Margaret M, a 52-year-old nonsmoker, came to our clinic because of a persistent cough that had started about 4 weeks earlier. She had tried multiple over-the-counter cough suppressants, including dextromethorphan and guaifenesin, as well as cough drops, but none had been effective.Margaret denied having had a cold or respiratory infection in the past few months or being in close contact with anyone with a chronic cough, and she had never had an asthma diagnosis. In response to a question about previous coughing episodes, the patient recalled having had several bouts of chronic cough in the past, including one about a year ago.
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