There are many causes of rhinitis in clinical settings, such as acute rhinitis, which is primarily due to infections, especially viral infections. Chronic rhinitis has many influencing factors, such as incomplete treatment of acute rhinitis leading to chronic conditions, or originating directly from chronic rhinitis. For instance, physical and chemical irritants, inappropriate use of medications in the nasal cavity, such as rhinitis medicamentosa caused by the use of nasal mucosa constrictors, and some inappropriate self-actions like habitual nose-picking, can all cause chronic rhinitis. Other forms of rhinitis, such as allergic rhinitis, are mainly caused by allergic factors. There is also vasomotor rhinitis, mainly due to inconsistent vasoconstriction, among other reasons. These are the main factors. (For specific medications, please follow the guidance of a professional physician and do not medicate blindly.)