Swallowing sweet saliva also means that the mouth has a sweet taste, may feel sweet when drinking plain water, there may be the following situations: 1, seen in patients with diabetes, may not have regular glucose-lowering treatment, especially after eating sweet food, resulting in a rise in blood glucose throughout the body, blood glucose content is elevated, can lead to saliva secretion of salivary glands containing sugar is also elevated, this time the patient will feel the mouth is sweeter; 2, It may be a problem of the digestive system, abnormal secretion of digestive enzymes, such as excessive amylase content in digestive enzymes, when swallowing, there will be a sweet taste sensation. There should be a problem with sweet saliva in the throat, or it is recommended to go to ENT, endocrinology, gastroenterology for further examination and give appropriate treatment.