A low blood glucose of 2.73mmol/L is usually serious and may trigger the risk of life-threatening serious cerebral and cardiac insufficiency, so it is recommended to seek medical attention in time to clarify the cause of the lowering of blood glucose. Generally speaking, fasting blood glucose of 3.9 to 6.1mmol/L is the normal blood glucose value. For non-diabetic patients, hypoglycemia is diagnosed by a blood glucose of <2.8 mmol/L, while medicated diabetic patients with a blood glucose of <3.9 mmol/L are considered to be hypoglycemic. Mild hypoglycemia is generally manifested as dizziness, weakness of limbs, headache, tremor, anxiety, palpitations, hunger and other symptoms. Moderate to severe hypoglycemia usually manifests as twitching of limbs, sweating, limitation of activities, and even leads to impaired consciousness. If the hypoglycemia is prolonged, it may cause irreversible damage to the patient’s brain. In conclusion, in the event of hypoglycemia, it is recommended to take oral carbohydrates or sugar water immediately, seek medical attention promptly, and eat small meals to maintain stable blood sugar.