Hyperglycemia, characterized by elevated blood glucose levels, is a prevalent condition often associated with diabetes mellitus but also influenced by medications, stress, and dietary factors. This article explores the causes of hyperglycemia, including its primary association with Type- 1 and Type-2 diabetes, and highlights the risks of chronic hyperglycemia such as cardiovascular disease, neuropathy, and acute complications like diabetic ketoacidosis (DKA) and hyperglycemic hyperosmolar state (HHS). Effective management strategies are outlined, emphasizing the importance of regular blood glucose monitoring, medication adherence, dietary and lifestyle modifications, and patient education. Understanding and managing hyperglycemia is crucial for preventing long-term complications and improving overall health outcomes.