Hypoglycemia and diabetes are two completely different diseases. The difference between them lies not only in the difference of blood sugar level, but also in the different ways of handling them. Hypoglycemia is defined as blood sugar below 2.8 mmol/L, and the patient will show signs of panic and hunger. The treatment of hypoglycemia is to replenish glucose to bring blood sugar back to normal level, either by eating, or by oral glucose, or by intravenous glucose to correct blood sugar. Common diseases that can cause hypoglycemia are islet cell tumor, neoplastic disease or when a diabetic patient overdoses on medication. And diabetes is defined as blood sugar higher than normal, such as fasting blood sugar greater than 7.0mmol/L, or two hours after meal blood sugar greater than or equal to 11.1mmol/L, random blood sugar greater than or equal to 11.1mmol/L. Diabetes is to reduce blood sugar level, need to control blood sugar by controlling diet and medication to prevent complications.