What Causes Yellow Nasal Discharge?

Hello, the most common condition is acute or chronic sinusitis. Sinusitis is primarily caused by infectious factors—specifically, secondary bacterial infection of sinus secretions—leading to purulent or yellowish purulent nasal discharge. Additionally, there is a mucosal cyst in the larynx. As this mucosal cyst gradually enlarges, it may eventually rupture, discharging a pale-yellow serous fluid. This discharge is typically a one-time event of short duration, representing the cyst’s expulsion of its contents. We hope the above information is helpful to you. Wishing you a pleasant and healthy life!