Diabetes mellitus is a disorder of carbohydrate metabolism marked by impaired ability to produce or respond to insulin and maintain blood glucose levels. Diabetes mellitus, commonly known as diabetes , is a group of common endocrine diseases characterized by sustained high blood sugar levels. [10][11] Diabetes is due to either the pancreas not producing enough of the hormone insulin or the cells of the body becoming unresponsive to insulin's effects. [12] Classic symptoms include the three Ps: polydipsia (excessive thirst), polyuria (excessive urination), polyphagia (excessive hunger), weight loss, and blurred vision. If left untreated, the ... Diabetes is a chronic condition that affects how your body regulates blood sugar, also known as glucose. Glucose is an essential energy source for your cells, but managing it requires insulin—a hormone produced by the pancreas. In diabetes , this process is disrupted, leading to elevated blood sugar levels, which can cause serious health complications if left untreated. Diabetes occurs when your blood glucose is too high, which can lead to health problems. The main types of diabetes are type 1, type 2, and gestational.