Occasionally chest pains, fever, and fatigue or malaise may also occur. Mucus is often green
or yellowish green
and also may be orange or pink, depending on the pathogen causing the inflammation.
Chronic bronchitis is caused most often by exposure to airborne pollutants such as cigarette smoke, excessive dust in the air, or chemicals. Bronchitis caused by allergies can also be classified as chronic bronchitis. Chronic bronchitis also can have an asthmatic component.