Blood glucose 50 mmol/L can cause nausea, vomiting, anorexia, poor appetite, headache, dizziness, blurred vision, loss of vision, and even respiratory depression in some patients, resulting in fast, rapid breathing and exhaling a rotten apple smell. Some, because of blood sugar of 50 mmol/L, can lead to hypokalemia induced arrhythmia, leading to cardiac arrest and coma. And some patients may also go into shock, causing dry skin and cold extremities. If there is a blood sugar greater than 50 mmol/L must immediately go to the hospital to see the endocrinology department, need to use intravenous insulin to lower sugar, oral hypoglycemic drugs and subcutaneous insulin is no longer effective.