Uveoparotitis is characterized by parotitis, uveitis and low grade fever. These are also collectively known as chronic punctate parotitis or chronic autoimmune parotitis. The most common cause of parotitis is mumps. The most common viral cause of parotitis is mumps. Widespread vaccination against mumps has markedly reduced the incidence of mumps parotitis. Serum and urinary amylase rise during the first week of parotitis. This is a common, non-infectious cause of parotitis. In cases of parotitis, ultrasound-guided biopsy is used to exclude the possibility of lymphoma. During an outbreak, a diagnosis can be made by determining recent exposure and parotitis. Pain resulting from parotitis is caused by an impingement on the great auricular nerve. Submasseteric abscesses are relatively rare, and may be confused with a parotid abscess or parotitis. Such diverticuli typically cause pooling of saliva and recurrent sialadenitis, especially parotitis. Inflammation of one or both parotid glands is known as parotitis. Parotitis presents as swelling at the angle of the jaw.