What are classic signs of hyperglycemia?

See below. Excessive thirst and urination, weight loss and increased appetite are common symptoms. Very high blood sugar can cause coma.
Over-urination. The signs of hyperglycemia are the same that you would see with out of control diabetes. This means that you would be drinking a lot of fluid and urinating a lot. You may also be eating more than normal because you are very hungry. If the hyperglycemia becomes very much out of control you may also become tired and even pass out.