Hives (Urticaria): Causes, Treatment & UK Online Doctor
Educational information — not medical advice.
This article was prepared by the OnlineDoctor24 editorial team and reviewed for factual accuracy against UK clinical guidance (NHS and NICE). It is not written by a doctor and does not replace personal medical advice. For symptoms specific to you, book an online doctor consultation.
Key points
- Hives are itchy raised welts that appear and disappear within 24 hours.
- Acute hives usually settle within a few weeks; chronic urticaria lasts more than 6 weeks.
- Non-drowsy antihistamines are first-line — up to 4× standard dose under medical supervision.
- Severe cases may need oral steroids or specialist treatment.
- Watch for face/lip swelling or breathing difficulty — that's an emergency.
What causes hives?
- Viral infections (most common in children)
- Foods (nuts, shellfish, eggs)
- Medications (NSAIDs, antibiotics)
- Insect bites
- Heat, cold, pressure, sunlight (physical urticaria)
- Often no cause is found, especially in chronic cases.
Treatment
- Non-drowsy antihistamine (cetirizine, loratadine, fexofenadine) at standard dose.
- Doses can be increased up to 4× under medical supervision.
- Oral steroids briefly for severe acute attacks.
- Specialist options (omalizumab) for chronic refractory cases.
When an online doctor can help
An online GP can review your hives, prescribe high-dose antihistamines, manage flare treatment and refer to immunology if chronic.
Red flags — when to seek urgent help
Call 999 or go to A&E if you experience any of the following:
- Swelling of lips, tongue, throat (angioedema)
- Difficulty breathing or swallowing
- Dizziness or feeling faint
- Widespread rash with fever or feeling unwell
Frequently asked questions
Common questions UK patients ask about urticaria (hives).
How an online doctor can help
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This article is for general information only and does not replace personal medical advice from a qualified doctor. Content is reviewed against UK NHS and NICE guidance by the OnlineDoctor24 editorial team and is not authored by a medical doctor. If your symptoms worsen or you are unsure, please book a consultation with a GMC-registered GP.
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