Diabetes is a chronic disease where the body either does not produce enough insulin or cannot effectively use the insulin it produces, resulting in high blood sugar levels. There are four main types of diabetes: type 1, type 2, gestational, and prediabetes. Type 1 diabetes is an autoimmune disease where the body's immune system attacks and destroys the insulin-producing beta cells in the pancreas. Its causes are not fully understood but may include genetic factors and environmental triggers such as certain viruses. Strict management through insulin therapy, diet, exercise and monitoring of blood sugar levels is needed. Without treatment, complications can include kidney disease, nerve damage, eye problems and heart disease.