What does it mean when yellow phlegm appears during coughing in type B influenza?

Yellow phlegm associated with influenza B is a common symptom that may be caused by various underlying conditions. Changes in phlegm color can reflect the severity of the illness. Yellow phlegm suggests an increased systemic inflammatory response due to coughing, possibly indicating that the infection has spread deeper into the respiratory tract. Timely medical attention is essential. Depending on the characteristics of the disease, airway clearance techniques or mechanical ventilation may be used to remove phlegm, along with administration of anti-infective medications to eliminate respiratory pathogens. Additionally, nasal irrigation solutions can be used for throat care to relieve throat discomfort, and saline rinses can help suppress bacterial growth in the mouth. It is also recommended to maintain good hygiene practices, engage in regular physical exercise, drink plenty of water, stay in a positive mood to boost immunity, and pay attention to air pollution.