There is a foul odor when you rub your nose, which is mostly seen in fungal sinusitis and odontogenic maxillary sinusitis. 1. Fungal sinusitis: chronic rhinitis, allergic rhinitis, deviated septum, etc., can cause swelling of the nasal mucosa, resulting in poor ventilation and drainage of the sinuses. Therefore, pathogenic bacteria are easy to survive in the sinuses for a long time, triggering fungal infections, fungal sinusitis causative organisms include Trichoderma, Aspergillus and so on. Fungal clusters of a caseous nature may appear in the nasal cavity and are usually accompanied by nasal odor. 2. Odontogenic maxillary sinusitis: Odontogenic infection, dental surgery, etc. can cause odontogenic maxillary sinusitis, often unilateral onset, can also be accompanied by nasal odor, secretion of abnormal secretions. Smell the nose odor, there are other possibilities, it is recommended that patients seek medical attention in a timely manner, and actively cooperate with the doctor to treat the disease.