The cause of type 1 diabetes is unknown.However, it is believed to involve a combination of genetic and environmental factors. Risk factors include having a family member with the condition.The underlying mechanism involves an autoimmune destruction of the insulin-producing beta cells in the pancreas.Diabetes is diagnosed by testing the level of sugar or A1C in the blood.Type 1 diabetes can be distinguished from type 2 by testing for the presence of autoantibodies.

There is no known way to prevent type 1 diabetes. Treatment with insulin is required for survival. Insulin therapy is usually given by injection just under the skin but can also be delivered by an insulin pump. A diabetic diet and exercise are an important part of management. Untreated, diabetes can cause many complications. Complications of relatively rapid onset include diabetic ketoacidosis and nonketotic hyperosmolar coma.[Long-term complications include heart disease, stroke, kidney failure, foot ulcers and damage to the eyes. Furthermore, complications may arise from low blood sugar caused by excessive dosing of insulin.

Type 1 diabetes makes up an estimated 5–10% of all diabetes cases.The number of people affected globally is unknown, although it is estimated that about 80,000 children develop the disease each year.[5] Within the United States the number of people affected is estimated at one to three million. Rates of disease vary widely with approximately 1 new case per 100,000 per year in East Asia and Latin America and around 30 new cases per 100,000 per year in Scandinavia and Kuwait. It typically begins in children and young adults.