Symptoms of high blood glucose will include thirst, excessive drinking, excessive urination, polyphagia, easy hunger and weight loss. If not actively treated, persistent elevation of blood glucose may lead to various acute and chronic complications. Acute complications include diabetic ketoacidosis, and more chronic complications such as diabetic nephropathy, retinopathy, cardiovascular lesions, neuropathy, and so on. Acute complications: such as diabetic ketoacidosis typical symptoms of nausea, vomiting, exhaling rotten apple flavor; hyperosmolar hyperglycemia syndrome symptoms for a sharp rise in blood glucose, accompanied by severe water loss, and even coma. Chronic complications: diabetic nephropathy may appear double lower extremity edema, foamy urine and other symptoms; retinopathy may appear vision loss and other symptoms; diabetic cardiovascular disease will appear arrhythmia, atherosclerosis and other diseases; may also appear diabetic foot, manifested as foot ulcers, infections and other symptoms. Symptoms of high blood glucose are complex and varied, if you feel unwell, please go to the hospital.