It is not normal to sneeze out a foul odor. Nasal diseases, oral diseases, throat diseases and other parts of the disease may lead to sneezing odor. 1. Nasal diseases: If you suffer from rhinitis, sinusitis, nasal sinus tumors, nasal foreign bodies and other diseases, the smell coming out of your nose when you sneeze will be very smelly. 2. Oral diseases: Oral diseases, especially diseases of the gums, such as oral infections, gingivitis, halitosis, etc., may also lead to a smelly smell when sneezing out. 3. Diseases of the throat: chronic pharyngitis, tonsil stones patients, can lead to sneezing out the saliva and the odor. 4. Other diseases, such as lung infections and digestive tract diseases, can also lead to the odor of saliva or snot and foul smell when sneezing. Once the smell of sneezing is foul, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, and then give targeted treatment.