The most common causes of rhinitis are the following: 1. The most common is that the patient may get cold during the night, and the cold invades the mucous membrane of the nasal cavity, causing vasodilatation and exudation of secretions, resulting in rhinitis, which often occurs in children and the elderly. 2. The reason for the increase in nasal secretions is also one of the causes of rhinitis. 3. All in all, when a patient has a nighttime rhinitis attack, it is recommended to apply nasal spray hormone to spray the nose at the clinic, and at the same time, you can take oral Chinese medicine preparations for rhinitis for symptomatic treatment.