Allergies occur when your immune system overreacts to a substance that's (usually) harmless. Common allergens include pollen, dust, mold, animal dander, and specific foods. Allergies can affect people of all
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Childhood allergies are very common. Like adults, children can be allergic to foods like nuts or shellfish, products like laundry detergent or soaps, pet dander, or to environmental allergens like
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