I called her dr and they told me to give her benadryl. Acute hives. Yesterday she broke out in, what I think, is hives. This type of hive breakout will only be expected to last for 6-36 hours. Now for many people, the time of how long does Hives last varies from few hours to half a day. They normally fade within 24-48 hours, although some cases of acute hives can last for several weeks. The rash typically lasts one to two days. It generally lasts longer than hives, but the swelling usually goes away in less than 24 hours. So I threw the can out and thought that was the end of it. A “Hive” can house honey bees for many MANY years straight. In children, episodes tend to emerge within 15 minutes to a few hours. How Long Do Hives Last? Exactly how long do hives last? Acute hives (sometimes called acute urticaria or acute spontaneous urticaria) are hives that appear suddenly, and then fade away on their own. They typically do not have an identifiable trigger. They may arise and subside in waves. They do not bruise nor leave any scar. Each hive lasts less than 24 hours. And about 20% of world’s population becomes a victim of this annoying disease at one or other point of their lives. The best thing about hives is that even though it is very annoying and irritating, the medicines are very effective to it. How long do hives last? How long do hives last in children? The most common form of hives, also being the most simplistic is called Acute Urticaria. Colonies swarm, entirely new colonies replace old ones. Updated on June 29, 2008 L.C. asks from Langhorne, PA on June 25, 2008 11 answers. If you have been diagnosed with having chronic hives, you may be dealing with this problem way longer than you could imagine. It just appears and disappears on its own. For example, welts may first appear on a child’s stomach and vanish within an hour, replaced by new ones on their back. It generally lasts longer than hives, but the swelling usually goes away in less than 24 hours. However, the next morning the poor guy was covered in hives. What are the different types of hives -- and how long do they last? Well that depends on a few factors. My 10 month old daughter had some red spots on her on Monday which I thought were mosquito bites since we had gone on a walk Sunday evening. Queens are replaced with young virgin queens and so it goes. The store was out of the canned food I usually give my 3.5 year old lab mix, so I bought one can of a different kind (same brand) and within an hour of eating it he threw all of it up. Rarely, angioedema of the throat, tongue , or lungs can block the airways, causing difficulty breathing. If your hives last more than a month or if they recur over time, see an allergist, who will take a history and perform a thorough physical exam to try and determine the cause of your symptoms. 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