Diabetes (also known as diabetes mellitus) is a condition in which the body either can't make or can't use insulin properly. Insulin is a hormone normally produced by the pancreas. Insulin is very important because it regulates the sugar level in the blood, and it allows the body to use this sugar for energy. Without enough insulin, the body's cells can't get the energy they need, the sugar level in the blood gets too high, and many problems can result.
There are many complications that come from diabetes and poor blood sugar control. People with diabetes can develop nerve problems, kidney disorders, blindness, and severe infections. They also have a higher risk of coronary heart disease, stroke and certain cancers, like pancreatic and uterine cancer.