Parotid swelling often may have the following causes:1. It may be parotitis, usually caused by infection with a virus, which will appear in the location of the parotid gland suddenly red, swollen, hot and painful.2. It may be the presence of enlarged lymph nodes in the jaw, which is commonly seen in upper respiratory infections, such as acute pharyngitis, acute tonsillitis, or acute bronchitis, that have spread to the lymph nodes in the vicinity. There will also be localized lymph node enlargement and pain. At this time, touch the jaw with granular hard lumps, pain when pressed.3. Inflammation of the gums in the mouth, in addition to localized swelling of the cheeks, it will also lead to pain in the teeth or swelling of the gums.