Blood sugar 2.7mmol / L is not normal, both for normal people and diabetic patients, are hypoglycemic state, if not timely treatment, the patient is prone to impaired consciousness, and even lead to hypoglycemic coma, hypoglycemic encephalopathy, it is recommended that timely medical attention. The normal range of normal people’s blood sugar fasting is 3.9 ~ 6.1 mmol / L, two hours after meals, the normal range of blood glucose is & lt; 7.8 mmol / L. For non-diabetic patients, the diagnostic standard of hypoglycemia for blood glucose & lt; 2.8 mmol / L, and receive medication diabetic patients as long as the blood glucose & lt; 3.9 mmol / L belong to the hypoglycemia. If the patient is conscious, you can feed some sugar water, chocolate, etc., and then retest the blood glucose. If the patient is already unconscious and unable to eat, he should be sent to the hospital for intravenous glucose supplementation, which can effectively correct the degree of hypoglycemia. Abnormal blood glucose, need to consult a doctor in a timely manner, under the guidance of the doctor systematic treatment.