Urticaria, or hives, is a condition in which red, itchy, raised areas appear on the skin. Urticaria may last for a short or long time. If it lasts for a short time, the cause is usually an allergic reaction from eating certain foods or taking certain medicines. When urticaria is long-term, the cause is often unknown. Hives vary in size and may come and go. Hives can affect most of the body or just a small area.
Hives are a common reaction to allergies to the following foods:
Hives are a common reaction to allergies to the following medicines:
Other types of hives include:
Angioedema is an allergic reaction that causes swelling in the deeper layers of skin; it sometimes happens with hives. It's most common in the hands, feet, and face (lips, tongue, and eyes). Angioedema can be serious and may need immediate medical attention. This is especially true if there is swelling of the tongue, lips, and/or throat. A person who has angioedema may feel as if his or her throat is closing up, making it difficult to breathe.