Atrophic rhinitis is a chronic inflammation of the nose that causes progressive atrophy of the nasal mucosa, characterized by scanty secretion and foul-smelling crusts. It has primary and secondary types with various causes, including hereditary factors, infections, and autoimmune reactions, leading to symptoms such as nasal obstruction and anosmia. Treatment options include medical interventions like nasal douching and hormonal therapies, as well as surgical procedures aimed at increasing nasal secretions and reducing the size of the nasal cavity.