What are hives
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Understanding Hives: Causes, Symptoms, and Implications
What Are Hives? (Urticaria)
Hives, medically known as urticaria, are raised, red, and itchy patches of skin that appear suddenly and can vary in size and shape. These patches, also called wheals, can be as small as a pencil tip or cover large areas of the body. They are typically oval or round but can merge to form larger hives 1Simonyan2014. Hives are usually 1 to 2 cm in size but can grow larger and sometimes combine with nearby hives .
Symptoms and Appearance
Hives are characterized by their red or pale color and intense itchiness. They can cause stinging or pain and may appear anywhere on the body, including the face, lips, tongue, throat, and ears Simonyan2014Lee2020. The welts often have a pale border and can range from 5 mm to the size of a dinner plate . Hives can last from 24 hours to a few days before disappearing without a trace .
Causes and Triggers
Hives are commonly caused by allergic reactions, but they can also result from non-allergic triggers such as stress, infections, or physical stimuli like pressure, temperature changes, or sunlight 1Lee2020. In some cases, hives occur with deeper skin inflammation, leading to painful swelling .
Chronic Urticaria and the Gut-Skin Axis
Chronic urticaria (CU) is a form of hives that persists for more than six weeks without a specific trigger. The exact cause of CU is often unclear, but recent research suggests a link between gut microbiota dysbiosis and the development of CU. Studies have shown that CU patients have a significant decrease in beneficial gut bacteria and an increase in harmful bacteria, which may lead to inflammation and impaired gut barrier function, contributing to inflammatory skin diseases .
Serious Allergic Reactions
While hives usually affect only the skin, they can sometimes be part of a more severe allergic reaction. Symptoms of a serious allergic reaction include dizziness, stomach cramps, swelling, and difficulty breathing. Immediate medical attention is required if these symptoms occur .
Conclusion
Hives are a common and often uncomfortable skin condition characterized by red, itchy welts. They can be triggered by various factors, including allergies and stress. Chronic urticaria, a persistent form of hives, may be linked to gut microbiota imbalances, highlighting the importance of gut health in managing this condition. If hives are accompanied by severe symptoms, it is crucial to seek emergency medical care.
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