Diabetes is a common disease of the interaction of genetic and environmental factors caused by high blood sugar as the main clinical signs, a common symptom of how polydipsia, polyuria, polyphagia and weight loss and so on. Diabetes can cause damage to the body multiple systems. Caused by absolute or relative insulin secretion and insulin sensitivity in target tissues cells to reduce the causes of protein, fat, water and electrolytes, such as a series of metabolic syndrome disorders, including high blood sugar as the main logo. Type I diabetes occurs in young people, dependent on exogenous insulin supplement to sustain life; Type II diabetes is more common in the elderly, the performance is not sensitive enough for the body to insulin, the insulin resistance. Diabetes different groups: Neonatal diabetes, pediatric diabetes, young people in adult-onset diabetes, gestational diabetes, senile diabetes.