Allergies are problems of the immune system. Most allergic reactions happen when the immune system reacts to a "false alarm." Normally, the human body defends itself against harmful things such as viruses or bacteria. But sometimes the defenses violently attack mostly mild things, such as dust, mold, or pollen.
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An allergic reaction can happen anywhere in the body. This includes the skin, eyes, lining of the stomach, nose, sinuses, throat, and lungs. These are the places where immune system cells are found to fight off germs that are breathed in, swallowed, or come in contact with the skin. Allergic reactions can cause:
Symptoms include a runny and itchy nose, sneezing, postnasal drip and nasal congestion (blockage). A child with allergies may also have itchy, watery, red eyes and chronic ear problems. Even though it's commonly known as "hay fever," allergic rhinitis isn't triggered by hay and doesn't cause fever.
Eggs, milk, and peanuts are the most common causes of food allergies in children, with wheat, soy, and tree nuts also included. Peanuts, tree nuts, fish, and shellfish commonly cause the most severe reactions.
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