what causes swelling of parotid gland
Swollen Parotid Salivary Gland Causes. 1  One of the major causes of swollen parotid glands is a virus that causes mumps. 2  Alcoholics are prone to swelling of these salivary glands. 3  Infection of surrounding lymph nodes can spread to the parotid glands. 4  Stones sometimes form in the glands causing inflammation. One of the major causes of swollen parotid glands is a virus that causes mumps. 2  Alcoholics are prone to swelling of these salivary glands. 3  Infection of surrounding lymph nodes can spread to the parotid glands.