Acute Bronchitis often develops during an upper respiratory infection such as the common cold or influenza.
About 90% of cases are caused due to viruses including rhinoviruses, coronaviruses, respiratory syncytial virus, and influenza virus. Such cases can get secondarily infected with bacteria. This can be observed by the fact that previously coughed up white-colored sputum turns yellowish or greenish.
About 10% of cases are directly caused by bacteria including Streptococcus pneumoniae, and Haemophilus influenzae.
Chronic Bronchitis is usually an assault brought on by various environmental pollutants. Among the leading causes of Bronchitis today is cigarette smoking.
The other causes of Bronchitis of chronic type include:
- Sudden changes of temperature