Sneezing with odor often indicates nasal or oral diseases, such as chronic rhinitis, which causes nasal blockage, and nasal secretions cannot be discharged and combined with bacterial infection will produce odor. In addition, sinusitis is also due to poor drainage in the sinuses, and then combined with bacterial infection resulting in purulent inflammation will also cause odor. Oral diseases mainly include dental caries, gingivitis, dry oral mucosa, oral ulcers, etc., which can cause bad odor in the mouth, and with sneezing these tiny droplets sprayed out may have bad odor. Gastroenterology diseases are mainly gastroesophageal reflux disease, because the gastric contents in the stomach reflux into the mouth, which will lead to a sour odor, and there may also be odor when sneezing, all of which need to be checked by a specialist to clarify the cause.