This document discusses diabetes mellitus. It defines diabetes as a metabolic disorder characterized by chronic hyperglycemia resulting from defects in insulin secretion or action. There are two main types of diabetes: type 1 diabetes results from not enough insulin production, while type 2 diabetes involves blood glucose levels rising higher than normal. Symptoms include increased thirst, frequent urination, blurred vision and fatigue. Risk factors include heart disease, nerve damage, and kidney disease. Treatment involves insulin injections, blood sugar monitoring, and lifestyle changes like healthy eating.