Sinusitis is an infection or inflammation of the sinuses. A sinus is a hollow space. There are many sinuses in the body, including four pairs inside the skull. They serve to lighten the skull and give resonance to the voice. These sinuses are lined with the same kind of tissue that lines the inside of the nose. The same things that can cause swelling in the nose—such as allergies or infection—can also affect the sinuses. When the tissue inside the sinuses becomes inflamed, mucus discharge is increased. Over time, air trapped inside the swollen sinuses can create painful pressure inside the head. This is a sinus headache.
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There are several possibilities why food allergies develop. Some dogs have a genetic predisposition to developing allergies. The same holds true for atopic allergies. The other contributing factor to food allergies is constant exposure to the same ingredients. For example, if you have continually fed a lamb and rice diet, the prolonged exposure to those ingredients can cause intestinal inflammation and what we call “leaky gut syndrome,” in which the antigen is absorbed through the permeable gut lining. The reaction manifests in the skin, creating the itch. Rotating foods can help prevent allergy development. Common foods to trigger skin allergies including grains (., corn, wheat, rice, barley, oats) and chicken.