Early signs and symptoms of diabetes include fatigue, excessive thirst, increased urination, weight loss and blurry vision. These symptoms may appear suddenly or gradually over time, according to Mayo Clinic.
Diabetes often begins in a very subtle manner, states Mayo Clinic. The early signs and symptoms of the disease usually go unnoticed by many patients. These signs and symptoms are a direct result of excess glucose in a patient's bloodstream. As glucose builds up in their bloodstream, patients may feel excessively thirsty because their kidneys are working overtime to clear the sugar from their blood. Patients may also experience blurry vision if they have extremely high blood glucose levels.