Whether bronchitis causes elevated white blood cells depends on the cause of the bronchitis, whether it is viral or bacterial bronchitis. If it is bacterial bronchitis, there will be an increase in total white blood cells, neutrophils, calcitoninogen, and C-reactive protein, and clinical cough, coughing yellow sputum, and even fever may occur. In the case of viral bronchitis, the total leukocyte count is not high, or even lower, and the neutrophils are not high with increased lymphocytes. Therefore, if bronchitis causes an increase in leukocytes, if cough, yellow sputum and fever occur, anti-infective treatment should be given as early as possible to avoid complications of bronchopneumonia, especially when pediatric bronchitis attacks, routine blood tests should be given as early as possible to understand whether it is bacterial bronchitis, and anti-infective treatment should be given as early as possible to avoid bronchopneumonia and even induce respiratory failure and heart failure, aggravating The disease. In conclusion, bronchitis combined with bacterial infection can cause an increase in white blood cells.