There are many reasons for pain behind the cheeks, such as mumps, swollen and painful gums, temporomandibular arthritis, and enlarged local lymph nodes. 1. Mumps: Mumps is mainly caused by infection with mumps virus, which can cause parotid gland enlargement, pain, and even skin flushing, high fever, and elevated skin temperature. 2. Gum swelling and pain: pain at the back of the cheeks may belong to gum swelling and pain, due to the swelling and pain caused by the infection of the gums, and the phenomenon of pain at the back of the cheeks will also occur. 3. Temporomandibular arthritis: Temporomandibular arthritis can also cause pain behind the cheeks, mainly due to the temporomandibular joint structural damage, joint dysfunction caused by the pain of the muscles around the joint. 4. Local lymph node swelling: acute pharyngitis, acute tonsillitis and other respiratory infections, can lead to local lymph node swelling, so the phenomenon of pain behind the cheeks. There are other causes of pain in the back of the cheeks, it is recommended to go to the hospital in time to improve the examination of the symptoms, under the guidance of the doctor to take standardized treatment, do not ignore the symptoms, take it lightly, so as not to lead to adverse consequences.