What causes thick nasal discharge in the later stage of influenza B?

Nasal discharge refers to the inflammatory fluid produced in the nasal cavity, often resulting from secretions of the salivary glands, and is associated with various symptoms such as runny nose, nasal congestion, nasal itching, or nasal polyps. In the later stages of influenza B, nasal discharge may also occur, typically clear, white, or light yellow in color, and patients may experience fever, fatigue, and nausea. For thick nasal discharge during the later phase of influenza B, the first step is to conduct an examination to determine whether it is caused by a viral respiratory infection or a respiratory infection secondary to pneumonia. If it is due to a viral infection, antiviral medications may be considered; if the respiratory infection is caused by pneumonia, antibiotic treatment is required. Additionally, patients can drink warm soups, take traditional Chinese medicine that helps alleviate symptoms, and engage in appropriate daily physical exercise to promote recovery.