DefinitionHives are small, itchy, red swollen areas on the skin. The swelling occurs singularly or in clusters. Hives tend to fade after a few hours, but new ones can appear. Most cases go away within a few days. However, some last a few weeks or longer.
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CausesHives are often caused when the body releases a chemical called histamine. Histamine is released during an allergic reaction. Many people, though, get hives without being exposed to something they are allergic to.While the cause is unknown in some cases, these factors may cause hives:
- Foods , most commonly:
- Fresh berries
- Reaction to allergy shots (desensitization shots)
- Insect bites or stings
- Cold or heat
- Underlying medical conditions:
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