What Are the Symptoms of High Blood Sugar? 10 Warning Signs to Watch For

23 Aug 2025

What Are the Symptoms of High Blood Sugar? 10 Warning Signs to Watch For High blood sugar, also known as hyperglycemia, can be a silent threat if left...

What Are the Symptoms of High Blood Sugar? 10 Warning Signs to Watch For

High blood sugar, also known as hyperglycemia, can be a silent threat if left unmanaged. It often serves as an indicator of diabetes, or can occur in individuals already diagnosed who are struggling to control their blood glucose levels. Understanding the symptoms of high blood sugar is vital for timely intervention and preventing long-term health complications. This article outlines ten key warning signs you should be aware of.

Related reading: The Anti Crash Diet Best Foods To Control Blood Sugar All Day

Why is Recognizing High Blood Sugar Symptoms Important?

Uncontrolled high blood sugar can damage your blood vessels, nerves, and organs. Recognizing the symptoms allows you to take action, which may involve lifestyle changes, medication adjustments, or immediate medical attention. Over time, chronic hyperglycemia can lead to serious complications, including:

  • Heart disease
  • Kidney damage (nephropathy)
  • Nerve damage (neuropathy)
  • Eye damage (retinopathy)

10 Warning Signs of High Blood Sugar

Here are ten warning signs that could indicate you have high blood sugar:

  1. Frequent Urination (Polyuria): One of the classic symptoms of hyperglycemia is needing to urinate much more often than usual, especially at night. Your kidneys try to flush out the excess glucose through urine, leading to increased trips to the bathroom.

  2. Excessive Thirst (Polydipsia): Because of increased urination, your body becomes dehydrated, leading to extreme thirst. You may find yourself constantly reaching for water or other beverages.

  3. Unexplained Weight Loss: Even without changes to your diet or exercise routine, high blood sugar can cause you to lose weight. This is because your body might not be able to use glucose for energy efficiently, instead breaking down muscle and fat.

  4. Increased Hunger (Polyphagia): Despite eating normally, you may feel constantly hungry. This occurs because your cells aren't receiving enough glucose, triggering the hunger response.

  5. Related reading: Feeling Shaky And Anxious Understanding The Signs Of Low Blood Sugar Hypoglycemia

    Blurred Vision: High blood sugar can cause fluid to be pulled from the lenses of your eyes, leading to blurry vision. This effect can be temporary but recurring if blood sugar levels remain elevated.

    Related reading: Feeling Dizzy And Weak The Hidden Signs Of Low Blood Sugar Hypoglycemia

  6. Slow-Healing Cuts and Sores: Elevated blood sugar can impair your body's ability to heal. Minor cuts, scrapes, or sores may take significantly longer to heal than normal.

  7. Frequent Infections: High glucose levels can weaken your immune system, making you more susceptible to bacterial and fungal infections. Common infections include urinary tract infections (UTIs), yeast infections, and skin infections.

  8. Fatigue: Feeling unusually tired or weak can be a sign of hyperglycemia. When glucose isn't properly used for energy, it results in persistent fatigue, even after sufficient rest.

  9. Dry, Itchy Skin: High blood sugar can lead to dry, itchy skin due to dehydration and poor circulation.

  10. Numbness or Tingling in Hands and Feet (Neuropathy): Prolonged exposure to high glucose levels can damage nerves, especially in the hands and feet. This nerve damage, known as neuropathy, can cause numbness, tingling, burning, or pain.

Factors that Contribute to High Blood Sugar

Several factors can contribute to hyperglycemia, including:

  • Diabetes: This is the most common cause. Both Type 1 and Type 2 diabetes can lead to elevated blood sugar.
  • Diet: Consuming high-carbohydrate or sugary foods can cause a rapid spike in blood glucose.
  • Lack of Physical Activity: Exercise helps your body use glucose for energy. A sedentary lifestyle can increase blood sugar levels.
  • Stress: Physical or emotional stress can trigger the release of hormones that raise blood sugar.
  • Illness: Infections or other illnesses can make it harder to control blood sugar.
  • Medications: Certain medications, such as steroids, can increase blood glucose levels.

Diagnosing High Blood Sugar

If you experience several of the symptoms mentioned above, it is important to see a healthcare professional for diagnosis. Common tests include:

  • Fasting Plasma Glucose (FPG) Test: Measures your blood sugar after an overnight fast.
  • Oral Glucose Tolerance Test (OGTT): Measures your blood sugar levels two hours after drinking a sugary drink.
  • A1C Test: Provides an average of your blood sugar levels over the past 2-3 months.

Managing High Blood Sugar

Managing high blood sugar usually involves a combination of lifestyle changes and medical interventions. These might include:

  • Dietary Changes: Following a balanced diet that's low in carbohydrates and sugar is essential. Consulting a registered dietitian can help you create a meal plan that works for you.
  • Regular Exercise: Aim for at least 150 minutes of moderate-intensity exercise per week.
  • Medications: Your doctor may prescribe medications such as insulin or oral medications to help lower your blood sugar.
  • Monitoring: Regular blood glucose monitoring can help you track your levels and adjust your treatment plan as needed.

The Long-Term Impact of Unmanaged High Blood Sugar

Ignoring the symptoms of high blood sugar can have severe consequences, ultimately affecting your overall quality of life.

Complication Description
Heart Disease Increased risk of heart attack, stroke, and other cardiovascular problems due to damaged blood vessels.
Kidney Disease (Nephropathy) Damage to the kidneys' filtering units, leading to kidney failure and the potential need for dialysis.
Nerve Damage (Neuropathy) Nerve damage, often starting in the feet and hands, can cause pain, numbness, and loss of sensation.
Eye Damage (Retinopathy) Damage to the blood vessels in the retina, potentially leading to blindness.
Foot Problems Poor circulation and nerve damage can increase the risk of foot ulcers and infections, potentially leading to amputation.

When to Seek Immediate Medical Attention

Certain symptoms warrant immediate medical attention. If you experience any of the following, seek emergency care:

  • Severe Abdominal Pain
  • Rapid Breathing
  • Confusion or Disorientation
  • Loss of Consciousness
  • Vomiting
  • Signs of Dehydration (e.g., dark urine, dizziness)

These symptoms could indicate a serious condition called diabetic ketoacidosis (DKA), which requires immediate treatment.

Conclusion

Recognizing the symptoms of high blood sugar is a critical step in managing your health and preventing long-term complications. If you experience any of the warning signs discussed in this article, consult with a healthcare professional for proper diagnosis and treatment. Early detection and proactive management can help you maintain optimal health and quality of life. Remember to maintain a balanced diet, engage in regular physical activity, and monitor your blood glucose levels regularly, especially if you have a history of diabetes or other risk factors.