Chronic cough is a common problem in patients who visit physicians. The three most common causes of persistence cough in nonsmokers who were not taking an ACE inhibitor and who had a normal or stable chest radiograph are: postnasal drip, asthma and gastroesophageal reflux. After a viral upper respiratory infection, it takes sometimes seven weeks for bronchial airway hyperreactivity to return to normal. By using a standard protocol, 95 percent of patients with chronic cough can be managed successfully but in some cases it may take even five months or more to determine a diagnosis and effective treatment.
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