If a patient suddenly exhibits symptoms such as dizziness, palpitations, cold sweats, pallor, and hunger, we would first consider the possibility of hypoglycemia. At this time, we use a glucose meter to determine the blood sugar level. If hypoglycemia is confirmed, oral glucose water can be administered and fasting imposed, which can relieve the symptoms. If the hypoglycemia is sporadic, it is likely due to prolonged periods without eating and lack of energy. If hypoglycemia occurs frequently, it is necessary to go to the hospital promptly for examination to rule out diseases causing hypoglycemia, such as the most common cause, an insulinoma.