High blood levels of glucose can cause several problems, including:
Blurry vision
Excessive thirst
Fatigue
Frequent urination
Hunger
Weight loss
However, because type 2 diabetes develops slowly, some people with high blood sugar experience no symptoms at all.
Symptoms of type 1 diabetes:
Fatigue
Increased thirst
Increased urination
Nausea
Vomiting
Weight loss in spite of increased appetite
Patients with type 1 diabetes usually develop symptoms over a short period of time. The condition is often diagnosed in an emergency setting.
Symptoms of type 2 diabetes:
Blurred vision
Fatigue
Increased appetite
Increased thirst
Increased urination