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High Blood Sugar Symptoms: 10 Signs You Shouldn't Ignore
18 Sep 2025 By Sagar Dugani, M.D., Ph.D.

High Blood Sugar Symptoms: 10 Signs You Shouldn't Ignore

High blood sugar, or hyperglycemia, is a condition in which the glucose level in the blood is higher than normal. This can happen for a variety of reasons, most commonly due to diabetes, but also from stress, illness, or certain medications. Ignoring the symptoms of high blood sugar can lead to serious health complications. Therefore, recognizing the early warning signs is crucial for effective management and prevention. This article will cover 10 key symptoms of high blood sugar that should never be ignored.

Why is Managing Blood Sugar Important?

Maintaining healthy blood sugar levels is vital for overall well-being. Chronically high blood sugar can damage blood vessels and organs, increasing the risk of heart disease, kidney problems, nerve damage, and vision loss. It's not just about feeling unwell; it's about preventing long-term, debilitating health issues. Early detection and management can significantly reduce the likelihood of these complications. Recognizing the subtle signs of high blood sugar and taking proactive steps can make a world of difference in preserving your health.


1. Frequent Urination (Polyuria)

One of the earliest and most common symptoms of high blood sugar is frequent urination, also known as polyuria. When there's too much glucose in your blood, your kidneys work overtime to filter it out. This process pulls extra fluid from your tissues, leading to increased urine production.

What to Watch For:

  • Going to the bathroom more often than usual, especially at night. This nighttime urination is called nocturia and can significantly disrupt sleep.
  • Producing larger amounts of urine each time you go. Notice if you're filling the toilet more than normal.
  • Feeling constantly thirsty. Frequent urination leads to dehydration, which in turn causes intense thirst.

Example: If you typically urinate 6-8 times a day and notice you're suddenly going 10-12 times, especially waking up multiple times at night to urinate, it's a red flag.

2. Increased Thirst (Polydipsia)

Closely linked to frequent urination is increased thirst, or polydipsia. As your body loses fluids through excessive urination, you become dehydrated. This triggers the thirst mechanism, making you feel like you can't get enough to drink.

What to Watch For:

  • An unquenchable thirst that water alone doesn't satisfy. You might find yourself drinking large amounts of fluids but still feeling dehydrated.
  • A constant dry mouth. Despite drinking plenty, your mouth feels parched.
  • Craving sugary drinks. Your body might be signaling a need for more glucose, leading to cravings for juice, soda, or other sweet beverages.

Example: You might find yourself downing multiple bottles of water throughout the day but still feeling like your mouth is dry and your throat is parched.

3. Unexplained Weight Loss

Unexplained weight loss can be a concerning sign of high blood sugar. When your body can't use glucose for energy (due to insulin resistance or deficiency), it starts breaking down fat and muscle for fuel. This can lead to unintentional weight loss, even if you're eating normally.

What to Watch For:

  • Losing weight without making any changes to your diet or exercise routine.
  • A noticeable decrease in muscle mass.
  • Feeling weaker and more fatigued than usual.

Example: Losing 10-15 pounds over a couple of months without trying to diet or exercise more could be a symptom of high blood sugar.

Scientific Data: A study published in the Diabetes Care journal found that unexplained weight loss was a significant predictor of undiagnosed type 2 diabetes.

4. Increased Hunger (Polyphagia)

While unexplained weight loss can occur, some individuals with high blood sugar experience increased hunger, or polyphagia. This happens because your cells aren't getting the glucose they need for energy, leading your body to signal that it needs more fuel.

What to Watch For:

  • Feeling constantly hungry, even after eating a full meal.
  • Craving foods high in carbohydrates and sugar.
  • An inability to feel satisfied after eating.

Example: You might eat a large meal but still feel hungry an hour later, or find yourself constantly snacking throughout the day.

5. Blurred Vision

High blood sugar can affect the lenses in your eyes, leading to blurred vision. Excess glucose in the blood can cause fluid to be pulled into the lenses, causing them to swell and change shape. This distorts your vision.

What to Watch For:

  • Sudden changes in your vision.
  • Difficulty focusing on objects, both near and far.
  • Fluctuating vision that changes throughout the day.

Example: You might notice that your vision is clear in the morning but becomes blurry later in the day, or that you have trouble reading small print.

6. Slow-Healing Sores and Cuts

High blood sugar can impair your body's ability to heal, leading to slow-healing sores and cuts. This is because elevated glucose levels can damage blood vessels and nerves, reducing blood flow and hindering the healing process. Additionally, a high-glucose environment can promote bacterial growth, increasing the risk of infection.

What to Watch For:

  • Cuts, bruises, or sores that take longer than usual to heal.
  • Increased risk of infection.
  • Skin infections that are difficult to treat.

Example: A small cut that would normally heal in a few days takes weeks to close, or you develop a minor infection that doesn't respond to over-the-counter treatments. Understanding The Glycemic Index Gi How To Eat For Blood Sugar Balance

Scientific Data: Research published in Wound Repair and Regeneration highlights the detrimental effects of hyperglycemia on wound healing mechanisms, emphasizing the impaired migration and function of immune cells crucial for tissue repair.

7. Fatigue and Weakness

Fatigue and weakness are common symptoms of high blood sugar. When your cells aren't getting enough glucose for energy, you feel tired and drained. Additionally, dehydration from frequent urination can contribute to fatigue.

What to Watch For:

  • Feeling tired and lethargic, even after getting enough sleep.
  • A lack of energy and motivation.
  • Difficulty concentrating.

Example: You might find yourself struggling to get through the day, feeling constantly exhausted, or having trouble focusing on tasks at work or home.

8. Dry, Itchy Skin

High blood sugar can contribute to dry, itchy skin. This is because high glucose levels can draw moisture away from the skin, leading to dryness and irritation. Nerve damage caused by high blood sugar can also reduce sweating, further contributing to dry skin.

What to Watch For:

  • Persistent dry skin, even after using moisturizers.
  • Intense itching, especially on the legs and feet.
  • Flaky or scaly skin.

Example: You might find yourself constantly applying lotion but still experiencing dry, itchy skin, particularly on your lower extremities.

9. Frequent Infections

People with high blood sugar are more prone to frequent infections. Elevated glucose levels can weaken the immune system, making it harder for the body to fight off bacteria and viruses. Glycemic Index Vs Glycemic Load What S More Important For Persons With Diabetes

What to Watch For:

  • Recurring urinary tract infections (UTIs).
  • Yeast infections.
  • Skin infections.
  • Pneumonia or bronchitis.

Example: Experiencing multiple UTIs in a year or frequently developing skin infections could be a sign of underlying high blood sugar. What Are Normal Blood Sugar Levels A Simple Blood Sugar Chart For Adults

Table: Common Infections Associated with High Blood Sugar

| Infection Type | Symptoms | | --------------------- | ------------------------------------------------------------------------------------- | | Urinary Tract (UTIs) | Frequent urination, burning sensation, cloudy urine | | Yeast Infections | Itching, redness, discharge in genital areas | | Skin Infections | Redness, swelling, pus, slow-healing sores | | Respiratory Infections | Cough, fever, chest congestion |

10. Numbness or Tingling in Hands and Feet

Numbness or tingling in the hands and feet, known as neuropathy, is a sign of long-term high blood sugar. Over time, elevated glucose levels can damage nerves, leading to these sensations. This symptom usually develops over a period of time.

What to Watch For:

  • A tingling or prickling sensation in your fingers or toes.
  • Numbness that makes it difficult to feel things.
  • Burning pain in your hands or feet.
  • Sensitivity to touch.

Example: You might experience a pins-and-needles sensation in your feet, or have trouble feeling the temperature of the water when you take a shower.

Important Note: If you experience any of these symptoms, it's crucial to consult a healthcare professional for proper diagnosis and treatment. Early intervention can help prevent or delay serious complications associated with high blood sugar.


What to Do If You Suspect High Blood Sugar:

  1. Consult a Doctor: Schedule an appointment with your healthcare provider for a comprehensive evaluation and blood sugar testing.
  2. Monitor Your Blood Sugar: If you have a blood glucose meter, check your blood sugar regularly, especially before meals and after meals. Keep a log of your readings to share with your doctor.
  3. Follow Your Doctor's Recommendations: Your doctor may recommend lifestyle changes, such as diet and exercise, or prescribe medication to manage your blood sugar.
  4. Make Dietary Changes: Focus on a balanced diet with plenty of fruits, vegetables, and whole grains. Limit sugary drinks and processed foods.
  5. Exercise Regularly: Aim for at least 30 minutes of moderate-intensity exercise most days of the week. Exercise helps improve insulin sensitivity and lowers blood sugar levels.

By recognizing these 10 signs and taking proactive steps, you can manage your blood sugar effectively and reduce your risk of long-term health complications. Your health is worth the effort!

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