What Is Causing My Cough? A cough can develop for any number of reasons. Allergens and other irritants in the air are the most common cause of a cough, but infections and viruses also often lead to a cough. Fortunately, no matter the cause, there are steps you can take to find relief: Finding Relief From a Cough Avoid perfume and other scented products in the home. Drink plenty of fluids to stay hydrated. Get ...