Insulin is a peptide hormone secreted by the beta cells of the pancreas. The function of insulin is to promote the conversion of glucose into glycogen and inhibit gluconeogenesis, it is a hypoglycemic hormone, and it is the only one in the body that lowers blood sugar. The hazards of insulin secretion to the body include: 1. Hypoglycemia, which is also the most important hazard of excessive insulin secretion. Blood sugar is an important factor in regulating insulin secretion. Under normal circumstances, insulin secretion is reduced when blood sugar is lowered, but when patients develop diseases such as insulinoma, there will be excessive secretion of insulin inappropriately. A large amount of insulin secretion will cause patients to have lower blood sugar and symptoms of sympathetic excitement such as panic, sweating, hand trembling, hunger, and pallor. In severe cases, symptoms of sugar deficiency in the cerebral cortex, patients will have psychoneurological abnormalities, and even hypoglycemic coma and death, etc. 2. Large secretion of insulin will lead to hyperinsulinemia, and hyperinsulinemia will easily lead to weight gain, atherosclerosis and other metabolic diseases occurring in patients.