Understanding Chronic Cough and Its Causes
When you have a lingering infection in your sinuses, mucus can drip down the back of your nasal passages rather than coming out your nose. When this occurs, it's called postnasal drip, and it can cause a chronic cough because of the continuing irritation to the throat. Sometimes postnasal drip and cough linger for weeks after you've otherwise recovered from a cold.
Asthma patients suffer from inflamed airways that tend to swell, creating shortness of breath, wheezing and, often, coughing. If your cough is worse at night or in the early morning
Smokers and those with other lung problems are more susceptible to chronic cough. If you have a cough that does not go away a week or two after any other infectious symptoms have subsided, you should see a doctor to get treatment and to discern the underlying cause, or causes, of the cough.