Refers to a special type of diabetes mellitus, the symptoms of which are easy to hunger, polyphagia and other metabolic disorders, and its special manifestations of different types of performance, such as mitochondrial gene mutation diabetes mellitus can be manifested as the onset of the early onset of the disease often accompanied by neurogenic deafness and so on. In addition, with the development of diabetes mellitus, symptoms caused by various acute and chronic complications may appear in the late stage. 1. Symptoms of metabolic disorders: easy hunger, overeating, excessive drinking, excessive urination and weight loss. Some of them may also have itchy skin (especially vulva) and blurred vision. 2. Special manifestations: special types of diabetes have different clinical characteristics. For example, mitochondrial gene mutation diabetes mellitus can be characterized by early onset, thinness, and often accompanied by neurodeafness. 3. Complications: chronic complications such as diabetic nephropathy may appear double lower extremity edema, foamy urine and other symptoms; retinopathy may appear vision loss and other symptoms; acute complications such as diabetic ketoacidosis, typical symptoms of nausea, vomiting, expiration of rotten apple flavor; hyperosmolar hyperglycemia syndrome symptoms for the rapid increase in blood glucose, accompanied by severe water loss, and even coma. Symptoms of specific types of diabetes are more complex and varied, if you feel unwell, please go to the hospital.