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Bronchitis

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Introduction
Bronchitis is an infection of the main airways of the lungs (bronchi), causing them to become irritated and inflamed.
Symptoms of bronchitis
The main symptom of bronchitis is a hacking cough. It is likely that your cough will bring up thick yellow-grey mucus (phlegm), although this does not always happen.
Causes of bronchitis
In most cases, bronchitis is caused by the same viruses that cause the common cold or flu (influenza).
Treating bronchitis
Most cases of bronchitis do not require treatment from a GP, and the symptoms can be easily managed at home.