Yellow and smelly saliva after getting up may be related to oral hygiene, rhinitis, oral diseases and other factors. 1. Oral hygiene: when the patient has bleeding gums, serious dental calculus, loose teeth, etc., may cause oral hygiene conditions are poor, after getting up the saliva is yellow and stinky situation occurs. 2. Rhinitis: If the patient suffers from rhinitis, it will easily lead to inflammation of nasopharyngeal mucosa, resulting in pharyngeal secretions, and even nasal reflux, resulting in infection with anaerobic bacteria, and the phenomenon of yellow and foul-smelling saliva after waking up. 3. Oral disease: If you suffer from gingivitis, periodontitis, salivary gland inflammation and other diseases, may also lead to the emergence of some inflammatory secretions, after mixing saliva, resulting in yellow and smelly saliva after waking up, accompanied by symptoms of pain. When patients wake up with yellow and smelly saliva, they should immediately go to the hospital, clarify the cause of the disease and follow the doctor’s instructions for treatment.