High blood sugar, or hyperglycemia, is a major concern for both type 1 and type 2 diabetes. It usually happens in two ways.
This happens without eating or drinking for at least 8 hours. And your blood sugar is higher than 130 mg/dL (milligrams per deciliter).
Postprandial or after-meal hyperglycemia.
If your blood sugar bumps up to 180 mg/dL 2 hours after meal, you are probably get this kind of hyperglycemia.