What causes bronchitis?

What causes bronchitis?

Usually, acute bronchitis is brought on by a viral infection, though it may also be caused by a bacterial infection. The flu and colds are examples of viral infections.

Chronic bronchitis is usually, but not always, caused by smoking tobacco. It can also be caused by exposure to secondhand cigarette smoke, air pollution, dust, or toxic gases. Your risk can be increased by family history of bronchitis, having asthma and allergies, and having gastroesophageal reflux disease (GERD).