What are the main symptoms of hypoglycemia?

Hypoglycemia refers to the blood sugar concentration below 2.77mmol/l(50mg/dl), which is a common complication of diabetic patients treated with oral hypoglycemic drugs or insulin. The early symptoms of hypoglycemia are mainly the excitement of autonomic nervous system, especially sympathetic nervous system, which is characterized by palpitation, fatigue, sweating, hunger, pallor, tremor, nausea and vomiting. Severe hypoglycemia is often manifested as symptoms of sugar deficiency in the central nervous system, such as confusion, mental disorder, limb paralysis, incontinence, lethargy, coma and so on. It is worth noting that each patient's hypoglycemia may be different, but the symptoms of each attack are basically similar to the patients themselves.