ABSTRACT
@#Chronic obstructive diseases of the parotid gland are common clinically, with repeated swelling and a prolonged course and poor treatment outcomes. Based on the summarization of clinical practice and related literature, from the viewpoint of etiology, parotid obstructive diseases can be classified as mechanical obstructions, specific obstructions and non-specific obstructions. The principles of fluid mechanics are introduced to explain the formation of parotid obstructions. According to the different causes, the methods of changing the flow pattern of saliva in the parotid to reduce the resistance and relieve the obstruction, are proposed, such as mechanical factors removals, application of drugs that promote saliva secretion and lower saliva viscosity, ductal expansion under endoscopy and stent placement, and embolization of collateral ducts. These managements can effectively increase the salivary flow rate, reduce the occurrence of the saliva stranded and parotid gland obstructions.