The harm of diabetes lies in its complications, most patients with type 2 diabetes mellitus disability and death due to chronic complications, the development of complications and long-term poor glycemic control has a close relationship with good glycemic control is to prevent the development of complications of basic measures, early detection of complications and give effective treatment is to alleviate the harm of the complications of the method, when diabetic patients with the following manifestations is to be highly vigilant about the possibility of complications Possibility: 1, blurred vision The increased incidence of cataracts in diabetic patients can lead to blurred vision, while diabetic retinopathy of the fundus of the eye will lead to acute vision loss. 2, increased urine foam Diabetic nephropathy early due to increased protein content in the urine may appear increased urine foam phenomenon, so increased urine foam to consider the possibility of diabetic nephropathy. 3.Headache, dizziness, nausea may be the precursor of high or low blood pressure or hypoglycemia. 4, abnormal sweating The so-called abnormal sweating is specifically manifested as too little sweating, excessive sweating or almost no sweating; or sweating area is abnormal, to consider the autonomic function is damaged. 5, easy to fatigue, limb weakness, poor mental state This situation may be related to the body’s glucose operation is hindered, as well as the accumulation of metabolites. 6.Cold hands and feet, and the skin of the hands and feet is pale or purple This is a hint of ischemia in the body, and gangrene of the feet may occur in serious cases. 7, chest tightness, pre-cardiac area discomfort The appearance of this symptom may be related to cardiovascular disease. 8.Numbness, tingling and sock-like sensory loss of both feet are manifestations of peripheral neuropathy. 9.Frequent nausea and vomiting If nausea and vomiting occur frequently, it suggests that ketoacidosis may occur. 10, feet skin pale, cold or even dark purple is the manifestation of limb ischemia, to prevent the occurrence of diabetic foot; 11, hypogonadism, impotence The emergence of this situation may be a sign of microvascular lesions or autonomic nerve damage in patients with diabetes. 12, bloating, constipation may be gastrointestinal plant nerve damage or excessive use of biguanide; for sugar lovers, should be prevented before it is too late, the blood glucose control in the ideal range at the same time to understand the aura and performance of diabetes-related complications, early detection and treatment of related complications, in order to improve the quality of life, in order to live a long and healthy life.