Excessive secretion of saliva may be related to physiological causes such as food stimulation or pathological causes such as oral mucosal disease, periodontal disease and Alzheimer’s disease. 1. Physiological reasons: when people eat food can stimulate the medulla oblongata sensory center, triggering the salivary secretion center excitation, so that the body secreted a lot of saliva. 2. Pathological causes: such as oral ulcers and other oral mucosal diseases, can stimulate salivary gland secretion, causing excessive secretion of saliva; such as gingivitis and other periodontal diseases, inflammatory factors to stimulate the salivary glands, resulting in excessive secretion of saliva; Alzheimer’s disease patients with the salivary center of the salivary glands secretion control is weakened, which can lead to a large amount of saliva secretion. Excessive salivary secretion may also be caused by other reasons, it is recommended that people with excessive salivary secretion consult a doctor in a timely manner to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor.