Swelling of the side of the face without toothache may be caused by parotitis, inflammation of local lymph nodes and sebaceous cyst infection of the face, which can be treated with medication or surgery as prescribed by the doctor. 1. Mumps: Mumps patients usually cause parotid gland enlargement, and in the earlobe below the jawbone, so it may be externally manifested as no toothache but half of the face is swollen. However, there are more factors that cause parotitis, and the treatment options are different, so it is recommended that patients go to the hospital in time to clarify the cause of the disease and target treatment. 2. Localized lymph node inflammation: such patients also usually cause swelling and other phenomena near the lymph nodes. Such as common acute pharyngitis, acute tonsillitis. Patients can follow the doctor’s instructions to use iodine tablets, compound borax solution and other drugs for treatment. 3. Facial sebaceous cyst infection: If the facial sebaceous cysts are large, there may be a toothache half of the face swollen phenomenon, the patient can follow the doctor’s instructions to take cephalosporin, penicillin, etc., or cystectomy and other surgical methods of treatment. To summarize, if the patient does not have toothache but half of the face has obvious or persistent swelling phenomenon, should go to the hospital in time, clear cause, for treatment, the use of drugs need to comply with medical advice.