Acute forms of bronchitis typically last for two to three weeks, although the cough may last for a month or more, according to Web MD. Chronic bronchitis, which is a phlegmy cough that occurs yearly for at least three months of the year, often requires ongoing medical treatment.
Bronchitis is an inflammation of the lungs that often develops during a cold or flu. It typically results in a dry cough, followed by a wet cough heavy in mucus, which is produced by irritated membranes in the lungs. Common symptoms of bronchitis are shortness of breath, wheezy breathing, fatigue and tightness in the chest. Bronchitis symptoms accompanied by a fever may be a sign of pneumonia and require immediate medical attention.