Hives (Urticaria): Triggers and Warning Signs

Hives, or urticaria, are raised, reddish, itchy welts that can shift location within hours. This condition occurs due to the release of histamine in the skin, which causes small blood vessels to widen and fluid to leak into the surrounding tissue.

Hives have a wide range of triggers, including food allergies such as seafood, eggs, or nuts, insect bites, certain medications, and infections. Physical factors such as cold air, heat, pressure on the skin, sweat, and stress can also trigger welts in some people. For hives that last longer than six weeks, the cause is often difficult to find.

To relieve mild symptoms, you can apply a cold compress to the skin, wear loose clothing, avoid scratching, and keep a record of possible triggers so you can avoid them in the future.

Seek medical help immediately if hives are accompanied by swelling of the lips, eyelids, or tongue, shortness of breath, a hoarse voice, dizziness, or weakness, as these may signal a severe allergic reaction. If your hives keep coming back, consult a doctor.