A wide range of disorders — some of them life-threatening — can be responsible. Here's what you should know.

By Tom Ewing

In case you haven’t noticed, there are a lot of differences between you and your cat. Take coughing, for example.

There are many environmental irritants that can cause sporadic or chronic coughing, including pollen, weeds, grass and mold.

There are all sorts of reasons why you might voluntarily or nervously cause your thoracic cavity — the muscle-bound region between your neck and upper abdomen — to contract and force air from your lungs at a speed exceeding several hundred miles per hour. You might do it purposely to announce your late arrival at a cocktail party (ahem! ahem!). You might do it nervously just before entering the boss’s office for a meeting. Or you might force a cough to clear your throat as you mount the rostrum to…

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