Hypoglycemia and hyperthyroidism are 2 completely different diseases. The differences between hypoglycemia and hyperthyroidism are mainly as follows: 1. Different definitions. Hypoglycemia refers to low glucose concentration in the blood. Hyperthyroidism is a clinical syndrome caused by excessive concentration of thyroid hormones in the blood for various reasons. 2. Different symptoms. Hypoglycemia patients mainly show symptoms of sympathetic excitement such as panic, sweating, hand trembling, hunger, memory loss, mental and nervous abnormalities. Continuous severe hypoglycemia will lead to hypoglycemic coma, resulting in irreversible brain damage and even vegetative state. The main symptoms of hyperthyroidism are fear of heat, excessive sweating, lethargy, easy hunger, increased number of stools and other hypermetabolic symptoms. 3, laboratory tests, hypoglycemia in diabetic patients refers to blood sugar below 3.9 mmol/L, while in non-diabetic patients hypoglycemia refers to blood sugar below 2.8 mmol/L. Hyperthyroidism is mainly manifested by elevated T3 and T4 in the blood and decreased TSH. 4. The causes of hypoglycemia are different. Hypoglycemia is mostly seen in diabetic patients receiving oral hypoglycemic drugs or insulin therapy, caused by unreasonable drug doses or irregular diet, and can also occur in patients with insulinoma. Hyperthyroidism is caused by pituitary, or thyroid gland lesions itself.