The occurrence of drooling in bed is usually caused by improper sleeping posture, but it may also be related to some disease factors. If the drool is smelly, it may be related to poor oral cleaning, but also should pay attention to whether it is related to oral diseases, nasopharyngeal diseases, gastrointestinal diseases, etc. 1. Oral diseases: If the patient suffers from oral diseases such as dental caries, pulpitis, gingivitis, periodontitis, etc., it can lead to more secretion of drool in bed, and it is easier to breed bacteria and develop putrefaction, leading to the symptoms of smelly drool in bed; 2. Nasopharyngeal diseases: If the patient suffers from rhinitis, adenomatous hypertrophy, pharyngitis and other nasopharyngeal diseases, can lead to nasopharyngeal odor, and usually accompanied by nasal congestion, runny nose and other symptoms, resulting in sleep can not breathe through the nose, resulting in the symptoms of sleep drool very bad; 3, gastrointestinal diseases: If the patient suffers from gastritis, gastric ulcer, enteritis and other gastrointestinal diseases, can have a certain impact on the peristalsis of the gastrointestinal tract The impact on the peristalsis of the gastrointestinal tract, resulting in indigestion, can also lead to the patient to sleep drooling very smelly symptoms; 4, other: patients appear to sleep drooling very smelly symptoms may also be caused by facial neuritis, stroke, cerebral palsy, Alzheimer’s disease, arteriosclerosis and other factors, commonly in the elderly groups, need to seek medical attention in a timely manner, the relevant examination, according to the specific cause of targeted treatment, so as not to cause other serious It is important to seek prompt medical attention, conduct relevant tests, and provide targeted treatment according to the specific cause to avoid other serious complications.