Symptoms of High Blood Sugar: 10 Warning Signs of Hyperglycemia

23 Aug 2025

Symptoms of High Blood Sugar: 10 Warning Signs of Hyperglycemia Understanding the symptoms of high blood sugar, or hyperglycemia, is crucial for manag...

Symptoms of High Blood Sugar: 10 Warning Signs of Hyperglycemia

Understanding the symptoms of high blood sugar, or hyperglycemia, is crucial for managing your health and preventing complications associated with diabetes. High blood sugar occurs when your body has too much glucose in the blood. Recognizing the warning signs early can allow you to take prompt action, whether it's adjusting your diet, medication, or seeking medical advice. This article outlines ten common symptoms that may indicate you have high blood sugar.

What is Hyperglycemia?

Hyperglycemia happens when your blood glucose (blood sugar) levels are higher than the target range. This can occur in people with diabetes if their bodies aren’t producing enough insulin, are resistant to insulin, or both. It can also happen in people without diabetes due to stress, illness, or certain medications. Unmanaged hyperglycemia can lead to serious long-term health problems.

10 Key Symptoms of High Blood Sugar

Here are ten important warning signs of hyperglycemia:

  1. Frequent Urination (Polyuria): One of the earliest and most noticeable symptoms is needing to urinate more often than usual, especially at night. Your kidneys try to flush out the excess glucose through urine.

  2. Related reading: How To Lower Your A1C Blood Sugar Naturally A Step By Step Guide

    Increased Thirst (Polydipsia): Because your body is losing fluids through frequent urination, you'll likely feel extremely thirsty. No matter how much water you drink, you might not feel fully quenched. This persistent thirst is a strong indicator of elevated blood sugar levels.

  3. Unexplained Weight Loss: When your body can't use glucose for energy due to insulin deficiency or resistance, it may start breaking down muscle and fat for fuel. This can lead to unintended weight loss, even if you're eating normally.

  4. Blurred Vision: High blood sugar can cause the lens of your eye to swell, leading to temporary blurred vision. While this symptom is often reversible once blood sugar is managed, persistent hyperglycemia can damage the blood vessels in your eyes over time, potentially leading to vision problems.

  5. Fatigue and Weakness: High blood sugar levels can interfere with your body's ability to use glucose for energy efficiently. As a result, you might feel tired, sluggish, and generally weak. Even simple tasks may seem exhausting. Addressing blood sugar control is essential to restore energy levels.

    Related reading: Understanding Your Diagnosis Prediabetes And Diabetes Blood Sugar Ranges

  6. Slow-Healing Cuts and Sores: Hyperglycemia can impair blood circulation and nerve function, which can hinder your body's ability to heal cuts, sores, and infections. If you notice that minor injuries are taking longer than usual to heal, it could be a sign of high blood sugar.

  7. Dry and Itchy Skin: High blood sugar can draw moisture away from your skin, leading to dryness and itching. Additionally, poor circulation associated with hyperglycemia can make your skin more susceptible to irritation and infections.

  8. Frequent Infections: High blood sugar can weaken your immune system, making you more prone to infections, particularly yeast infections (such as thrush or vaginal yeast infections), skin infections, and urinary tract infections (UTIs).

    Related reading: Your Ultimate Blood Sugar Levels Chart Normal Prediabetes Amp Diabetes Ranges

  9. Numbness or Tingling in Hands and Feet (Neuropathy): Prolonged exposure to high blood sugar levels can damage the nerves, leading to numbness, tingling, or a burning sensation in your hands and feet (peripheral neuropathy). This is a long-term complication of uncontrolled diabetes and hyperglycemia.

  10. Headaches: While not a definitive sign of hyperglycemia, some individuals may experience headaches as a symptom of high blood sugar levels. Dehydration caused by frequent urination can also contribute to headaches.

What To Do If You Suspect Hyperglycemia

If you experience several of these symptoms, especially if you have risk factors for diabetes, it's essential to:

  • Check Your Blood Sugar: If you have a blood glucose meter, check your blood sugar levels immediately. This provides valuable information to share with your doctor.
  • Contact Your Healthcare Provider: Schedule an appointment with your doctor for a thorough evaluation and blood sugar testing. Early diagnosis and management are critical to preventing long-term complications.
  • Follow Your Doctor's Advice: If you have diabetes, follow your doctor's recommendations regarding medication, diet, and exercise to maintain healthy blood sugar levels.
  • Stay Hydrated: Drink plenty of water to help flush out excess glucose and prevent dehydration.
  • Maintain a Healthy Lifestyle: Adopt a balanced diet, engage in regular physical activity, and maintain a healthy weight to support blood sugar control.

Blood Sugar Level Chart (HTML Table Example)

Monitoring your blood sugar levels is essential for effective diabetes management. Here’s a general guide. Consult with your doctor to determine your personal target range.

Blood Sugar Level Reading (mg/dL) Status
Fasting Blood Sugar Less than 100 Normal
Fasting Blood Sugar 100 to 125 Prediabetes
Fasting Blood Sugar 126 or higher Diabetes
2 Hours After Meal Less than 140 Normal
2 Hours After Meal 140 to 199 Prediabetes
2 Hours After Meal 200 or higher Diabetes

Disclaimer: This table provides general guidelines. Consult with your healthcare provider for personalized target ranges.

Conclusion

Recognizing the symptoms of hyperglycemia is a proactive step toward better health. By being aware of these warning signs and taking prompt action, you can effectively manage your blood sugar levels and reduce your risk of long-term complications associated with diabetes. Remember to consult your healthcare provider for personalized advice and treatment.