The main manifestations of hypoglycemia include sympathetic excitation symptoms and cerebral nerve dysfunction symptoms, as follows: 1. Sympathetic excitation: Hypoglycemia attack can induce sympathetic nerves and adrenal medulla, releasing epinephrine, norepinephrine and peptide hormones, etc., and then show symptoms such as sweating, trembling, palpitations, nervousness, anxiety, hunger, pale face and accelerated heart rate. 2. Cerebral nerve dysfunction: Another important manifestation is brain neurological dysfunction. Brain energy metabolism basically relies on glucose supply in blood, so there will be obvious manifestation of neurological dysfunction when hypoglycemia occurs. In mild cases, there may be inattention and dizziness, and in severe cases, there may be confusion in speech and thinking logic and strange behavior, and in more serious cases, there may be coma. If hypoglycemia is not corrected, it can eventually lead to brain death, myocardial infarction and other serious consequences.