Diabetes is a lifelong condition that causes a person's blood sugar level to become too high. There are two main types of diabetes – type 1 diabetes and type 2 diabetes. However, if you have diabetes, your body is unable to break down glucose into energy. This is because there's either not enough insulin to move the glucose, or the insulin produced doesn't work properly. It's very important for diabetes to be diagnosed as early as possible because it will get progressively worse if left untreated.