Dry mouth and bitter mouth may be caused by oral diseases, stomach diseases and other factors, unilateral tinnitus may be caused by otitis media and other factors, the two diseases are not related. When suffering from oral diseases, there will be dry mouth and bitter mouth symptoms, such as gingivitis,, periodontitis, oral ulcers and other oral diseases, will directly destroy the normal environment in the mouth, can not clean the mouth, but also lead to oral odor. When suffering from stomach diseases, a large amount of food stays in the fermentation state, the odor will enter the mouth through the throat cavity, and the symptoms of dry mouth and bitter mouth will appear. Unilateral tinnitus may be caused by otitis media, which is an inflammatory lesion involving all or part of the structure of the middle ear, resulting in unilateral tinnitus and may be accompanied by hearing loss. When patients experience symptoms of dry mouth and bitter mouth and unilateral tinnitus, it is recommended that they go to the hospital in time for examination and diagnosis, and under the guidance of the doctor for treatment.