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Does coughing all the time mean one's sick?

My boyfriend is always coughing, but says he feels fine and insists he isn't sick. But does his always coughing mean that he definitely IS sick? He doesn't smoke, but he does work in a really dusty stockroom, so I guess it could be related to that.
Although coughing is often a sign of an upper respiratory infection, a cough that is long lasting can point to other possible causes. A chronic cough is defined as lasting longer than 8 weeks. Some common causes are asthma, allergies, postnasal drip, certain medications, and acid reflux. Asthma is a disease of the airways that is normally characterized by difficulty breathing and wheezing. However, some people with asthma have cough as their only symptom (cough-variant asthma) which can be triggered by cold air or pollutants (such as exposure to dust in your boyfriend's case). Sinus problems and allergies can lead to postnasal drip which can cause a chronic cough. Postnasal drip causes irritation at the back of the throat and patients often complain of a constant "tickle" in their throat that causes them to cough or clear their throat. GERD, gastroesophageal reflux disease, is when stomach acid flows backwards into the tube that connects your stomach and throat. This causes constant irritation in the back of the throat which can lead to a chronic cough. These are just a few causes of chronic cough but there are many more, some of which are more serious. Therefore, it is important for your boyfriend to see his primary care doctor to determine the underlying cause of his cough and obtain appropriate treatment.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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