There are many causes of soreness in the cheeks, such as strain on the bite muscles, temporomandibular joint disorders, inflammation of the head and face, and facial allergic diseases. 1. Bite muscle strain: If the patient often eats hard food, such as various nuts and bones, or used to chew for a long time, such as betel nut and chewing gum, the bite muscle may be strained, resulting in spasm and soreness of the cheeks. 2. Temporomandibular joint disorder: generally related to mental factors, occlusal factors, low immunity, overloaded joints, which can be manifested as pain in the muscles around the joint area when opening and chewing, such as soreness and swelling of the cheeks. 3. Inflammation of the head and face: for example, parotitis, mostly caused by infection, immunity, obstruction and other causes of inflammation, can be manifested as parotid gland enlargement, can occur unilaterally, both sides can also occur at the same time, accompanied by pain, pressure pain, chewing and eating irritating food when the pain is more intense, but also can be manifested as a feeling of soreness and swelling of the parotid gland. 4. Facial allergic diseases: generally due to allergic causes, such as seasonal facial skin allergies, may also cause soreness and swelling of the cheeks. And there will be redness, swelling and itching on the skin surface. If the symptoms of soreness and swelling of the cheeks have not been relieved, it is recommended to go to the hospital in time for examination.