1. Bronchitis : Causes and symptoms Acute bronchitis usually begins with the symptoms of a cold, such as a runny nose, sneezing, and dry cough. However, the cough soon becomes deep and painful. Coughing brings up a greenish yellow phlegm or sputum. These symptoms may be accompanied ..... Healthline.com (OMS Preferred Provider)
2. Chronic Bronchitis | Causes, Symptoms, Treatment | PDRHealth Chronic bronchitis is a long-term, often irreversible respiratory illness. Those with chronic bronchitis have a daily mucus-producing cough that persists for at least 3 months a year, at least 2 years in a row. pdrhealth.com
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