Nasal discharge dripping downward like water is mostly seen in allergic rhinitis and cerebrospinal fluid rhinorrhea, as follows: 1. Allergic rhinitis: in addition to clear water nasal discharge, it is accompanied by nasal itching, sneezing and nasal congestion, etc. It belongs to nasal allergy to external allergens. The examination shows that the nasal mucosa is pale and edematous, and there are more watery secretions in the nasal tract, and the treatment mainly gives anti-allergic treatment, such as levocetirizine oral, mometasone furoate nasal spray, etc. 2, cerebrospinal fluid rhinorrhea: generally there is a history of trauma or nasal surgery, sometimes accompanied by headache, etc. The diagnosis is confirmed by checking the glucose in the nasal secretions, and conservative treatment can usually be given after the diagnosis, such as bed rest, low-salt diet, antibiotics to prevent infection, etc. After diagnosis, conservative treatment is usually given, such as bed rest, low-salt diet, antibiotics to prevent infection, and if necessary, to lower the intracranial pressure. If treatment is not effective, cerebrospinal fluid repair is usually required.