The sweet taste in the mouth may be caused by drinking a lot of sugary drinks or eating starchy foods. However, if there is a sweet taste in the mouth without eating sweet food for a long time, it may be related to digestive system diseases and diabetes, which can be judged according to other accompanying symptoms, and it is recommended to seek medical examination to confirm the diagnosis to avoid delaying the treatment time. 1. Digestive system diseases: due to long-term preference for greasy, spicy food or abalone, bird’s nest and other foods containing high nutrition, or mental stress, staying up late, insomnia and other factors, which may cause digestive function Disorders of digestive function, inducing digestive system diseases, such as spleen and stomach heat, indigestion, etc. Digestive disorders can lead to increased secretion of salivary amylase, which breaks down the eaten starch to form glucose, causing the phenomenon of feeling a sweet taste in the mouth. It can be accompanied by abdominal distension, abdominal discomfort, diarrhea and other symptoms, which should be treated in time, and it is recommended to take medication under the guidance of a doctor. 2. Diabetes: When the systemic blood glucose rises above its own limit, blood glucose can be exuded through the basement membrane of salivary glands and enter saliva, and the sugar content of saliva rises, which can lead to a sweet taste in the mouth consciously. It is accompanied by symptoms of polyphagia, polyphagia, polyuria, weight loss, fatigue, dry mouth, etc. At this time, it is necessary to actively treat the primary disease, and the symptoms can be gradually reduced with the improvement of the disease. In addition, it is recommended that the daily diet should be light, with less spicy, oily and other stimulating foods to reduce the stimulation of the stomach and intestines. If there is spleen and stomach disharmony, you can consult a regular Chinese medicine hospital and take Chinese medicine to regulate the spleen and stomach under the guidance of a Chinese medicine practitioner. And diabetic patients should strengthen the control of diet according to their own situation, such as rationing of staple foods, having vegetables at meals, controlling the intake of sugar, together with active treatment with medication, which can help relieve the symptoms of sweet taste in the mouth.