1. A deviated nasal septum is caused by trauma, developmental issues, masses in the nasal cavity, and racial or hereditary factors.
2. Types of deviations include anterior/caudal dislocation, C-shaped, S-shaped, spurs, and thickening. Clinical features include nasal blockage, recurrent colds, headaches, and epistaxis.
3. Surgical techniques to correct deviations include septoplasty, which involves scoring and removing portions of cartilage, and submucosal resection, which removes larger sections of cartilage. Complications can include hematomas, abscesses, perforations, and synechiae.