There are two main types of diabetes: Type 1  — Type 1 diabetes is characterized by a lack of insulin production, leading to elevated blood sugar levels. This can result in dangerous complications involving the circulatory system, and can often lead to the development of other chronic conditions. People with type 1 diabetes must take insulin every day (typically via an injection) in order to manage the condition. Type 2 — Type 2 diabetes also involves problems with insulin, but instead of not producing enough insulin, the body does not properly respond to it. This is often called insulin resistance and must be carefully monitored in order to avoid negative health risks.