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Feline asthma is the most commonly diagnosed respiratory disorder in cats. Veterinary epidemiologists estimate that at least 1 out of every 100 cats suffer from acute or chronic asthma. Asthma is the constriction of the air passages that lead from the windpipe (trachea) to the lungs. It is generally believed to be a result of inhaled allergens including but not limited to tobacco smoke, dust, pollen, household cleaners, perfume, and aerosol sprays. An inflammatory response occurs when a susceptible cat inhales an allergen. Cells, mucus, and muscle spasms cause constriction of the air passages. The severity of the disease can range from mild to life threatening.