Backround: Acute bronchitis is identified by the presence of a cough caused by the inflammation of the trachea and large airways, without signs of pneumonia. Methods: Time series design was used for the study. The study was conducted in a selected hospital. The sample consisted of 126 patients diagnosed with bronchitis who fulfils inclusion criteria. The samples were selected using a purposive sampling technique. Finding: The study revealed that after FEV1 showing an increase from 1.7 ± 0.5 L at Pretest to 2.3 ± 0.5 L at 4 Months, and FVC rising from 2.4 ± 0.6 L to 3.0 ± 0.6 L over the same period. Symptom severity, as measured by the CAT score, decreases from 24 ± 4 at Pretest to 12 ± 4 at 4 Months, indicating an improvement in symptoms. Inflammatory markers, specifically CRP levels, show a reduction from 13 ± 3 mg/L at Pretest to 7 ± 3 mg/L at 4 Months, suggesting a decrease in inflammation. Conclusion: This study concluded that significant improvements in lung function, as evidenced by increases in FEV1 and FVC measurements. Symptom severity decreased, with CAT scores showing a notable reduction. Inflammatory markers, such as CRP levels, also decreased, indicating a reduction in systemic inflammation.