A high blood sugar level can cause several symptoms, including:
Blurry vision
Excess thirst
Fatigue
Frequent urination
Hunger
Weight loss
Because type 2 diabetes develops slowly, some people with high blood sugar have no symptoms.
Symptoms of type 1 diabetes develop over a short period. People may be very sick by the time they are diagnosed.
After many years, diabetes can lead to other serious problems. These problems are known as diabetes complications, and include:
Eye problems, including trouble seeing (especially at night), light sensitivity, and blindness
Sores and infections of the leg or foot, which if untreated, can lead to amputation
Damage to nerves in the body, causing pain, tingling, a loss of feeling, problems digesting food, and erectile dysfunction
Kidney problems, which can lead to kidney failure
Weakened immune system, which can lead to more frequent infections
Increased chance of having a heart attack or stroke
References: American Diabetes Association Professional Practice Committee
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