This document summarizes different types of rhinitis including viral, bacterial, allergic, vasomotor, and chronic non-specific inflammations. Common cold is usually viral in origin while diphtheritic rhinitis involves a membrane covering the nasal cavity. Allergic rhinitis is an immunologic response to allergens. Vasomotor rhinitis is due to overactivity of the parasympathetic nervous system. Chronic non-specific rhinitis can lead to hypertrophy or atrophy of the nasal mucosa over time if left untreated.