Nasal congestion when lying on the side of the ventilation, the principle is due to the role of gravity, lying on the side of the bottom of the nasal turbinate and nasal mucosa blood flow slow stagnation leads to mucosal congestion, and towards the upper nasal cavity nasal mucosa nasal turbinate congestion to reduce the bottom of the nasal cavity is relatively narrow and cause nasal congestion, towards the top of the nasal cavity is relatively spacious ventilation better. If the alternating nasal congestion often occurs, and lasts for a long time, and at the same time combined with the symptoms of increased nasal secretion, need to consider chronic rhinitis. It is recommended to go to the hospital for nasal endoscopy to make a clear diagnosis and then treat the symptoms. If the nasal congestion occurs only occasionally and is not combined with other symptoms, no special treatment is needed. If unilateral nasal congestion for a long time, you need to consider the nasal septum deviation or nasal mass and other conditions. It is recommended to go to the hospital to complete the examination, and then determine how to treat according to the examination results.