If water is running in the nose, there are several conditions to consider. First, the most common is nasal running water caused by rhinitis, such as allergic rhinitis and vasomotor rhinitis, when suffering from rhinitis, especially after exposure to allergens, causing increased parasympathetic nerve activity, glandular hyperplasia and secretion, causing increased nasal discharge. You can use anti-allergy sprays, such as endosulfan, Acetapine or Renolcort, etc., to spray the nasal cavity 1-2 sprays at a time, twice a day, to reduce the secretion of nasal mucosal glands, and you can take oral treatment with drugs such as kairetan and cisplatin. Second, the rupture of sinus cysts in the nasal cavity caused by nasal flow. Sinus cysts are like balloons filled with water, when the cysts are relatively small most of them do not have any symptoms, and can not be dealt with, regular review can be. However, when the cyst grows to a certain level, there may be a sudden flow of yellow water from the nasal cavity on the side of the long cyst, with more yellow water flowing on the first day, and then gradually decreasing until there is none. This symptom may occur repeatedly and can only be treated by surgery, but it is easy to recur. Finally, if nasal flow is caused after trauma or surgery, further sinus CT or biochemical examination of cerebrospinal fluid is needed to see if there is cerebrospinal fluid leakage, and if it is indeed cerebrospinal fluid nasal leakage, it can be treated conservatively for three months, and if there is no relief or if symptoms such as fever and headache occur frequently, surgery should be considered.