High Blood Sugar (Hyperglycemia): The Warning Signs You Can't Ignore

23 Aug 2025

High Blood Sugar (Hyperglycemia): The Warning Signs You Can't Ignore High blood sugar, also known as hyperglycemia, is a condition where there's too m...

High Blood Sugar (Hyperglycemia): The Warning Signs You Can't Ignore

High blood sugar, also known as hyperglycemia, is a condition where there's too much glucose in your blood. It’s most often associated with diabetes, but it can affect anyone. Understanding the warning signs of high blood sugar and knowing how to manage it is critical for preventing serious health complications. Ignoring the symptoms can lead to severe consequences like diabetic ketoacidosis (DKA) or hyperglycemic hyperosmolar state (HHS), both medical emergencies. Let’s dive deep into what you need to know about hyperglycemia.

What is High Blood Sugar (Hyperglycemia)?

Hyperglycemia occurs when your body doesn't have enough insulin or when it can't use insulin properly to convert glucose from food into energy. This can happen for several reasons, including:

  • Diabetes: Both type 1 and type 2 diabetes are primary causes.
  • Diet: Eating a diet high in carbohydrates and sugars can lead to a spike in blood sugar.
  • Inactivity: Lack of physical activity can make it harder for your body to use insulin effectively.
  • Stress: Stress hormones can raise blood sugar levels.
  • Illness: Infections and other illnesses can affect blood sugar control.
  • Medications: Certain medications can increase blood sugar levels as a side effect.

Common Warning Signs of High Blood Sugar

Recognizing the symptoms of hyperglycemia early is essential for prompt management and preventing complications. Here are some of the most common warning signs:

Related reading: A1C Calculator Convert Your Hemoglobin A1C To An Average Blood Sugar

  • Frequent Urination: Also known as polyuria, your kidneys try to eliminate excess glucose through urine, leading to more frequent trips to the bathroom, especially at night.
  • Increased Thirst: Polyuria leads to dehydration, causing you to feel excessively thirsty (polydipsia).
  • Blurred Vision: High blood sugar can cause the lens of your eye to swell, leading to temporary blurred vision.
  • Fatigue: High blood sugar prevents glucose from entering cells for energy, resulting in unexplained fatigue and weakness.
  • Slow-Healing Cuts and Sores: High blood sugar impairs the body's natural healing process, making cuts and sores take longer to heal.
  • Dry, Itchy Skin: Dehydration caused by polyuria can lead to dry, itchy skin.
  • Unexplained Weight Loss: Especially in type 1 diabetes, the body may start breaking down muscle and fat for energy, leading to unexplained weight loss.
  • Increased Hunger: Despite eating, your cells might not be getting enough glucose, leading to increased hunger (polyphagia).
  • Recurrent Infections: High blood sugar can weaken the immune system, making you more susceptible to infections, such as yeast infections and skin infections.

Understanding Blood Sugar Levels

Understanding what constitutes normal vs. high blood sugar levels is crucial for effective management. Blood sugar levels are typically measured in milligrams per deciliter (mg/dL).

Category Fasting Blood Sugar (mg/dL) 2-Hour Postprandial (After Meal) Blood Sugar (mg/dL)
Normal Less than 100 Less than 140
Prediabetes 100 to 125 140 to 199
Diabetes 126 or higher 200 or higher

Fasting blood sugar is measured after an overnight fast (at least 8 hours), while 2-hour postprandial blood sugar is measured two hours after starting a meal. Regular monitoring, especially for individuals with risk factors, is essential for maintaining healthy blood sugar levels.

Related reading: Master Your Metabolism A Beginner S Guide To Controlling Blood Sugar

Managing and Preventing High Blood Sugar

Related reading: What A Normal Blood Sugar Level Looks Like For Non Diabetics

Managing high blood sugar involves lifestyle changes, medication (if prescribed), and regular monitoring. Here are some steps you can take:

  • Dietary Changes:
    • Choose Low-Glycemic Foods: Focus on foods that release glucose slowly, such as whole grains, non-starchy vegetables, and lean proteins.
    • Control Portion Sizes: Avoid overeating, which can lead to blood sugar spikes.
    • Limit Sugary Drinks: Reduce or eliminate consumption of sugary drinks like soda, juice, and sweetened beverages.
  • Regular Exercise: Physical activity helps your body use insulin more effectively and lowers blood sugar levels. Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Medication: If you have diabetes, take your prescribed medication (insulin or oral medications) as directed by your healthcare provider.
  • Blood Sugar Monitoring: Regularly check your blood sugar levels to understand how different foods, activities, and medications affect your glucose levels. Keep a log of your readings and share it with your doctor.
  • Stress Management: Practice stress-reducing techniques such as yoga, meditation, or deep breathing exercises.
  • Stay Hydrated: Drink plenty of water to help your kidneys flush out excess glucose.
  • Regular Check-ups: See your doctor regularly for check-ups and screenings, especially if you have risk factors for diabetes.

When to Seek Medical Attention

While lifestyle adjustments can often manage mild hyperglycemia, it's important to know when to seek immediate medical attention. Signs that you need urgent medical care include:

  • High Ketone Levels: If you have diabetes and your blood sugar is high, check your ketone levels using a home ketone test kit. High ketones can indicate DKA, a life-threatening condition.
  • Nausea and Vomiting: Persistent nausea and vomiting can be a sign of DKA or HHS.
  • Abdominal Pain: Especially when accompanied by other symptoms, abdominal pain can be a sign of a serious complication.
  • Confusion or Difficulty Concentrating: High blood sugar can affect brain function, leading to confusion or difficulty concentrating.
  • Rapid Breathing: Rapid, shallow breathing can be a sign of DKA.
  • Fruity-Scented Breath: A fruity odor to your breath can be a sign of DKA.
  • Severe Dehydration: Signs of severe dehydration include dizziness, lightheadedness, and decreased urination.
  • Loss of Consciousness: If you or someone you know loses consciousness, seek immediate medical attention.

Long-Term Complications of Uncontrolled Hyperglycemia

Uncontrolled hyperglycemia over time can lead to serious long-term complications, affecting various parts of the body. These complications include:

  • Cardiovascular Disease: High blood sugar damages blood vessels, increasing the risk of heart disease, stroke, and peripheral artery disease.
  • Nerve Damage (Neuropathy): High blood sugar can damage the nerves, leading to numbness, tingling, and pain, particularly in the hands and feet.
  • Kidney Damage (Nephropathy): High blood sugar can damage the kidneys, leading to kidney failure and the need for dialysis or kidney transplant.
  • Eye Damage (Retinopathy): High blood sugar can damage the blood vessels in the retina, leading to vision loss and blindness.
  • Foot Problems: Nerve damage and poor circulation can increase the risk of foot ulcers, infections, and amputation.
  • Skin Conditions: High blood sugar can increase the risk of skin infections, such as fungal and bacterial infections.
  • Hearing Impairment: Studies have shown a link between high blood sugar and hearing loss.
  • Cognitive Impairment: High blood sugar can affect brain function, increasing the risk of cognitive decline and dementia.

Conclusion

Recognizing the warning signs of high blood sugar and taking proactive steps to manage it is critical for preventing serious health complications. If you experience any of the symptoms mentioned above, consult your healthcare provider for evaluation and management. Lifestyle changes, medication, and regular monitoring can help you keep your blood sugar levels within a healthy range and maintain optimal health. Remember, early detection and proper management are key to preventing long-term complications associated with hyperglycemia.