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.

Source: HealthDay

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