Abstract
The nasal cycle is a physiological phenomenon that may cause a periodic change in the patency of the nasal cavities through changes in congestion and constriction of the nasal mucosa especially in the inferior nasal turbinates. This phenomenon was first described by the German physician Richard Kayser in 1895. The nasal cycle is regulated by the hypothalamus via the sympathetic nervous system. Air flow through the nasal cavities is influenced by different factors such as hyperventilation, changes in body position, air temperature, nasal diseases, infection, allergy and vasomotor rhinitis, as well as medications like acetylsalicylic acid and sympathomimetics.
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