Moderate Hypoglycemia often makes you feel mood changes, such as irritability, restlessness, anxiety, or angry. Confusion, difficulty in thinking, or inability to concentrate may occur. You may have blurred vision, feel unsteady, have poor coordination, and have difficulty walking (such as staggering) and talking (slurred speech). Weakness, lack of energy, fatigue, lethargy, or drowsiness may occur. Symptoms of moderate hypoglycemia will affect the nervous system as the blood sugar continues to fall below 50 mg/dL.
Severe Hypoglycemia symptoms occur when blood sugar falls below 30 mg/dL and can lead to loss of consciousness or coma, seizures or convulsions, and low body temperature (hypothermia). Coma may be fatal. Prolonged severe hypoglycemia can cause irreversible brain damage and heart problems, especially if you already have coronary artery disease