Right cheek pain may be caused by mouth ulcers, temporomandibular joint disorder disease or parotid inflammation, specifically need to go to the hospital to check the oral cavity. 1. Mouth ulcers: If there is a large mouth ulcer at the right buccal mucosa, there may be obvious pain, and a yellowish-white pseudomembrane can be seen at the mucosa with reddish color around it when checking the oral cavity. 2. Temporomandibular joint disorder: the temporomandibular joint is located in front of the ear screen, when there is joint disorder disease, there may be pressing pain or pain in opening and closing the mouth in front of the ear screen, limitation of opening, and joint popping and murmur can be heard. 3. parotid inflammation: parotid gland is located in the cheek part of the inner side wall of the mouth, parotitis when checking the oral cavity, can be seen in the parotid duct opening red and swollen, localized fever and pressure pain. The specific cause of right parotid pain needs to be determined after checking the oral cavity in the hospital, and it is recommended to consult a doctor in time for treatment.