Learn about the symptoms, causes, treatment of this chronic condition in which the pancreas produces little or no insulin. There are fundamental differences between diabetes type 1 and type 2, including when they might occur, their causes, and how they affect someone's life. Find out here what distinguishes the different forms of the disease, the various symptoms, treatment methods, and how blood tests are interpreted. Diabetes mellitus type 1, also known as type 1 diabetes, is a form of diabetes mellitus in which not enough insulin is produced. This results in high blood sugar levels in the body.