There are various causes of salivary gland enlargement, such as complications caused by their own diseases, malnutrition, neurological dysfunction, etc., as follows: 1, There is also a group of patients who suffer from alcoholism or clinical changes of liver cirrhosis due to heavy drinking, which can also lead to swollen salivary glands; 3, local bruising and swelling due to trauma can also lead to swollen salivary glands, which can improve after local warm compresses; 4, IgG4-related diseases can lead to swollen salivary glands, which need to be treated with hormones and immunosuppressants.