If the nose drips yellow nasal discharge, clinically there are three main reasons: 1. The more common reason is acute and chronic sinusitis combined with bacterial infection, the inflammatory cells inside the blood vessels swallow debris or bacteria in the form of plasma discharge, nasal discharge is yellow, then the formation of the nose flowing yellow water or yellow pus nasal discharge. 2. The rupture of the submucosal cyst of the maxillary sinus, resulting in nasal flowing yellow water, generally the amount is not a lot, in the clinic generally does not require any treatment. The actual amount of the product is usually not a lot, and it will not need any treatment clinically. 3, it may be nasal vestibular inflammation, patients with nasal vestibular inflammation can appear skin exudation, often exuding yellow liquid, and generally the amount is relatively small.