When the nose smells strange, only a small part of it is cancer (such as nasopharyngeal cancer, etc.), but most of it may be caused by nasal infections, such as sinusitis, atrophic rhinitis and other diseases. When your nose smells strange odor in your life, you should go to the hospital in time for examination through nasal endoscopy. 1. Sinusitis: sinusitis can cause a bad odor, especially fungal sinusitis, nasal discharge and thick, accompanied by some fishy odor. 2. Atrophic rhinitis: Atrophic rhinitis is a special type of rhinitis, the main symptoms are decreased sense of smell, nasal dryness, and even odor. When checking, you can see the thin mucous membrane of the nasal cavity, the nasal cavity is wide and smooth, as well as a large number of dry scabs, and so on. Smell strange odor in the nose, not necessarily cancer, may be caused by other reasons, it is recommended to go to the hospital, through the nasal endoscopy or imaging examination to clarify the cause.