Type 1 diabetes mellitus is caused by insulin resistance.

Type 1 diabetes mellitus is caused by a single genetic mutation in an autosomal dominant gene

Type 1 diabetes mellitus is a complication of other diseases affecting the pancreas (e.g., pancreatitis), hormone disturbances (e.g., Cushing’s disease), or due to medications (e.g., corticosteroids)

Type 1 diabetes mellitus is an autoimmune disease that leads to the destruction of insulin-producing pancreatic beta cells