Bronchitis is typically caused by a respiratory virus, and much less frequently, by a bacterial infection, the American Lung Association says.
Risk factors include having close contact with someone who has bronchitis, failure to get age-appropriate vaccinations, and exposure to tobacco smoke, fumes, dust and air pollution.
The American Lung Association says symptoms of bronchitis typically include:
- Coughing up mucus that may be yellow or green.
- Runny and stuffy nose starting a few days before chest congestion.
- Feeling tired.
- Sore ribs from prolonged periods of coughing.
- Wheezing or a whistling sound while breathing.
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