Wednesday, April 16, 2008

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HIVES
AVOID
1. foods that have previously caused hives or other allergic reactions
2. foods and medications colored with Yellow No.5 (tartrazine) if you are sensitive to this additive.
3. Foods that contain salicylate if you are allergic to aspirin

Medically known as urticaria, hives are the itchy red welts that develop as a result of reactions to foods and other provoking substances. For example, certain medications- aspirin, as well as penicillin and related antibiotics-can cause hives in some people. Even those without known allergies can develop hives after being stung by an insect or touching stinging plants, such as nettles, poison oak, or poison ivy. Hives may be accompanied by other symptoms of allergy, including swelling of the eyes and other parts of the body. Many food allergies provoke swelling and itching of the lips and mouth.

WARNING
If hives are accompanied by swelling of the throat and difficulty breathing, speaking, or swallowing, seek immediate medical help. These symptoms may signal anaphylaxis, a potentially fatal medical emergency.

WELL-KNOWN CAUSES OF HIVES
The blotchy rash of hives can follow ingestion of almost any food, but among the most common causes are shellfish, nuts, and berries. A person who is allergic to aspirin should also be wary of foods that contain natural salicylates. Among the other well-known triggers of hives are emotional stress; exposure to sunshine, heat, or cold and viral infections.
Hives generally develop within hours after exposure to a trigger, but in unusual cases, they may appear several days later. This delayed reaction can make it difficult to identify the offending substances. Delayed reactions are most common with medications; if you develop a rash while taking any drug, report it to your doctor immediately. Medication-related rashes usually start around the head and spread progressively downward. Sometimes a drug allergy develops abruptly after months or even years of taking a medication. Always mention your sensitivity to the pharmacist and any doctor who may prescribe medications for you.

CHECK FOOD LABELS TO AVOID TARTRAZINE
Although food additives are often blamed for causing allergic reactions, only tartrazine *Yellow No.5), a common coloring agent, has been found to cause hives- and in fewer than 1 out of 10,000 people. All product labels must list food colorants; people who are sensitive to tartrazine should read labels on food products, medications, and vitamin supplements.

DEALING WITH HIVES
An outbreak of hives may fade within minutes or persist for days or weeks. If you can link a particular food to hives, avoid it and consult a doctor. When hives persist for more than a few days, a doctor may prescribe an antihistamine medication, as well as lotion to reduce itching and relive inflammation. If you get hives repeatedly, the doctor may suggest that you keep a food diary; once you identify the suspect foods, eliminate them from your regular diet, then reintroduce them one at a time to pinpoint the problem.

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