What causes yellow nasal discharge?

There are several causes of yellow nasal discharge, mainly including: 1. **Wind-heat感冒 (Wind-Heat Common Cold):** Usually caused by internal heat, this is a common reason for yellow nasal discharge during a cold. In such cases, it is recommended to drink more water, avoid ginger soup, and consider consuming heat-clearing beverages such as mung bean soup. 2. **Rhinitis:** Patients with rhinitis may experience yellow nasal discharge due to bacterial or viral infections. Particularly after a virus invades the nasal cavity and respiratory tract, the characteristics of nasal discharge may change. 3. **Sinusitis:** Inflammation of the nasal sinuses may also cause yellow, pus-like nasal discharge, often accompanied by symptoms such as reduced sense of smell. 4. **Nasal Polyps:** Benign nasal cavity tumors such as nasal polyps can also lead to yellow nasal discharge, possibly accompanied by symptoms like nasal congestion and headache. In addition, respiratory tract inflammation (such as pneumonia and bronchitis) and nasal cysts may also cause yellow nasal discharge. If symptoms persist without improvement, timely medical consultation is recommended.