwise treatment plan, including how to use antihistamines effectively.
- Flags swelling that needs different (non-antihistamine) management and emergency planning.
- Reassures most people that the condition, while frustrating, is not dangerous and often settles over time.
Risks & complications
- Frustration if no specific trigger is found (which is the usual outcome)
- Bruising or soreness if blood tests are taken
- Symptoms continuing while the right treatment is found
- Drowsiness if older sedating antihistamines are used by mistake
- False reassurance or false alarm from unnecessary allergy tests
- Inconclusive results needing repeat or further testing
- Side effects from higher-dose antihistamines, such as drowsiness or dry mouth
- Missing a bradykinin-driven angioedema if swelling-without-hives is not recognised
- Overlooking urticarial vasculitis or another systemic condition
- A severe swelling episode affecting the airway if a bradykinin cause is not managed appropriately
The most important pitfall is treating all swelling as if it were allergic. Angioedema without hives, or that does not respond to antihistamines, may be bradykinin-driven (for example from C1-inhibitor deficiency or ACE inhibitor medicines) and needs different management and an emergency plan, because it can affect the airway. Ask your specialist specifically about this if your swelling ever occurs without an itchy rash.
Published figures to discuss
Chronic urticaria is common and usually not dangerous, but its cause is often never pinned down and its duration varies a lot between people. Test yields are generally low because most cases are spontaneous. Because how long it lasts and how well it responds to treatment differ widely, exact figures are not quoted here; your specialist can explain what is typical.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Chronic spontaneous urticaria being caused by hidden food allergy | Uncommon | Daily or recurrent hives for more than 6 weeks are usually not explained by one hidden food. | Guide sourcesClinical context |
| Autoimmune thyroid disease or thyroid antibodies | Reported in up to around 30% in some chronic urticaria studies | Thyroid testing may be useful in selected patients, but most extensive allergy panels are not. | NICE CKS — Urticariacks.nice.org.ukPublished figure |
| ACE-inhibitor angioedema | Reported in roughly 0.1 to 0.7% of users | It can start after years on treatment and usually requires stopping the ACE inhibitor under medical advice. | NICE CKS — Urticariacks.nice.org.ukPublished figure |
| Repeated steroid courses for chronic urticaria | Recognised marker of poor control | Guidelines usually escalate non-sedating antihistamines and specialist treatments rather than relying on repeated steroids. | 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 assessment. “Afterwards” means starting or adjusting treatment and reviewing how well it controls your symptoms.
- Hives and swelling that come and go for weeks or months while treatment is optimised
- Gradual improvement as the right antihistamine dose is found
- Mild drowsiness or dry mouth from antihistamines in some people
- A normal set of test results, which is common and usually reassuring
Aftercare
- Take antihistamines as prescribed, including any higher-than-licensed dose your specialist advises, rather than only when symptoms flare.
- Avoid known aggravating factors where practical, such as overheating, alcohol or unnecessary painkillers.
- Avoid ACE inhibitor blood pressure tablets if these are linked to your swelling, on medical advice.
- Keep your symptom diary so treatment can be judged objectively.
- Have an emergency plan if you have significant throat or tongue swelling, and know when to call 999.
- Attend follow-up so treatment can be stepped up or down.
- Keep copies of any test results, especially complement or C1-inhibitor tests.
- Symptom diary with photos and timings
- List of medicines, including painkillers and blood pressure tablets
- Note of whether swelling ever happens without hives
- Record of previous treatments and their effect
- Family history of recurrent swelling noted
- Questions about emergency planning for severe swelling
- Follow-up appointment booked
⚠ Get urgent help if…
- Swelling of the tongue, throat or mouth, or any difficulty breathing or swallowing — call 999
- A sudden, severe reaction with feeling faint, widespread rash and breathing trouble (possible anaphylaxis)
- Recurrent severe swelling that does not respond to antihistamines
- Weals that last more than 24 hours, are painful, or leave bruising
- Fever, joint pains or feeling generally unwell with the rash
- Swelling that started after beginning a new blood pressure tablet
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 assessment gives you a clear diagnosis of the type of urticaria or angioedema, an explanation that most cases are spontaneous and not caused by a hidden allergy, and a practical treatment plan. For most people, blood tests are normal, which is reassuring rather than disappointing.
The assessment cannot always say why chronic urticaria started, and it cannot guarantee how long it will last, though many cases settle over months to a few years. Its key safety role is to pick out the minority with a specific cause — such as bradykinin-driven angioedema or urticarial vasculitis — who need different treatment.
Chronic spontaneous urticaria often comes and goes and tends to improve over time, although this varies and some people have it for several years. Treatment controls symptoms rather than curing the condition, and doses are stepped up or down as activity changes. Your plan should be reviewed regularly, and treatment can often be reduced once symptoms are well controlled.
Related tests, treatments or support
The assessment may be combined with thyroid tests, since thyroid disease can coexist, and with complement and C1-inhibitor tests when a bradykinin cause is suspected. A skin biopsy is added if urticarial vasculitis is possible. Allergy testing is only used when the history genuinely points to a specific allergen, rather than as a routine screen.
Follow-up & long-term care
You should be reviewed to check how well treatment is working and to step it up if needed, for example increasing antihistamine doses or moving on to specialist treatments such as omalizumab. If a specific cause is found, follow-up is tailored to that condition. You should be told your results and given a clear plan, including what to do in an emergency.
- Continue regular antihistamines as advised, not just during flares.
- Review treatment periodically so it can be reduced when symptoms settle.
- Keep avoiding identified aggravating factors where practical.
- Carry an emergency plan if you have significant angioedema.
- Have repeat or additional tests only if your symptoms or pattern change.
Repeat, follow-on and what comes next
- Treatment is commonly stepped up (for example higher antihistamine doses, then omalizumab) until control is achieved.
- A working diagnosis may be revised if the pattern changes or new features appear.
- Tests are usually only repeated if symptoms or red-flag features change.
- Treatment is reduced or stopped over time as the condition settles, then restarted if it flares.
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 diagnosis and stepwise treatment plan.
- Specific advice on how to take antihistamines, including any higher dose.
- An emergency plan for significant angioedema, with when to call 999.
- A named contact and scheduled review to step treatment up or down.
- Onward referral for specialist treatment if symptoms are not controlled.
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:
- The length and complexity of the specialist consultation
- Whether blood tests are needed and how many
- Whether complement and C1-inhibitor tests are required for swelling without hives
- Whether a skin biopsy is needed for possible vasculitis
- Follow-up appointments to review and adjust treatment
- The cost of specialist treatments such as omalizumab if antihistamines are not enough
- The specialist consultation fee
- Any blood tests planned and their cost
- Whether C1-inhibitor and complement testing is included if relevant
- Follow-up appointments to review treatment
- How and when results will be reported to you
- What happens, and what it costs, if symptoms persist and further treatment is needed
- Cancellation and rebooking policy
On the NHS? Assessment and treatment of chronic urticaria and angioedema are available on the NHS when clinically indicated, usually through allergy, immunology or dermatology services; private assessment may be used for faster access or a specialist 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.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Treating all angioedema as allergic and missing a bradykinin-driven cause.
- Ordering broad allergy panels that generate misleading positives.
- Not explaining that most cases have no identifiable cause and often settle.
- Failing to give an emergency plan for significant airway swelling.
- Not making clear how higher-dose antihistamines should be taken and monitored.
Marketing red flags
- Promising to find the ‘hidden allergy’ behind chronic urticaria.
- Selling extensive food-intolerance or allergy panels as routine.
- Recommending restrictive diets without evidence of a trigger.
- Not distinguishing histamine-driven from bradykinin-driven swelling.
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.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- What type of urticaria or angioedema do I have?
- Does my swelling ever happen without hives, and should I be tested for a bradykinin cause?
- Which tests do I actually need, and which can be avoided?
- How should I take my antihistamines, and can the dose be increased?
- What are the next options if antihistamines do not control it?
- What is my emergency plan if I get severe swelling of the throat or tongue?
- 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 chronic urticaria caused by a food allergy?
Why might antihistamines not work for my swelling?
Is it safe to take higher-than-normal doses of antihistamines?
Will my chronic urticaria go away?
Do I need lots of tests?
When is this an emergency?
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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: BSACI — Chronic spontaneous urticaria with/without angioedema BSACI guideline for the management of chronic urticaria and angioedema (PDF) NICE CKS — Urticaria NHS — Hives (urticaria) NHS — Angioedema British Association of Dermatologists guidelines for chronic urticaria 2021
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.
Related guides: Chronic hives (urticaria) assessment · Angioedema (deep swelling) assessment · Acquired angioedema management · Allergy consultation · Clinical immunology consultation