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Hives, also known as urticaria, are raised, itchy welts on the skin that can appear suddenly and often without warning. While many people immediately think of allergies to foods or medications, the true causes of hives are surprisingly varied — and sometimes unexpected. Understanding potential triggers can help you prevent flare-ups and protect your skin.
1. Stress and Anxiety
2. Temperature Changes
Cold air, hot showers, or sudden temperature swings can provoke hives. Some people develop cold-induced urticaria, where exposure to chilly temperatures causes itching and swelling. Conversely, heat or sweating can trigger cholinergic urticaria, a type of hives that appears after exercise or exposure to high temperatu
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