Diabetic coma, also known as hyperglycemic hyperosmolar nonketotic syndrome, is a serious complication that can occur in people with type 2 diabetes who become ill or stressed. It occurs when blood sugar levels become too high and the body severely dehydrates. Symptoms include increased thirst, urination, weakness, and altered mental state. Treatment aims to correct the high osmolality over 48-72 hours with intravenous fluids and insulin while avoiding fluid overload. People are monitored closely and given dextrose or insulin as needed depending on their blood glucose levels until stabilized.