The sweetness of saliva may be caused by physiological factors, gastrointestinal diseases, or psychological factors. 1. Physiological factors: for example, usually love to eat sweets, or the diet of sugar content is high, will cause the feeling of sweet saliva, the phenomenon of sweet saliva. 2. Gastrointestinal diseases: abnormal secretion of digestive juices in the gastrointestinal tract and imbalance of the bacterial flora may also cause reflux of digestive juices, which may lead to the symptom of hypersalivation and sweetness of mouth. 3. Psychological factors: For example, if you have psychosomatic diseases, you may feel the phenomenon of hypersalivation and sweet mouth. There may be other reasons for the sweetness of the mouth, so you need to go to the hospital in time and follow the doctor’s instructions for treatment.