Is it possible to cough up yellow phlegm after contracting influenza B?
Feb 18, 2025
Source: Cainiu Health
Dr. Ren Yi
Introduction
In general cases, influenza B virus infection leads to coughing with yellow phlegm. In the early stage of the illness, the body's immune system can help eliminate the virus. However, during the middle and later stages of the disease, the immune capacity gradually declines, allowing the virus to further invade the respiratory tract, causing congestion and edema of the respiratory mucosa, along with excessive mucus secretion, resulting in yellow phlegm.
Type B flu refers to influenza B. Generally, after infection with influenza B, patients will cough up yellow phlegm. The specific analysis is as follows:
After infection with influenza B virus, the virus affects the body's immune function, causing a continuous decline in immunity and resistance. In the early stages of the illness, the body's disease resistance can help eliminate the virus. However, during the middle and later stages of the illness, disease resistance gradually decreases, allowing the virus to further invade the respiratory tract, causing congestion, edema of the respiratory mucosa, and excessive mucus secretion, resulting in yellow phlegm. Meanwhile, coughing is also a natural response by the body to clear phlegm and foreign substances from the respiratory tract.
In addition, patients may also experience gastrointestinal symptoms such as nausea, vomiting, and decreased appetite. When influenza B affects the brain, patients may experience symptoms such as headache, convulsions, seizures, and even coma.
It is recommended that patients seek timely medical attention upon the onset of flu symptoms and follow the doctor's instructions for treatment to avoid worsening of the condition. Additionally, during recovery, adequate rest, increased water intake, avoiding exposure to cold air and irritants, can help promote the recovery of the respiratory tract.
