The common causes of dry mouth and tinnitus are acute pharyngitis secondary to secretory otitis media and diabetes. 1. Acute pharyngitis secondary to secretory otitis media: mostly caused by bacterial or viral infection, which can cause congestion of the mucous membrane in the oropharynx, leading to dry mouth; when the infection invades the middle ear through the Eustachian tube, it can cause secretory otitis media, and most often see low-pitched buzzing-like tinnitus. 2. Diabetes mellitus: it is a metabolic disease, due to the dysfunction of pancreatic islets, it can show polydipsia, polyuria, and always feel dry mouth; long-term diabetics, there is a certain loss of microcirculation, and when there is an obstacle to the circulation in the ear, tinnitus can be seen, presenting a persistent, such as high-pitched cicadas chirping sound. Therefore, the emergence of dry mouth and tinnitus discomfort, it is recommended to timely formal hospital consultation, clear causes, targeted treatment.