The easiest way to prevent hyperglycemia is to control your diabetes. Тhere are many aspects of your diabetes care you can control:

Taking your insulin (or glucose-lowering medication) as prescribed
Take your medication as directed. If you have frequent episodes of hyperglycemia, your doctor may adjust the dosage or timing of your medication.

Avoiding consuming too many calories (i.e., sugary beverages)
Carbohydrate-containing foods directly affect your blood glucose level after eating, so reviewing the amount of carbohydrate in your meals and snacks may be helpful in determining the cause of hyperglycemia.
Controlling stress
During periods of stress, the body releases so-called stress hormones, which cause a rise in blood glucose level. Stress hormones may be released during physical, mental, and emotional stresses. In the short term, this gives the body the extra energy it needs to cope with the stress. But if a person doesn’t have adequate insulin circulating in his bloodstream to enable his cells to use the extra energy, the result will be hyperglycemia.
Staying active (exercising)
Exercise usually lowers blood glucose levels because it improves your cells’ sensitivity to insulin and helps cells burn glucose for energy.

Going to your regularly scheduled doctor’s appointments
If you have trouble keeping your blood sugar within the desired range, schedule an appointment to see your doctor. He or she can help you make changes to better manage your diabetes.
Hyperglycemia is a common complication of diabetes, but through medication, exercise, and careful meal planning, you can keep your blood glucose level from going too high—and that can help you in the long-run.
Keeping your blood glucose levels in the recommended ranges throughout the day will help you avoid long-term complications of diabetes, such as:
- Eye damage
- Heart attack—or other cardiovascular complications
- Kidney damage
- Nerve damage
- Stroke
- Problems with healing wounds
By maintaining your blood glucose levels and prevent hyperglycemia, you can reduce your risk of all these complications.