This condition is often associated with the presence of inflammatory and infectious diseases in the nasal cavity and sinus area, as well as allergic diseases, such as acute and chronic rhinitis, chronic sinusitis, and allergic rhinitis. Some patients may have significant deviation of the nasal septum, or the combined presence of polyps, papillomas and other growths in the nasal tract, which may lead to the occurrence of similar symptoms. The symptoms of nasal congestion may be more obvious during nighttime sleep, especially when sleeping in the lateral position, the nasal congestion on the side facing downward is often more obvious and is related to the aggravation of local congestion caused by postural factors, which requires further detailed examination to distinguish the cause.