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Nasal septum deviation or deviated nasal septum (DNS)〔http://onlinelibrary.wiley.com/doi/10.1002/lary.21785/abstract Correlation of asymmetric facial growth with deviated nasal septum〕 is a physical disorder of the nose, involving a displacement of the nasal septum. Some displacement is common, affecting 80% of people, most unknowingly.〔 == Signs and symptoms == Only more severe cases of a deviated septum will cause symptoms of difficulty breathing and require treatment.〔WebMD "Deviated Septum" "In fact, estimates indicate that 80% of people, most unknowingly, have some sort of misalignment to their nasal septum. Only the more severe imbalances cause significant breathing problems and require treatment." http://www.webmd.com/allergies/deviated-septum〕Symptoms of a deviated septum include infections of the sinus and sleep apnea, snoring, repetitive sneezing, facial pain, nosebleeds, difficulty with breathing,〔(【引用サイトリンク】title=Deviated Septum Surgery )〕 and mild to severe loss of the ability to smell.〔http://care.american-rhinologic.org/disorders_of_smell_taste〕 The nasal septum is the bone and cartilage in the nose that separates the nasal cavity into the two nostrils. The cartilage is called the quadrangular cartilage and the bones comprising the septum include the maxillary crest, vomer and the perpendicular plate of the ethmoid. Normally, the septum lies centrally, and thus the nasal passages are symmetrical.〔 〕 A deviated septum is an abnormal condition in which the top of the cartilaginous ridge leans to the left or the right, causing obstruction of the affected nasal passage. The condition can result in poor drainage of the sinuses. People can also complain of difficulty breathing, headaches, bloody noses, or of sleeping disorders such as snoring or sleep apnea.〔 It is common for nasal septa to depart from the exact centerline; the septum is only considered deviated if the shift is substantial or is adversely affecting the patient.〔 Many people with a deviation are unaware they have it until some pain is produced. By itself, a deviated septum can go undetected for years and thus be without any need for correction.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nasal septum deviation」の詳細全文を読む スポンサード リンク
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