Common causes of yellow water coming out of the nose include rhinitis, nasal vestibulitis, sinusitis, ruptured maxillary sinus cysts, and cerebrospinal fluid rhinorrhea. It is recommended to go to the ear, nose and throat department of the hospital as soon as possible to identify the specific causes. 1. Rhinitis: acute rhinitis early, allergic rhinitis due to nasal mucosal edema, vasodilatation and other reasons can appear in the nose yellow water phenomenon. 2. Nasal vestibulitis: mainly caused by allergic factors, often manifested as a small amount of yellow liquid oozing from the skin of the nasal vestibule, mostly accompanied by the phenomenon of crusting. 3. Sinusitis: the nasal secretion in sinusitis is mucopurulent, and the combination of staphylococcus aureus and other bacterial infections can lead to yellow nasal mucus, and even the phenomenon of yellow water flowing from the nose. 4. Maxillary sinus cyst rupture: if the maxillary sinus cyst rupture, at this time will also flow a lot of yellow liquid, transparent color, mostly unilateral intermittent outflow. 5. Cerebrospinal fluid nasal leakage: common in trauma, surgical injury and spontaneous nasal leakage, at this time, the cerebrospinal fluid can flow from the nasal cavity, so the phenomenon of yellow water flowing from the nose. If you have the phenomenon of yellow water flowing from your nose, please consult a doctor in time and follow the doctor’s instructions for treatment to avoid delaying the condition.