For diabetic patients, venous blood glucose below 3.9 mmol/L is called hypoglycemia. Patients can have various symptoms, but some patients can show no corresponding symptoms. Severe and persistent hypoglycemia can cause serious damage to brain tissue and even lead to death. It is important to understand hypoglycemia and learn about the prevention and treatment of hypoglycemia. What are the manifestations of hypoglycemia? 1. general weakness and sweating; difficulty in seeing things, dizziness; panic, rapid heartbeat; 2. numbness of hands and feet; mental confusion, slurred speech; trembling; hunger; forgetfulness; drowsiness; anxiety; pale face, etc. The treatment of hypoglycemia in daily life 1. If hypoglycemia appears, blood sugar should be tested immediately. If there is no condition to test blood sugar, deal with it temporarily as hypoglycemia. 2.If you are clear, take 15g~20g sugar food orally as soon as possible: such as 2~5 glucose tablets, or 4~5 cubes of sugar, or 2 tablespoons of honey, or half cup of fruit juice, or 1 small piece of bread, or several soda crackers, or some other sugar-containing snacks, etc. 3.Take another blood sugar test after 15 minutes to see if your blood sugar returns to normal level. 4. If your blood sugar is still too low, drink some more juice or eat another piece of candy. Then call your doctor, or go to the hospital immediately. 5.If your condition is so serious that you cannot eat snacks or drink drinks, or is still below 4.4 mmol/L after 30 minutes of treatment, please call 120 immediately or go to the nearest hospital for emergency treatment. 6. The patient’s family should understand the symptoms of hypoglycemia and give small food or rescue treatment in time when the patient has symptoms. If the patient is unconscious, send him/her to hospital immediately. 7.Note: Carry the diabetic patient identity card with you, so that it is easy to remind others how to rescue and treat when an accident occurs. Prevention of hypoglycemia: Measure blood sugar frequently; insulin or oral hypoglycemia should be used on time and in the right amount; eat meals regularly and quantitatively; if you cannot eat on time, you should eat a little fruit, juice or cookie at normal meal time; measure blood sugar before and after exercise, and add meals in time if blood sugar is low after exercise; carry sugary snacks with you at any time, especially for patients treated with insulin; do not drink alcohol on an empty stomach!