Prediabetes is the precursor stage before diabetes mellitus in which not all of the symptoms required to diagnose diabetes are present, but blood sugar is abnormally high. This stage is often referred to as the “grey area.” It is not a disease; the American Diabetes Association says, “Prediabetes should not be viewed as a clinical entity in its own right but rather as an increased risk for diabetes and cardiovascular disease (CVD). Prediabetes is associated with obesity (especially abdominal or visceral obesity), dyslipidemia with high triglycerides and/or low HDL cholesterol, and hypertension.” It is thus a metabolic diathesis or syndrome, and it usually involves no symptoms and only high blood sugar as the sole sign.


Prediabetes typically has no distinct signs or symptoms except the sole sign of high blood sugar. Patients should monitor for signs and symptoms of type 2 diabetes mellitus. These include the following:

  • Constant hunger
  • Unexplained weight loss
  • Weight gain
  • Flu-like symptoms, including weakness and fatigue
  • Blurred vision
  • Slow healing of cuts or bruises
  • Tingling or loss of feeling in hands or feet
  • Recurring gum or skin infections
  • Recurring vaginal or bladder infections
  • A high BMI (Body Mass Index) result