What are the signs of hyperglycemia?

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.

Related Questions

What are classic signs of hyperglycemia?

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.
See below. Excessive thirst and urination, weight loss and increased appetite are common symptoms. Very high blood sugar can cause coma.

What are the signs of a hyperglycemia attack?

No such thing. Hyperglycemia is not a sudden "attack" but generally a sustained problem. Symptoms include frequent thirst, urination, weight loss, fatigue, blurred vision, etc. You need to take with your doctor if you develop these.