- βRecognizing hyperglycemia symptoms early prevents escalation to dangerous emergencies like DKA
- βAlways confirm with a blood glucose meter before taking corrective action β symptoms alone can mislead
- βIdentifying your personal triggers helps you and your care team fine-tune your treatment plan
What Is Hyperglycemia?
Hyperglycemia β literally "too much sugar in the blood" β occurs when glucose levels rise above your target range. For most adults with diabetes, that threshold sits around 180 mg/dL (10 mmol/L) after meals, though your doctor may set a personalized goal. Left unmanaged, chronically high blood sugar damages nerves, blood vessels, kidneys, and eyes. Recognizing the warning signs and acting quickly is one of the most important skills you can develop as a person living with diabetes.
Common Symptoms of High Blood Sugar
Hyperglycemia often develops gradually, which is why it can be easy to dismiss early signals. Watch for any combination of the following:
- Frequent urination β your kidneys work overtime to flush out excess glucose
- Excessive thirst β fluid loss from urination triggers intense thirst
- Blurred vision β fluid shifts in the lens of the eye distort focus
- Fatigue and weakness β cells starved of usable glucose leave you drained
- Headache β dehydration and glucose fluctuations trigger headaches
- Slow-healing cuts or infections β high glucose impairs immune function
- Fruity-smelling breath β a sign that the body may be burning fat for fuel (ketosis)
Warning Signs of a Serious Emergency
If high blood sugar goes uncorrected, it can escalate into diabetic ketoacidosis (DKA) in type 1 diabetes, or hyperosmolar hyperglycemic state (HHS) in type 2. Both are medical emergencies. Seek immediate care if you experience nausea, vomiting, deep or labored breathing, confusion, or loss of consciousness.
What to Do When Blood Sugar Is High
1. Check Your Glucose Level First
Before taking any action, confirm with a reliable blood glucose meter. Symptoms alone are not a precise guide β a reading tells you exactly how high you are and how urgently you need to respond. Using an accurate, easy-to-read meter is essential. At mdsdiabetes.com, you'll find a curated range of blood glucose meters and test strips designed for everyday accuracy and convenience.
2. Hydrate
Drink water steadily. Staying hydrated helps your kidneys clear excess glucose through urine and combats the dehydration that worsens symptoms.
3. Take Medication as Directed
If your care plan includes insulin correction doses, follow your prescribed sliding scale. Never adjust medication doses without consulting your healthcare provider first.
4. Move Gently β With Caution
Light activity like a short walk can help lower blood sugar in type 2 diabetes. However, if you have type 1 diabetes and ketones are present, exercise can make DKA worse. Test for ketones before exercising when glucose exceeds 250 mg/dL.
5. Identify the Trigger
Consider what caused the spike: a missed dose, a larger-than-usual meal, illness, stress, or inactivity. Understanding the cause helps you prevent a repeat episode.
6. Re-check and Log
Re-test your blood sugar 2 hours after taking corrective action and record the result. Consistent logging reveals patterns your healthcare team can use to adjust your treatment plan.
Preventing Hyperglycemia Long-Term
- Monitor blood glucose regularly, especially after meals and physical activity
- Follow a balanced, low-glycemic eating pattern
- Take medications consistently and store insulin correctly
- Attend regular check-ups and HbA1c tests
- Keep testing supplies well stocked β running out of strips is a common but avoidable problem
When to Call Your Doctor
Contact your healthcare provider if blood sugar stays above 300 mg/dL despite correction, if you detect ketones, or if symptoms worsen rather than improve within a few hours.