Nephritis generally does not appear dry mouth and bitterness, but a specific type of nephritis or nephritis in a specific situation can appear dry mouth and bitterness. The following specific analysis: a. Diabetic nephropathy, diabetic nephropathy patients can appear dry mouth, bitter mouth, because diabetes itself is a metabolic disease, its pathogenesis is characterized by dry mouth, bitter mouth, polydipsia, polyuria and other as the main clinical manifestations, so patients with diabetic nephropathy can appear dry mouth, bitter mouth. Second, dry syndrome, nephritis caused by dry syndrome can appear dry mouth, bitter mouth, because its main clinical manifestation is the reduction of saliva secretion, so nephritis caused by dry syndrome can appear the clinical manifestation of dry mouth, bitter mouth.