Urticaria

What is Urticaria?

Urticaria is the medical term for hives. These are raised, itchy welts that appear on your skin. They can be red, pink, or skin-colored and range from small spots to large patches.

Hives happen when your body releases histamine in response to a trigger. Histamine is a chemical that causes blood vessels to leak fluid into the skin. This creates the swollen, itchy bumps you see and feel. Urticaria can appear anywhere on your body and often moves around or changes shape.

Most cases of urticaria are acute, meaning they last less than 6 weeks. Chronic urticaria lasts longer than 6 weeks and may come and go for months or years. While hives can be uncomfortable, they are usually not dangerous unless they occur with breathing problems or swelling in the throat.

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Symptoms

Raised, itchy welts or bumps on the skin
Red, pink, or flesh-colored patches that blanch when pressed
Welts that vary in size and shape
Hives that appear suddenly and move to different areas
Swelling of the lips, eyelids, or throat in severe cases
Burning or stinging sensation on the skin
Welts that fade within hours but new ones appear

Some people experience hives only once, while others have recurring episodes. The welts typically last a few hours before fading, but new ones may continue to appear.

Causes and risk factors

Urticaria happens when something triggers your immune system to release histamine. Common triggers include foods like nuts, shellfish, eggs, and berries. Medications such as antibiotics, aspirin, and pain relievers can also cause hives. Insect stings, latex, and contact with plants like nettle are physical triggers. Infections, stress, temperature changes, and pressure on the skin can set off hives too.

Allergic reactions to substances like pollen, pet dander, or mold may lead to urticaria in sensitive individuals. In many cases of chronic urticaria, no specific trigger can be identified. This is called chronic idiopathic urticaria. Autoimmune conditions, thyroid problems, and underlying inflammation can contribute to persistent hives. Understanding your specific triggers helps you avoid future episodes.

How it's diagnosed

Doctors diagnose urticaria by examining your skin and asking about your symptoms. They will want to know when the hives started, how long they last, and what you were doing or eating before they appeared. A detailed history helps identify potential triggers.

For chronic or severe urticaria, your doctor may recommend allergy testing. Blood tests can check for specific IgE antibodies that indicate allergic reactions to substances like nettle, foods, or environmental allergens. Skin prick tests may also be used to identify triggers. Talk to a doctor about specialized testing if you experience frequent or persistent hives. They can help determine if allergy testing would be beneficial for your situation.

Treatment options

Avoid known triggers once identified through testing or observation
Take antihistamines to block histamine and reduce itching and swelling
Apply cool compresses or take cool baths to soothe irritated skin
Wear loose, breathable clothing to avoid pressure on the skin
Manage stress through relaxation techniques and adequate sleep
Use prescribed corticosteroids for severe cases under medical supervision
Consider biologics like omalizumab for chronic urticaria that does not respond to antihistamines
Keep a symptom diary to track patterns and identify potential triggers

Frequently asked questions

Acute urticaria lasts less than 6 weeks and often has an identifiable trigger like food or medication. Chronic urticaria persists for more than 6 weeks and may have no clear cause. Both types cause itchy welts, but chronic cases require more extensive evaluation and long-term management strategies.

Yes, stress can trigger or worsen urticaria in many people. Emotional stress causes your body to release chemicals that can lead to hives. Managing stress through relaxation techniques, exercise, and adequate sleep may help reduce the frequency and severity of stress-related hives.

Individual hives usually fade within a few hours, often in less than 24 hours. However, new welts may continue to appear as old ones disappear. Acute urticaria episodes typically resolve within days to weeks, while chronic urticaria can persist for months or years with recurring symptoms.

No, hives are not contagious. You cannot catch urticaria from another person or spread it to others. Hives are a reaction happening inside your own body, triggered by your immune system releasing histamine in response to various stimuli.

Common food triggers include nuts, shellfish, fish, eggs, milk, soy, wheat, and berries. Food additives and preservatives can also cause reactions in some people. Keeping a food diary can help identify which foods trigger your hives so you can avoid them in the future.

Most people with urticaria can exercise safely. However, some individuals have exercise-induced urticaria, where physical activity triggers hives. If exercise causes your hives, talk to your doctor about prevention strategies like taking antihistamines before working out or modifying your activity level.

Seek immediate medical attention if you develop difficulty breathing, swelling of the tongue or throat, dizziness, or rapid heartbeat along with hives. These symptoms may indicate anaphylaxis, a severe allergic reaction that requires emergency treatment. Regular hives without these symptoms can be evaluated by your primary care doctor.

Allergy testing can include blood tests that measure IgE antibodies to specific allergens like nettle, foods, or environmental triggers. Skin prick tests involve placing small amounts of allergens on your skin to see if a reaction occurs. Your doctor will recommend the appropriate tests based on your symptoms and suspected triggers.

Acute urticaria often resolves on its own once the trigger is removed or the body clears the irritant. Chronic urticaria is more challenging and may not have a cure, but symptoms can be effectively managed with medication and trigger avoidance. Many people with chronic urticaria eventually experience spontaneous remission after several months or years.

Antihistamines block the effects of histamine, the chemical that causes hives to form. They reduce itching, swelling, and the formation of new welts. Many people with chronic urticaria take daily antihistamines to prevent symptoms. Your doctor may recommend higher doses or prescription-strength antihistamines for better control of persistent hives.