Hives (Urticaria): Causes, Symptoms, and How to Treat Them

Hives can appear suddenly and cause real distress. Learn the causes, symptoms, treatment options, and when to see a dermatologist.

Hebra Editorial Team

Hebra Journal

April 12, 20265 min read

If you've ever noticed raised, itchy welts suddenly appearing on your skin, you may have experienced hives. Known medically as urticaria, hives are one of the most common skin conditions in the UK, affecting around 15% of people at some point in their lives. While they're usually harmless and short-lived, hives can be distressing, uncomfortable, and in chronic cases significantly affect your quality of life.

In this guide, we'll walk you through what causes hives, the symptoms to look out for, how they're treated, and when it's time to seek specialist help.

What Are Hives and What Causes Them?

Hives are raised, itchy patches on the skin, often called wheals or welts, that can vary in size from a few millimetres to several centimetres. They're caused by the release of histamine from mast cells in the skin, which triggers swelling, redness, and that characteristic itch.

So what triggers that histamine release? The causes of hives are wide-ranging and sometimes surprising:

Allergic reactions such as foods like shellfish, nuts, or eggs, medications like antibiotics or NSAIDs, or insect stings.
Infections including viral infections, which are one of the most common triggers, particularly in children.
Physical factors such as heat, cold, pressure, sunlight, or even exercise, which can provoke a type known as inducible urticaria.
Stress because emotional stress is a well-recognised trigger that can cause or worsen outbreaks.
Contact triggers including latex, certain plants, or chemicals that come into direct contact with the skin.

For around 40 to 50% of people with hives, no specific cause is ever identified. This is known as idiopathic urticaria, and while it can be frustrating not to have a clear answer, the good news is that effective treatments are still available.

Related read: Understanding skin rash types

Hives Symptoms: What to Look For

Hives typically appear as smooth, raised bumps or patches on the skin that are pink or red on lighter skin tones, and may appear slightly darker or the same colour as the surrounding skin on darker skin tones. Key symptoms include:

Itching which is usually the most prominent and bothersome symptom, ranging from mild to intense.
Swelling as individual wheals can merge into larger areas of swollen skin.
A blanching centre because pressing on a hive often causes the centre to turn white.
Rapid appearance and disappearance since individual wheals usually fade within 24 hours, though new ones may appear elsewhere.

In some cases, hives can occur alongside angioedema, a deeper swelling beneath the skin that commonly affects the lips, eyelids, hands, or feet. If you experience swelling of the throat, tongue, or difficulty breathing alongside hives, seek emergency medical attention immediately, as this could indicate a severe allergic reaction called anaphylaxis.

Acute vs Chronic Hives: Understanding the Difference

Doctors classify hives based on how long they last. Acute urticaria lasts less than six weeks and is by far the most common type. It often resolves on its own within days and is frequently linked to an identifiable trigger such as an infection or allergic reaction.

Chronic urticaria, on the other hand, involves symptoms that persist or recur for more than six weeks. The lifetime prevalence of chronic urticaria in the UK is estimated at 0.5 to 1%, and it can have a significant impact on daily life. Research has shown that people living with chronic hives are more likely to experience psychological effects, including anxiety and depression, making early and effective management all the more important.

Related read: Managing skin conditions and mental wellbeing

How Are Hives Treated?

The good news is that most cases of hives respond well to treatment. Here's what to expect at each stage:

Self-care measures include applying cool compresses, wearing loose clothing, and avoiding known triggers to help manage mild symptoms. Keeping a diary of when outbreaks occur can help you identify patterns and potential triggers.

First-line treatment: Antihistamines are usually non-drowsy, second-generation antihistamines such as cetirizine, loratadine, or fexofenadine. These work by blocking the histamine that causes the symptoms. In the UK, these are available over the counter from pharmacies. For chronic cases, doctors may prescribe higher doses, up to four times the standard dose, which evidence suggests is both safe and effective for many patients.

Second-line options come into play when antihistamines alone aren't enough. A GP may add a leukotriene receptor antagonist such as montelukast. If symptoms still persist, referral to a dermatologist or immunologist opens the door to specialist treatments including omalizumab (Xolair), a biologic therapy approved by NICE specifically for chronic spontaneous urticaria that doesn't respond to antihistamines.

When to see a doctor is when your hives last more than a few days, keep returning, are affecting your sleep or daily life, or if you've been taking antihistamines continuously for more than six weeks without adequate control.

When to See a Dermatologist for Hives

Getting a referral to a dermatologist can be a turning point for people struggling with chronic or severe hives. A specialist can carry out detailed assessments, rule out underlying conditions, and access advanced treatments that aren't available through a GP.

However, NHS dermatology waiting times remain a challenge. In many parts of the UK, patients can wait anywhere from 8 weeks to over 18 months for a specialist appointment. That's valuable time spent managing symptoms without expert guidance.

This is where digital health tools can make a real difference. Rather than waiting months to be seen, you can get your skin assessed quickly and connected with a dermatologist sooner.

Related read: Reducing dermatology wait times

Take Control of Your Skin Health with Hebra

Hives can be unpredictable and unsettling, but you don't have to navigate them alone. Whether you're dealing with a one-off outbreak or ongoing chronic urticaria, getting the right assessment early can help you find relief faster.

Hebra is a skin health triage app designed to help you understand your skin condition and connect you directly with a dermatologist without the long wait. Simply upload a photo of your skin concern, receive an initial assessment, and get expert guidance on your next steps.

Don't let hives hold you back. Visit www.hebra.health today and take the first step towards clearer, calmer skin.