Right ear pain when biting teeth hard may have the following diseases: 1. Temporomandibular joint disorder syndrome, which mainly manifests as swelling, soreness, joint popping and jaw movement disorder of the temporomandibular joint when biting teeth hard, because this joint is located in front of the ear, so the pain may radiate to the ear and appear as ear pain, with no disease in the actual ear. For this case, patients are advised to visit the stomatology department to improve the X-ray or CT examination of this area. clinically, symptomatic treatment such as hot compresses and physiotherapy can be given.2. Some patients have diseases such as otitis externa and otitis media. when biting hard on the teeth, it causes pulling of the muscles around the ear canal and painful sensation, which also occurs when pressing the ear screen and pulling the auricle, and can be seen as congestion, redness and swelling of the ear canal and The ear canal can be seen to be congested, red and swollen, the tympanic membrane is congested and other related manifestations.