First Aid & Emergencies

Hives and Angioedema Treatment

See Severe Allergic Reaction Treatment.

1. Avoid the Trigger

• Hives and angioedema that happen suddenly are usually triggered by an allergic reaction to a food, drug, infection, or insect bite or sting.

• If you know what the trigger is, keep the person away from it.

2. Control Itching and Swelling

• Give an adult an over-the-counter antihistamine. Check with a doctor before giving an antihistamine to a child.

• Put a cool compress on the area or have the person take a cool shower.

• Avoid strong soaps, detergents, and other chemicals that can make itching worse.

3. Follow Up

• It may take days for the trigger substance to leave the body. Continue home treatment until symptoms subside.

• If symptoms persist, or to identify the allergen that caused the hives, see a doctor.