Allergies come in various forms. Some people are allergic to pollen and some to fine hair. However, the most common allergy that people suffer from is caused by dust. An omnipresent allergen, dust settles in very quickly and can easily enter your airways causing irritation to the throat and eventually cough. Although a cough syrup may help ease the irritation, it cannot prevent your allergy from acting up again. But what causes a dust allergy and why are natural remedies for cough ineffective against it?