What could happen if your blood glucose levels get too high?

Diabetes: Chronically high blood glucose is the cause of diabetes.

Coma: Severe hyperglycemia can leave to coma and in it's worst case scenario even death.

Many consequences: You can get dehydrated with very high blood sugar. This can lead to fatigue, dizziness, confusion... At high enough number, you can get very confused, go into coma and if not treated correctly and timely, death can occur. The first thing to do if your bs start climbing is to start drinking water, then seek help (call physician...).