The cause of nose odor is considered to be related to atrophic rhinitis, sinusitis, nasal foreign body secondary infection and other factors. 1. atrophic rhinitis: this is a slow onset of the nasal mucosa atrophic lesions, usually characterized by nasal congestion, thick secretions, and odorous nasal bacilli colonization, severe and advanced atrophic rhinitis patients, there is usually a special odor phenomenon of exhalation, it is also known as the “odorous nose”. 2. Sinusitis: If the patient has sinusitis, it is likely to be infected by Corynebacterium septicum, resulting in nasal congestion, pus, headache, because the patient will have a large amount of pus, which may gather in the nasal cavity, thus triggering the odor symptoms. 3. Nasal foreign body: the cause of nose odor, also can not be ruled out is due to nasal foreign body secondary infection, there will be obvious tissue decay necrosis, which will produce the symptoms of nose odor. When the patient occurs after the symptoms of nose odor, can go to the hospital otolaryngology consultation, identify the cause, and then take the correct method to lift the nasal odor symptoms.