People with diabetes get hypoglycemia (low blood sugar) when their bodies don't have enough sugar to use as fuel. It can happen for several reasons, including diet, some medications and conditions, and exercise. Most people feel symptoms of hypoglycemia when their blood sugar is 70 milligrams per deciliter (mg/dL) or lower. Each person with diabetes may have different symptoms of hypoglycemia. Early symptoms include confusion, dizziness, feeling shaky, hunger, headaches, irritability, pounding heart, racing pulse, pale skin, sweating, trembling, weakness and anxiety. Without treatment, you might get more severe symptoms, including poor coordination, poor concentration, numbness in mouth and tongue, passing out, nightmares or bad dreams or even coma.