Nasal septum deviation is a deformation of wall that separates the two nostrils. Nasal septum deviation is present in 80% of the population. It may involve the bone or the cartilage of the nose, or both. A deviated septum may be due to a birth defect, or appearing during the growth or trauma to the nose (during sports or an accident…). The deviation of the nasal septum does not always cause symptoms. But when it disrupts the flow of air flow in the nose, it can cause nasal congestion (stuffy feeling), snoring, or promote a sinus infection.