Urticaria (hives)
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Urticaria, or hives, is a skin reaction where pale or red itchy welts appear suddenly, usually lasting a few hours to a day. Acute urticaria (under 6 weeks) often follows infection, food or medication; chronic urticaria (over 6 weeks) is usually spontaneous and not allergy-driven. Antihistamines control most cases; refractory disease needs structured workup and sometimes omalizumab.
Urticaria is one of the most under-diagnosed and over-treated skin conditions we see. Patients walk in with weeks of recurring welts, dozens of food items eliminated, and no clear plan beyond "avoid everything". Most of that elimination work was unnecessary.
The honest framework: acute hives (under 6 weeks) usually have an identifiable trigger and clear up on their own. Chronic hives (over 6 weeks) are almost never a food or product allergy and need a different approach — antihistamine dose optimisation, ruling out a few specific causes, and sometimes longer-term immunomodulation.
How urticaria shows up
- Raised, well-defined welts — pale or red, often with a flushed halo
- Intense itching, usually worse at night
- Lesions appear and fade within hours; individual welts rarely last over 24 hours
- May appear anywhere on the body, often moving from area to area
- Angioedema — deeper swelling of lips, eyelids, hands — in some patients
- Dermographism — welts that follow a scratch line
- Triggers can include heat, cold, pressure, exercise, sun, water in some patients
Common triggers and contributors
- Viral infection (the most common trigger for acute urticaria in children and young adults)
- Medications — NSAIDs, antibiotics, ACE inhibitors are the usual suspects
- Specific food triggers (genuine IgE-mediated allergy is rare and usually causes immediate reactions)
- Physical triggers — heat, cold, pressure, sun, water (chronic inducible urticaria subtypes)
- Autoimmune mechanisms in many chronic cases (anti-FcεRI antibodies)
- Thyroid autoimmunity association in a subset of chronic patients
- Stress and sleep disruption — modulators, not direct causes
When to see a dermatologist
See a dermatologist if hives recur for more than 4–6 weeks despite over-the-counter antihistamines, if welts are accompanied by lip or eye swelling, if breathing or swallowing is affected (this is an emergency — go to a hospital), or if a previously well patient suddenly develops widespread urticaria after starting a new medication.
How hives is treated at SkinWise
First-line treatment is second-generation antihistamines at standard dose, then escalated to up to 4× standard dose for refractory cases — guidelines support this. Chronic urticaria patients who don't respond may need omalizumab (a monthly injection that's transformative for many) or other immunomodulators. We don't recommend strict elimination diets unless there's a clear, reproducible food trigger.
Services that treat hives
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Frequently asked questions
Is this an allergy?
For most chronic urticaria patients, no — chronic spontaneous urticaria is not driven by specific food or environmental allergies. Acute urticaria often does have a trigger (usually viral, sometimes medication). We do focused workup rather than broad allergy testing, which is high-cost and low-yield.
How long will it last?
Acute urticaria typically resolves within days to weeks. Chronic urticaria has a median duration of 2–5 years; most patients eventually go into remission. Good antihistamine control during the active period prevents most of the daily disruption.
Should I eliminate gluten / dairy / certain fruits?
Only if there's clear evidence those specifically trigger your hives — reproducible reactions within an hour or two of eating, ideally documented across multiple exposures. Broad elimination diets rarely help chronic urticaria and often cause nutritional issues. We work through this carefully if you bring a suspicion.
When is hives an emergency?
Throat tightening, breathing difficulty, swelling of the tongue, or sudden widespread reaction after a medication or food — go to a hospital. These are signs of anaphylaxis or angioedema with airway involvement. Urticaria itself is uncomfortable but not dangerous; the rare emergency scenarios involve airway swelling, not the welts.
Ready to start with a consult?
A focused 15-minute first consultation is where we slow down, map your concern and build the smallest plan that will actually move the needle. No oversell, no fixed menu.