Generally speaking, laryngitis is classified as an inflammatory disease. To determine whether it might be a bacterial or viral infection, we typically recommend a complete blood count and C-reactive protein test. Based on the white blood cell count, the classification of white blood cells, and the level of C-reactive protein, we can make an initial judgment about whether the cause is likely viral or bacterial, and then proceed with the corresponding treatment. Additionally, laryngoscopy can also be performed to examine the condition of the laryngeal tissues and other structures for differential diagnosis.