Sneezing yourself smelling a putrid odor may be caused by maxillary sinusitis, gingivitis, periodontitis, and nasal swelling. 1. Maxillary sinusitis: maxillary sinusitis is mainly caused by bacterial infection and maxillary sinus injury. The patient will have pus, pus odor and other manifestations. If the patient has gingival maxillary sinusitis, there will be putrid odor pus nasal discharge, if the patient nasal discharge into the oral cavity in the sneezing will smell a putrid odor. 2. Gingivitis: gingivitis is considered to be caused by mouth breathing, long-term accumulation of plaque bacteria on the surface of the teeth, tooth misalignment and crowding and other factors. Patients will manifest as bad breath, bleeding gums, tooth pain, so patients will smell a putrid odor when they sneeze. 3. Periodontitis: Periodontitis is caused by dental calculus, traumatic bite, food impaction, plaque and other reasons. Patients will have loose teeth, bad breath, periodontal pockets overflowing pus, red and swollen gums and other symptoms, so patients sneeze themselves smell a putrid odor. 4. Other: patients sneezing themselves smell a putrid odor is also considered to be nasal masses or nasal tumors and other factors. It is recommended that patients sneezing themselves smell a putrid odor need to consult a doctor in a timely manner, the doctor will be for the cause of the treatment.