Bronchitis means swelling in your air passages (bronchi). Bronchi are the air passages that connect your windpipe (trachea) with tiny air sacs (alveoli) in your lungs. The air sacs are where your body absorbs the oxygen you breathe in.
Bronchitis is an inflammation of the bronchi. This inflammation means the walls of your bronchi are swollen and filled with extra sticky mucus. Airflow into and out of your lungs is partly blocked because of the swelling and extra mucus in your bronchi. This makes you cough.
There are two kinds of bronchitis:
- Acute bronchitis makes you sick for a while, but gets better after two to three weeks.
- Chronic bronchitis doesn't go away. With chronic bronchitis, you have a cough with mucus most days for three months of the year.