Swelling and pain on the left side of the face next to the ear, most commonly seen in acute mumps, temporomandibular arthritis, parotid tumors and other diseases, according to the specific disease, medication, surgery and so on. 1. Acute mumps: mostly caused by mumps virus infection, oral antiviral drugs, such as: ribavirin, etc., local auxiliary helium-neon laser irradiation has a certain effect on pain and swelling. 2. Temporomandibular arthritis: temporomandibular joint dysfunction can cause temporomandibular arthritis, which is mainly manifested as limitation of mouth opening, accompanied by obvious pain and swelling and pain of ear and face. Non-steroidal anti-inflammatory drugs, such as meloxicam and acetaminophen, can be used to reduce local pain and cool down the temperature. 3. Parotid tumor: benign tumors of the parotid gland should go to the hospital as soon as possible for surgical removal of the tumor. According to the nature and scope of parotid lesions, partial or total parotidectomy should be performed. It is recommended that the patient should consult the doctor in time to find out the cause of the swelling and pain on the left side of the face and ear, and follow the doctor’s instructions to standardize the use of medication and treatment.