Blood donation is not recommended for patients with hypoglycemia. Patients will experience panic, sweating, hunger, hand trembling and weakness during hypoglycemic episodes, and donating blood at this time will aggravate the corresponding symptoms. Sugary food intake, including small cookies and snacks, should be given immediately to correct the hypoglycemic state in time. In case of hypoglycemia in diabetic patients, in addition to disorders of glucose metabolism, there may also be disorders of lipid metabolism and problems with blood quality, so blood donation is also not recommended. When hypoglycemia is severe, coma may occur. In this case, it is necessary to go to the hospital immediately to inject glucose intravenously or to inject glucagon and adrenocorticotropic hormone to quickly relieve hypoglycemia. Because hypoglycemic coma of more than 6 hours, if not corrected, the patient may easily develop into a vegetative state, and in severe cases, there is a risk of life-threatening illness. After hypoglycemia is corrected, it is important to identify the cause of its occurrence and give timely treatment. Hypoglycemia is common in diabetic patients and is caused by over-injection of insulin or failure to eat in time after taking oral hypoglycemic drugs. In addition, hypoglycemia may also occur in the general population as a result of exercise and prolonged absence of food.