Diabetes is a condition where the body does not properly process sugar due to insufficient insulin production or response. There are three main types of diabetes: type 1 caused by no insulin production; type 2 caused by insulin resistance; and gestational diabetes in pregnant women. Before developing type 2 diabetes, many people have pre-diabetes with higher than normal blood sugar levels. Symptoms include frequent urination, increased thirst and hunger, and fatigue. Risk factors include obesity, family history, and certain medical conditions. Diabetes is managed through lifestyle changes like diet and exercise as well as medication but cannot be cured. It poses serious health risks and is a major global health problem.