What causes Chronic bronchitis?
Chronic bronchitis is a long-term condition. People have a cough that produces excessive mucus. To be diagnosed with chronic bronchitis, you must have a cough with mucus most days of the month for at least 3 months. Chronic bronchitis is one type of chronic obstructive pulmonary disease, or COPD for short. (Emphysema is another type of COPD.) The following things can make bronchitis worse:
Air pollution Allergies Certain occupations (such as coal mining, textile manufacturing, or grain handling) Infections </s>