![]() Sometimes medications such as steroids, antileukotrienes, and cyclosporine are needed to control hives. Very commonly patients are given a few antihistamines at a time to treat the hives. There are many different antihistamines that are used to treat hives. The specific cause of hives is rarely identified. It is rare for a food to cause chronic hives. In some cases you may require tests to analyze blood and urine. This specialist will take a detailed personal medical history, familys’ medical history, and medication history. If allergy is suspected, a diary of foods eaten within a few hours before the hives started may be extremely helpful.Ĭhronic urticaria should be evaluated by an Allergist/Immunologist. If the reaction involves respiratory symptoms, such as coughing, shortness of breath, throat closing or tongue swelling, then the patient should be immediately brought to the emergency department. A single episode of uncomplicated hives does not usually need extensive testing. ![]() Some cases require a more detailed history from an Allergist to help figure out the cause. A person ingests nuts or fish, and then develops hives within a few minutes or possibly a couple of hours. Most often, the rash is linear, following the path taken by the act of scratching. Delayed pressure urticaria is swelling that appears on areas of constant pressure from belts and constricting clothing such as sock bands. Cold urticaria (from exposure to low temperature followed by re-warming) can be severe and life threatening if there is a generalized body cooling, for example after a plunge into a swimming pool. Cholinergic urticaria is due to an increase in body temperature with sweating, exercise, hot showers, and/or anxiety. Sun-induced urticaria may occur within a few minutes after exposure to the sun. These hives appear within a few minutes of scratching along an area of skin. The most common reason for long-lasting hives is dermographism. Physical urticaria is due to one or more "physical" causes. In most cases of chronic urticaria, the hives will gradually disappear over time. Rarely, chronic urticaria has been associated with cancer. Even though hives are associated with other autoimmune conditions such as thyroid disease, treating the other condition doesn’t cure the hives. This triggers chemicals such as histamine to be released which causes the hives and itching. Half of the patients have antibodies (proteins) that attack the mast cell (allergy cell). In most cases, the cause of chronic hives will not be identified despite testing. In most of these cases, when the reason for hives is removed or avoided, the hives resolve.Ĭhronic episodes of urticaria last more than six weeks. Infections causing hives include the common cold, and other viral infections. Medications such as aspirin and antibiotics (especially penicillin and sulfa) also are common causes of hives. Foods such as eggs, nuts and shellfish are common causes of urticaria. ![]() The most common cause of hives is infections. Acute urticaria can be due to infections foods, medications, insect stings, blood transfusions and infections. What are the different types of hives?Īcute episodes of urticaria last for six weeks or less. ![]() Most individual hives last no more than 24 hours. Usually, eruptions may last for a few minutes, sometimes several hours, and even several weeks to months. Hives can last a variable amount of time. The condition affects an estimated 20 percent of the population at one time or another in their lives. Foods, medications, infections, exercise, scratching, alcoholic beverages, emotional stress and many other factors may worsen hives. Hives or urticaria are a type of rash consisting of itchy, swollen, red welts. ![]()
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