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These consist of pollen, mold, dust mites, certain foods, latex, animal dander, and others. These allergens sensitize the nasal mucosal membrane through a sensitization process, which usually involves a few types of cell in our body, such as macrophage, mast and lymphocyte cell. In the beginning of the sensitization, irritants penetrate through the mucosal surface in our nasal passage.

The second step of the sensitization procedure is scavenging of the irritant by the macrophage cell. Macrophage cell is the huge scavenger cell in the blood, whose function is eating up antigen, which is from outside of our body. Throughout the scavenging process, macrophage cells likewise pass details about the invasion of foreign antigen to the lymphocyte cell, which includes numerous enzymes. Lymphocytes are promoted by this info and multiplied to transform into plasma cells, which would synthesize IgE antibodies. IgE antibodies move to the mast and basophil cells around the eye, mouth and nose through tissue fluid and blood where they bind to the mast and basophil cells. When an irritant forms a bridge in between 2 IgE particles on the mast or basophil cells surface, histamine, which is a main chemical mediator, will be released. This chemical will stimulate exocrine glands, contract smooth muscles in the bronchi, dilate capillary and enhance their permeability and trigger itch. Second chemical; prostaglandin, which is a secondary mediator, is manufactured in all types of cell and this chemical will cause swelling around the mucosal surface area inside the nostril.

http://www.youtube.com/watch?v=MKC45xXVKKc

It is much better for them who have asthma or nasal allergy and other breathing allergies to breathe moist air in order that their nose and bronchial passages will not dry up.