Dust mite allergy is an immune system reaction to a certain dust mite protein. This reaction triggers inflammation in the lining of the nasal passages (allergic rhinitis), causing sneezing, runny nose and other signs and symptoms associated with hay fever.

For some people, dust mite allergy may be the primary cause of inflammation and contraction of airways of the lungs (asthma), resulting in wheezing, shortness of breath and other breathing difficulties.Dust mites, relatives of the spider, are too small to see without a microscope.

Dust mites eat skin cells shed by people, and they thrive in warm, humid environments. In most homes, bedding, upholstered furniture and carpeting provide an ideal environment for dust mites. If the relativ humidity in your home is 50%, dust mites die. If the relative humidity rises above 50% they thrive and reproduce, their appetite increases, and therefore their facel matter, the source of the dominant dust mite allergen, increases. 19% of the population that experiences ane allergy-based symtoms reacts to dust mite allergen.

By Mayo Clinic staff