Acute urticaria
Also known as: acute urticaria, acute hives, acute spontaneous urticaria, allergic urticaria, acute wheals, acute urticaria with angioedema
Acute urticaria is the sudden appearance of transient, raised, usually itchy or burning wheals caused by the release of histamine and other inflammatory mediators in the skin. Individual wheals characteristically resolve within 24 hours, although new lesions may continue to appear elsewhere for days or weeks. Acute urticaria lasts less than six weeks and may be associated with viral or bacterial infection, foods, medicines, insect stings, contact exposures or physical triggers, although no definite cause is identified in many cases. Angioedema may accompany urticaria and produces deeper swelling, commonly affecting the lips, eyelids, face, hands, feet or genital region. Urticaria alone is not necessarily anaphylaxis, but hives accompanied by breathing difficulty, throat or tongue swelling, wheeze, persistent cough, voice change, dizziness, collapse, hypotension or severe gastrointestinal symptoms may represent anaphylaxis. Anaphylaxis is a medical emergency for which adrenaline is first-line treatment. Second-generation, non-sedating H1 antihistamines are the principal biomedical treatment for uncomplicated urticaria. TCM differentiation commonly includes Wind-Heat affecting the exterior, Wind-Cold constraining the skin, Damp-Heat, Blood Heat generating Wind, gastrointestinal accumulation producing Heat, or Qì and Blood deficiency with susceptibility to Wind. Acupuncture and Chinese herbal medicine are adjunctive and must never delay adrenaline, emergency services, airway management, antihistamines or medical assessment.
Plain-English one-pager you can print or hand to a patient. Free, no sign-in needed.
Lifestyle & Diet
- •Follow the patient's ASCIA Action Plan or other prescribed emergency plan when a serious allergic reaction is suspected.
- •Use the prescribed adrenaline device immediately for anaphylaxis and call emergency services; do not wait to see whether antihistamines work.
- •Second-generation, non-sedating oral H1 antihistamines are the principal medical treatment for uncomplicated urticaria and should be used according to clinician or pharmacy advice.
- •Do not exceed labelled or prescribed antihistamine doses without medical supervision.
- •Avoid driving, alcohol or hazardous activity when taking a sedating antihistamine.
- •Use cool or lukewarm showers, loose clothing and cool compresses to reduce itching.
- •Avoid scratching; keep fingernails short if excoriation is occurring.
- •Temporarily avoid overheating, hot showers, saunas and strenuous exercise if these worsen symptoms.
- •Avoid a clearly identified or strongly suspected trigger pending medical advice, but do not undertake broad elimination diets without a documented reason.
- •Record foods, medicines, supplements, infections, insect stings, exercise, alcohol, NSAID exposure and timing of symptoms to help identify reproducible triggers.
- •Do not stop essential prescribed medicines abruptly; seek urgent medical advice when a medicine reaction is suspected.
- •NSAIDs, alcohol, heat and tight clothing may aggravate urticaria in some patients.
- •Do not deliberately re-expose yourself to a suspected allergen to confirm the diagnosis.
- •Seek medical review when lesions are painful, fixed beyond 24 hours, bruise, blister or involve the mouth or eyes.
- •Seek reassessment when symptoms persist, recur frequently or continue beyond six weeks.
- •Patients treated for anaphylaxis require appropriate observation, discharge planning, trigger investigation and follow-up according to current emergency standards.
Cautions & Contraindications
- •Do not treat suspected anaphylaxis with acupuncture, acupressure, herbs, antihistamines or corticosteroids instead of adrenaline.[,,]
- •Do not delay calling emergency services when airway, breathing or circulation symptoms are present.[,,]
- •Do not allow a patient with suspected anaphylaxis to stand or walk.[,]
- •Do not give oral herbs, food, fluids or tablets to a person with throat swelling, severe breathing difficulty, reduced consciousness or unsafe swallowing.[,]
- •Do not needle directly into acute wheals, angioedema, blistered skin, mucosal lesions or suspected infected tissue.[]
- •Avoid moxibustion, heat lamps and hot topical applications when heat aggravates the eruption.[]
- •Do not conduct unsupervised food, medicine, cold, heat, exercise or insect-allergy challenges.[,,]
- •Do not advise broad food elimination without a supported diagnosis or nutritional oversight.[,]
- •Do not advise abrupt discontinuation of essential prescribed medication; suspected drug reactions require prompt prescriber or emergency review.[,]
- •Avoid strong Blood-moving herbs where pregnancy, active bleeding, thrombocytopenia, recent surgery or anticoagulant therapy is present.
- •Mù Tōng must be botanically verified and free of aristolochic acid.
- •Bàn Xià must be correctly processed; raw Bàn Xià is toxic.
- •Hé Shǒu Wū may cause serious liver injury and requires careful risk assessment.
- •Xìng Rén or other cyanogenic herbs require professional dosing when included in modified formulas.
- •Screen insect- and animal-derived ingredients such as Chán Tuì or Jiāng Cán for allergy, ethical acceptability and legal status.
- •Screen every herbal prescription for pregnancy, breastfeeding, age, weight, hepatic or renal disease and interactions with antihistamines, corticosteroids, anticoagulants and other medicines.
- •Do not use adult herbal doses in infants or children.
- •Do not classify fixed, painful, bruising or non-blanching lesions as ordinary Wind rash without medical assessment.[]
- •Do not assume urticaria is allergic in every case; infection, physical triggers and idiopathic mechanisms are common.[,,]
- •Do not assume that disappearance of wheals means that a systemic allergic reaction has fully resolved.[,]
When to reassess or seek care again
- •Reassess within 24–48 hours for any suspected anaphylaxis, biphasic reaction risk, or new-medicine reaction; ensure the patient has a written ASCIA Action Plan and adrenaline device before discharge.[,]
- •Review at 3–7 days if wheals are still occurring daily — reconsider triggers (recent viral illness, NSAIDs, antibiotics, foods) and adjust antihistamine dose within licensed limits.[,]
- •Reassess at 6 weeks — persistent or recurrent wheals beyond this point are reclassified as chronic urticaria and warrant specialist allergy or dermatology review.[,]
- •Urgent review at any point for angioedema of the tongue, throat or floor of mouth, new breathing difficulty, hypotension, blistering, mucosal involvement or fixed painful lesions.[,]
- •Review TCM pattern every 1–2 weeks during the acute phase; shifts from Wind-Heat to Damp-Heat, Blood Heat or Qì-Blood deficiency require a change in point and formula strategy.
- •Repeat exposure to identified food, medicine (particularly NSAIDs, antibiotics, opiates, contrast media), insect sting or contact allergen.[,,]
- •Viral or bacterial infection, especially in children — a common trigger for acute urticaria.[,]
- •Physical triggers: heat, cold, pressure, exercise, sunlight, water or vibration.[,,]
- •Alcohol, overheating, hot showers, tight clothing and emotional stress (Wind-Heat, Blood Heat, Liver constraint).[,]
- •Constitutional Qì-Blood deficiency, post-partum, post-illness or fatigue states with reduced defensive Qì.
Standing daily second-generation antihistamines (up-titrated to 4× licensed dose under specialist guidance) remain the medical mainstay; TCM is adjunctive and pattern-led.
Frequently Asked Questions
What is acute urticaria?+
Acute urticaria is the sudden development of transient itchy or burning wheals lasting less than six weeks. Individual wheals usually resolve within 24 hours, although new ones may appear elsewhere [1].
Is acute urticaria always an allergy?+
No. Acute urticaria may follow infection, medicines, foods, insect stings, contact or physical triggers, and the cause often remains uncertain [1].
When do hives indicate anaphylaxis?+
Hives may indicate anaphylaxis when accompanied by difficult or noisy breathing, wheeze, persistent cough, tongue or throat swelling, voice change, dizziness, collapse, hypotension or severe gastrointestinal symptoms after likely allergen exposure [1].
What is the first-line treatment for anaphylaxis?+
Adrenaline is the first-line treatment. Antihistamines, corticosteroids, acupuncture and herbal medicine must not delay it [8].
What is the main medical treatment for uncomplicated acute urticaria?+
A second-generation, non-sedating H1 antihistamine such as cetirizine or loratadine is generally the principal treatment, used according to clinician or pharmacy advice [1].
What are common TCM patterns for acute urticaria?+
Common traditional patterns include Wind-Heat, Wind-Cold, Damp-Heat, Blood Heat generating Wind, food accumulation with Stomach Heat and Qì-Blood deficiency with Wind susceptibility [8].
Which acupuncture points are commonly considered?+
Commonly considered points include LI11, SP10, LI4, SJ5, GB20, SP6, ST36 and pattern-specific points. Acupuncture is appropriate only after anaphylaxis and serious skin reactions have been excluded [8].
Can acupuncture or herbs replace antihistamines or adrenaline?+
No. They are adjunctive only. They must not replace medically recommended antihistamines for uncomplicated urticaria or adrenaline and emergency care for anaphylaxis [8].
When should urticaria be investigated further?+
Medical assessment is warranted when lesions persist in one location beyond 24 hours, bruise, blister, cause pain, involve mucous membranes, recur with a particular trigger or continue for more than six weeks [1].
Are elimination diets useful for unexplained urticaria?+
Broad elimination diets are usually not recommended without a reproducible trigger or specialist rationale because they may be unhelpful and nutritionally restrictive [1].
Explore more diseases
Sources & Further Reading
Clinical guidance, red flags and safety notes on this page draw on the following current sources alongside the classical references above.
- Australasian Society of Clinical Immunology and Allergy · 2024
Australian and New Zealand emergency guidance identifying adrenaline as first-line treatment and outlining positioning, repeat dosing and escalation for anaphylaxis.
- Australian Commission on Safety and Quality in Health Care · 2026
Current Australian standard for recognition, emergency treatment, observation, discharge planning and follow-up after acute anaphylaxis.
- NSW Agency for Clinical Innovation, Emergency Care Institute · 2026
Australian emergency-care guidance confirming that anaphylaxis is life-threatening and adrenaline is first-line treatment.
- DermNet · 2025
Clinical features, causes and treatment of acute urticaria, including antihistamines and the restricted role of adrenaline for anaphylaxis or throat swelling.
- DermNet · 2025
Definition, classification and second-generation H1-antihistamine management of urticaria.
- Royal Children's Hospital Melbourne · 2026
Australian paediatric referral guidance, trigger avoidance and caution against broad elimination diets.
- Allergy · 2022
International evidence-based classification, diagnosis and stepped treatment guidance for urticaria.
- World Health Organization · 2008
Standardised acupuncture-point nomenclature and anatomical location methodology.
Educational reference for licensed practitioners. Not a substitute for individual clinical assessment. Refer to conventional care for any red-flag or undiagnosed presentation.