Fatigue is a classic symptom of diabetes, states WebMD. Other symptoms include increased thirst or hunger, weight loss, sores that fail to heal and blurred vision. Another symptom is increased urination, particularly at night.
The earliest symptom of diabetes is elevated levels of glucose in the blood, notes WebMD. Initially, the signs of diabetes usually go unnoticed, especially in Type 2 diabetics. With Type 1 diabetes, symptoms typically have a faster onset and are more severe than with Type 2 diabetes.
The fatigue felt as a result of diabetes stems from the body's ineffective way of making insulin, notes WebMD. If the body doesn't make a sufficient supply of insulin or if the body's cell do not absorb glucose properly, energy levels plummet.