Type 1 diabetes has a genetic predisposition and may be hereditary, and some studies have shown that the co-morbidity rate of type 1 diabetes among identical twins reaches 30% to 40%. type 1 diabetes is overwhelmingly an autoimmune disease, with both genetic and environmental factors involved in its pathogenesis. Certain external factors (e.g. viral infection, chemical toxins and diet, etc.) act on genetically susceptible individuals, activating a series of autoimmune reactions mediated by T lymphocytes, causing selective pancreatic β-cell destruction and failure, and the body’s insulin secretion insufficiency progressively aggravates, which ultimately leads to type 1 diabetes mellitus. Patients with type 1 diabetes should be diagnosed and treated under the guidance of specialized doctors.