Diabetes mellitus is classified as a chronic disease characterised by elevated blood glucose levels. It can occur at any age regardless of gender. The condition is the result of problems with the normal secretion or function of insulin (a hormone produced in the pancreas). Too much glucose in the blood can lead to damage to many organs. A key issue with this disease is the inclusion of appropriate treatment and following the advice of the treating physician. What do we know about the causes of diabetes? What are the types? What symptoms accompany it?