What causes low blood glucose (sugar)?

Low blood glucose, or low blood sugar, is called hypoglycemia. It is when your blood glucose is below 70 mg/dL.

Low blood glucose (hypoglycemia) may happen when:

• you do not eat enough food

• you take too much insulin or other diabetes medicines

• you are more active than usual.

This may happen very quickly and could cause you to pass out if you do not treat right away.