There are 4 sets of sinuses ordinarily present in humans, but congenital absence or hypoplasia of one or more sinus cavities is not uncommon. The maxillary and ethmoidal sinuses form during the third ...
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An allergy occurs when the body’s immune system overreacts to irritants and allergens. A sinus infection, sometimes called sinusitis, is usually bacterial or viral. The symptoms of allergies and sinus ...
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