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If a medication is suspected as the trigger, your allergist can conduct similar tests, and a cautious drug challenge - similar to an oral food challenge, but with medications - may also be needed to confirm the diagnosis.Because of the possibility of anaphylaxis, a life-threatening allergic reaction, these challenge tests should be done only under strict medical supervision, with emergency medication and equipment at hand.

Researchers have identified many - but not all - of the factors that can cause hives.

These include food and other substances you take, such as medications.

But it’s just to say that it is possible to see any or, unfortunately sometimes, even all systems in the body affected by the disease.

That doesn’t say, of course, that every system will be affected by the disease.

This will help you discover whether there is a link between what you’re eating and when you break out with hives.

Chronic hives should be evaluated by an allergist, who will ask about your and your family’s medical history, substances to which you are exposed at home and at work, exposure to pets or other animals and any medications you’ve taken recently.These can be early symptoms of anaphylaxis, a potentially fatal allergic reaction that impairs breathing and can send the body into shock. If you develop hives and your injector is not nearby - or if using the auto-injector doesn’t cause the symptoms to immediately improve - go to an emergency room immediately.You should also go to the emergency room after using an auto-injector.Neither is typically life-threatening, though any swelling in the throat or any other symptom that restricts breathing requires immediate emergency care. 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 determine the cause of your symptoms.Chronic hives occur almost daily for more than six weeks and are typically itchy. A skin test and challenge test may also be needed to identify triggers.If the cause of hives can be identified, the best treatment is to avoid the trigger or eliminate it: Some cases of hives last for more than six weeks and can last months or years. If the cause cannot be identified, even after a detailed history and testing, the condition is called chronic idiopathic urticaria.

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