The hazards of high blood sugar include making patients feel bad, affecting metabolism, and inducing vascular diseases, etc. It is recommended to consult a doctor in time to clarify the causes of elevated blood sugar, and carry out treatment according to the causes. 1. Make the patient’s spirit poor: high blood sugar is mainly due to the body’s insulin secretion is insufficient, blood sugar utilization disorder and other reasons. So that the glucose in the body can not be utilized by the organization, which can make the organism appear fatigue, weakness, and mental weakness and so on. 2. Impact on metabolism: high blood sugar will cause obvious sugar metabolism disorder, glucose can not be utilized by the cells to produce energy, need to consume a large amount of protein and fat in the body, affecting the metabolism of protein and fat, which in turn causes a variety of complications. 3. Induced diseases: When the body is in the state of high blood sugar for a long time, it will lead to a number of systemic disorders in the human body, resulting in weight loss, growth retardation and other symptoms. It can also cause serious damage to various organs, which can lead to retinopathy, vascular disease, neuropathy and other diseases. High blood sugar has many harmful effects, and if you have high blood sugar, you need to actively cooperate with your doctor for a clear diagnosis and treatment. At the same time, you need to strictly control your diet and exercise in moderation.