Hives and Swelling (Urticaria and Angioedema)

Hives (urticaria) are raised, itchy patches or welts that can appear suddenly on the skin. Angioedema is deeper swelling, often affecting the lips, eyelids, face, hands, feet, or other areas. Hives and angioedema can occur together or separately and may range from mild to severe. At Allergy & Asthma Physicians of Commerce Township, we help patients with hives and swelling find possible triggers and get symptoms under control at our Commerce Township and Mount Clemens offices.

What Causes Hives and Angioedema?

There are many possible causes of hives and swelling. Common triggers include:

• Foods: Certain foods, including nuts, shellfish, eggs, milk, or other foods, can cause allergic reactions.
• Medications: Antibiotics, aspirin, NSAIDs, and other medicines may trigger hives or angioedema in some people.
• Insect stings: Bee, wasp, and other insect stings can cause an allergic reaction.
• Infections: Viral or bacterial infections can sometimes trigger hives.
• Unknown or chronic causes: In many people with chronic hives, no specific trigger is identified. Chronic spontaneous urticaria can continue for weeks or months without an obvious cause.

How Are Hives and Angioedema Diagnosed?

Diagnosis usually starts with a detailed medical history and examination. We may ask when the hives or swelling began, how long individual episodes last, possible triggers, medications you take, and whether you have experienced breathing problems or other allergic symptoms. Testing may be recommended when your history suggests a specific allergy or another underlying condition.

Treatment for Hives and Angioedema

Treatment depends on the cause and severity of your symptoms. Antihistamines are commonly used to reduce itching and hives. We may recommend other medications when appropriate.

For people with chronic hives that do not respond adequately to antihistamines, biologic therapy may be an option. Our team can determine whether a biologic medication is appropriate based on your symptoms and treatment history.

How Long Do Hives Last?

Individual hives often fade within 24 hours, although new welts may appear as older ones disappear. Acute hives may last days to several weeks. When hives continue or repeatedly occur for more than six weeks, they are generally considered chronic urticaria and may require ongoing treatment.

Self-Care and Prevention

Try to identify and avoid known triggers when possible. Keep track of foods, medications, infections, activities, or other exposures that occur before symptoms. Take medications exactly as directed, and avoid scratching irritated skin. If you have experienced a serious allergic reaction, ask us about an emergency action plan.

When Is Swelling an Emergency?

Swelling of the lips, tongue, or throat, trouble breathing, or difficulty swallowing can be signs of a serious allergic reaction. Call 911 immediately. Do not wait for symptoms to improve on their own.

You can also see all the allergy conditions we treat.

Medically reviewed by Pulin P. Patel, DO, FACAAI