The main causes of diabetes are the following: 1. Genetic factors: Type 2 diabetes is mainly due to family genetic factors, combined with a poor lifestyle, formed under the combined effect of the two; 2. Autoimmune factors: Type 1 diabetes generally has no genetic background, and is mostly related to the patient’s autoimmunity. It is common in children and young people. It can be diagnosed by elevated specific antibodies; 3. Other: Diabetes formed due to some special reasons. Such as diabetes caused by abnormal mitochondrial function, gestational diabetes, etc.