Itchy weals that come and go. Most chronic cases never have an identifiable trigger — and that is normal.
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Hives — urticaria — are raised, intensely itchy weals that appear on the skin, often with no warning. They can be a few spots or cover the body.
The defining feature, and the one that separates hives from almost everything else, is that individual weals last less than 24 hours and move around. A spot appears, itches, and is gone within a day — while new ones come up elsewhere. That pattern is what identifies it.
If an individual lesion lasts more than 24 hours in the same place, bruises as it fades, or burns rather than itches, that is not ordinary urticaria and it needs assessing properly — it may be urticarial vasculitis, which is investigated differently.
Two points that change how people are treated:
Deeper swelling, occurring alongside hives in around half of people:
Where a physical trigger reliably brings them on — worth recognising, because they are often dismissed:
In most people no cause is ever found, and this is the expected outcome rather than a failure of investigation. It is usually an autoimmune process in which the body's own antibodies trigger histamine release.
An important distinction, because these are aggravators rather than allergies:
ACE inhibitors — blood pressure medicines ending in "-pril" — can cause angioedema, and it can start after years of taking the drug without any problem. Because the timing seems to rule the drug out, this is regularly missed. Swelling of the lips, tongue or throat in someone on ramipril or lisinopril should always raise it.
Hives are diagnosed clinically, and photographs plus the history do it — which suits remote consultation well. The critical question is how long an individual spot lasts, and that is something only you can tell us.
Acute hives need no tests at all. For chronic hives:
This is where most treatment goes wrong.
A brief course of oral steroids can settle a severe acute flare. They are not a treatment for chronic urticaria — repeated courses cause real harm, and rebound flares on stopping are common.
Referral to dermatology or immunology. Omalizumab is highly effective for chronic urticaria resistant to antihistamines, and other options exist. Nobody should spend years scratching because the escalation ladder stopped at one tablet.
The drug is stopped and never restarted, and an alternative blood pressure medicine started. This is worth raising even if you have taken it for years without trouble, because that is exactly how it presents.
Call 999 immediately for:
This is anaphylaxis. Use an adrenaline auto-injector if you have one, and call 999 even if symptoms improve — reactions can return after an apparent recovery.
Seek same-day medical advice for:
Book an appointment for:
Worth being direct, because the effort involved is enormous and usually wasted. In chronic hives, no food trigger is found in the great majority of people.
A genuine food allergy is immediate — within an hour — and happens every single time you eat that food. If the link is inconsistent, or the reaction comes hours later, it is almost certainly not the food.
Progressive elimination diets narrow nutrition, take over daily life, and rarely find anything. If you want to test a specific suspicion, keep a two-week diary and check whether it truly holds — rather than removing foods one after another indefinitely.
If cold reliably brings out your hives, do not swim in cold water. Whole-body cold exposure can cause a massive histamine release, a sudden drop in blood pressure and collapse — which in water is genuinely dangerous. Worth knowing before a summer swim.
Most chronic urticaria eventually resolves by itself — often within one to five years. That is a long time to be uncomfortable, which is exactly why proper treatment matters in the meantime, but it does usually end.
Non-sedating antihistamines are available over the counter for a few pounds, and for an ordinary short-lived episode of hives that is the right answer. Your NHS GP treats urticaria free.
The most useful thing about chronic hives — lasting more than six weeks — is that the standard dose is often not enough, and that guidelines explicitly support going higher. UK and European guidance supports increasing a non-sedating antihistamine to up to four times the standard dose for chronic urticaria that has not responded.
That is a prescribing decision rather than something to do from the packet, and it is the single most valuable thing a consultation offers here — because a great many people take one tablet a day, get partial relief, and assume nothing more can be done.
Fexofenadine is a good choice to escalate, since it barely enters the brain and drowsiness does not climb with the dose.
What is worth knowing about causes: in chronic spontaneous urticaria no trigger is ever identified in the majority of people, and extensive allergy testing usually finds nothing. We will not arrange broad allergy panels or IgG food intolerance tests, which mislead rather than inform.
Where NHS referral matters is treatment-resistant disease, where omalizumab is available through specialist services and is highly effective.
Hives with swelling of the lips, tongue or throat, or any breathing difficulty, is an emergency — call 999.
BSACI (British Society for Allergy and Clinical Immunology) guideline for the management of chronic urticaria and angioedema is the principal UK reference. It recommends a non-sedating antihistamine as first-line, with updosing to up to four times the licensed dose where response is inadequate.
The EAACI/GA²LEN/EDF/WAO international guideline sets out the same stepwise approach, adding omalizumab for antihistamine-refractory chronic spontaneous urticaria.
NICE Clinical Knowledge Summary, Urticaria, covers primary care assessment and treatment, and notes that routine allergy testing is not indicated in chronic spontaneous urticaria, where an external trigger is rarely found.
NICE TA339 covers omalizumab for treatment-resistant chronic spontaneous urticaria.
BSACI guidance also covers angioedema without weals, including ACE inhibitor-induced angioedema and hereditary angioedema, which are managed differently.
By how long a single spot lasts. In urticaria, each individual weal appears, itches and vanishes completely within 24 hours, leaving no mark, while new ones come up elsewhere. If a lesion stays in the same place beyond a day, bruises as it fades, or burns rather than itches, that is a different condition and needs assessing.
Most likely none. In chronic hives, no food trigger is found in the great majority of people, and searching for one is the commonest wasted effort in this condition. A genuine food allergy is immediate — within an hour — and happens every single time. If the link is inconsistent or delayed, it is almost certainly not the food.
Ask about the dose. Standard practice in chronic urticaria is to increase a non-sedating antihistamine up to four times the usual dose, taken every day — and most people have never been offered that. It is the single commonest reason people conclude antihistamines do not work for them. Beyond that, referral for omalizumab is very effective.
Yes, for chronic hives. Antihistamines work by prevention rather than rescue, so taking one only when spots appear is always playing catch-up. Daily use, at an adequate dose, is what achieves control.
Usually, yes — most chronic urticaria resolves by itself, often within one to five years. That is a long time to be uncomfortable, which is why proper treatment in the meantime matters. It is a condition to control rather than one to endure.
Very possibly, if you take an ACE inhibitor — a drug ending in "-pril". These cause angioedema, and it can begin after years of trouble-free use, which is exactly why it gets missed. Raise it. The drug is stopped and an alternative used.
For chronic hives, almost never. Broad allergy panels produce meaningless positive results and lead to unnecessary food restriction. Testing is useful only where the history points clearly at one specific thing — an immediate, reproducible reaction to a named food, or to a sting.
Stress does not cause chronic urticaria, but it is a genuine aggravator, as are heat, alcohol and anti-inflammatories. Saying so is not the same as saying it is in your head — this is a real histamine-driven condition with effective treatment, and it should be treated as such rather than explained away.
August 23, 2026
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