Drooling during the day may be caused by physiological factors, digestive system, neurological and other diseases, it is recommended to go to a regular hospital in time, consult a professional to avoid delay in treatment. 1. Physiological factors: physiological conditions are mostly seen in children, children in the stage of tooth eruption may be persistent drooling, slowly grow up to reduce, generally do not deal with, pay attention to observation, maintain hygiene. 2. Digestive system diseases: such as tonsil inflammation, excessive secretion of gastric acid, may lead to bacterial growth in the oral cavity, stimulate the imbalance of the regulation of salivary gland secretion, excessive drooling. 3. Neurological diseases: cerebral ischemic disease, Parkinson’s syndrome, Alzheimer’s disease and other neurological disorders may lead to phases of increased salivation, which need to be combined with the relevant medical history, imaging tests, etc. It is recommended to go to the regular hospital in time for further clarification of the diagnosis and treatment.