Old spitting may be related to well-developed salivary glands, oral diseases, digestive diseases, etc. It is recommended to go to a specialized hospital for examination to find out the cause and early treatment if necessary. 1. Developed salivary glands: Some people may be born with developed salivary glands, which may produce too much saliva and make them spit all the time. 2. Oral diseases: for example, mouth ulcers, gingivitis, or wearing orthodontic appliances, etc., which stimulate the salivary glands, thus leading to frequent spitting. 3. Digestive diseases: chronic gastritis, esophageal reflux and other digestive diseases, excessive secretion of gastric acid, which can also lead to increased secretion of saliva, it is recommended that the patient go to the stomatology department or internal medicine in time to consult with professionals and active treatment.