Bronchitis is divided into. Bronchitis (acute bronchitis), acute type (with symptoms no more than 3 weeks) is more than 90 percent of patients caused by virus most often is followed by influenza which has not been treated or behave properly. Scientists think infection causes of bronchial tubes Bronchitis (chronic bronchitis), chronic (more than 3 weeks, symptoms) may be caused by allergies or exposure to irritants such as pollution or dust, smoke, or chemicals that evaporate for chronic bronchitis. This puts the patient at risk of bacterial infections more easily which may cause phlegm turns yellow or green.
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