Hypoglycemia refers to blood sugar <2.8mmol/L in normal people or <3.9mmol/L in diabetic patients. the main symptoms of hypoglycemia include weakness, sweating, hand trembling, panic, very obvious hunger, irritability, fidgeting, etc. Serious cases may lead to coma, fall, etc. The occurrence of hypoglycemia needs to find the cause and carry out targeted treatment. The causes of hypoglycemia are: 1. Diet: some people deliberately reduce sugar intake in order to maintain weight, or they are busy at work and do not eat on time resulting in hypoglycemia; 2. Exercise: when exercise consumes a lot of energy and does not replenish energy in time, hypoglycemia will occur; 3. Diseases: some people suffer from adrenal insufficiency, pituitary insufficiency, liver disease, dumping syndrome, etc., which lead to hypoglycemia. Some patients with diabetes, when the insulin injection is too much or the dose of hypoglycemic drugs is too large, it will also lead to hypoglycemia. Once the symptoms of hypoglycemia appear, take sugar cubes or eat in time. If the symptoms are not relieved for a long time, you need to seek medical advice to identify the cause and treat it actively.