Hyperglycemia and effects:
Untreated high blood sugar can cause a life-threatening condition called ketoacidosis. When the body doesn't have enough insulin to change glucose into fuel, your body uses fat for energy. Toxic acids called ketones form when your body breaks down fat. Some ketones are flushed from your body in the urine, but others stay in your blood. Symptoms of ketones in the blood include headache, nausea, vomiting, dry mouth, stomach pain, shortness of breath, fatigue, and fruity smelling breath. There are home testing kits to check for ketones in your urine, but you'll need to call your doctor immediately for help to lower your blood sugar level.
Considerations
Even if you are taking medication or being treated for high blood sugar, you can experience hyperglycemia. Sometimes you eat the wrong foods or don't get enough exercise. Infection, illness, and emotional stress can cause blood sugar to rise. Using expired insulin, not taking enough insulin, or forgetting to take your medication can make blood sugar levels go up. Pay attention to symptoms and monitor your blood sugar levels so you can take care of problems as soon as they arise.
Prevention/Solution
If you have symptoms of high blood sugar, check your blood sugar level. If it's high, check your urine for ketones. If there are no ketones, make sure to take your medicine on schedule. Keep track of levels so your doctor can change the dose or time you take your medicine. Don't drink beverages with sugar and eat less. Get a lot of exercise. Physical activity can lower your blood sugar unless you have ketones in your urine. If there are ketones present, exercise can make your blood sugar higher.
Hope this helps.
Ken