The most common causes of parotid enlargement are four: 1, parotid inflammation: acute attacks of mumps and chronic mumps, usually mumps is common in children and chronic mumps is common in adults; 2, parotid tumors: benign and malignant tumors can cause parotid enlargement; 3, trauma: trauma to the parotid area can also cause parotid enlargement; 4, obstructive: obstructive parotid enlargement, if the parotid gland has duct stones or parotid saliva is too viscous, the glands secrete more and the ducts can’t get out, in this case, parotid swelling, swelling and pain are more obvious.