Sudden generalized cold sweat and dizziness may be hypoglycemia. Blood glucose should be measured, if it is lower than 3.9mmol/L, it is generally called hypoglycemia, and glucose can be taken orally or pushed intravenously to correct hypoglycemia quickly. Severe hypoglycemia may cause irreversible damage to brain cell function, and may even be life-threatening. Hypoglycemia can be seen for a variety of reasons, for example, irregular diet during the application of hypoglycemic drugs in patients with diabetes may cause hypoglycemia, common drugs include glibenclamide, rigelene and insulin, metformin generally does not cause hypoglycemia. If the patient is usually weak, three meals a day irregular diet, such as not eating breakfast may cause, so patients must be instructed to eat three meals a day regularly. In addition, patients who exercise strenuously may also cause hypoglycemic reactions.