The odor inside the nose is mainly seen in the following diseases: 1. Atrophic rhinitis. This kind of patients have a special odor when they exhale, usually this odor can not smell themselves, mainly due to the nasal cavity of Aspergillus, so that the decomposition of purulent secretions in the nasal cavity into indole. In this case, it is recommended to use saline to do nasal rinsing and other treatments. 2. acute sinusitis. The nasal cavity will also have a bad odor if the nasal cavity has a nasal granuloma or a malignant tumor of nasal lymphoma. 4, mainly in children, there is a foreign body in the nasal cavity, and the foreign body decaying inside the nasal cavity will also have a bad odor. Therefore, for patients with nasal odor, it is recommended that patients do nasal endoscopy and, if necessary, sinus CT examination.