Diabetes may cause systemic complications such as ketoacidosis, diabetic retinopathy, diabetic nephropathy, and diabetic foot. Most people with diabetes show the classic three symptoms of excess drinking, excess urination, excess eating, and weight loss. type 1 diabetes starts in adolescents and is more pronounced. diabetic ketoacidosis occurs when there is a severe lack of insulin, and may be characterized by fatigue, vomiting, dizziness, and, in severe cases, unconsciousness or coma. Type 2 diabetes is a heterogeneous group of diseases that can occur at any age, but is most common in adults. Most patients have insidious onset and relatively mild symptoms, with more than half having no symptoms at all. There are also a few patients with type 2 diabetes mellitus can be complicated by diabetic ketoacidosis, nephropathy, diabetic foot and so on. Diabetic nephropathy can show symptoms such as hypertension, proteinuria or renal insufficiency; diabetic foot will occur in the lower extremity distal nerve abnormality and varying degrees of peripheral vascular disease related to foot ulcers, foot deformities, gangrene and so on. As far as current medicine is concerned, the etiology and pathogenesis of diabetes are not clear, and the treatment of diabetes can be controlled by oral metformin, gliclazide or insulin injection as prescribed by the doctor. If you find that your blood sugar is abnormal, it is recommended that you consult a doctor in a timely manner.