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Jan
How Long Do Hives From An Allergic Reaction Last. In rare cases allergic reactions can be fatal. The medical name for hives is urticaria. These are hives that last less than 6 weeks. Check if you have hives Hives can be raised red patches.
4 If you have chronic hives however the hives will last for longer than six weeks. Chronic Hives and Angioedema Chronic hives and angioedema are usually diagnosed when. Each hive lasts less than 24 hours. Quite often a second round of severe symptoms which people call a biphasic reaction will occur several hours later. This is known as acute hives. They do not bruise nor leave any scar.
In most cases the hives will go away in a few days or weeks but for some people things are a bit more complicated.
Skin symptoms can last for days to even a few weeks or rarely even longer. Even with adequate treatment some allergic reactions may take two to four weeks to go away. Typically hives due to a medication will last for only a few days. Usually this type of hives is caused by food or drug reactions. If the exposure to the allergen continues such as during a spring pollen season allergic reactions may last for longer periods such as a few weeks to months. Allergies can occur from the tiniest drop to binge drinking levels.