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Recognizing Hyperglycemia: 9 High Blood Sugar Symptoms You Shouldn’t Ignore
18 Sep 2025 By Ramona S. DeJesus, M.D.

Recognizing Hyperglycemia: 9 High Blood Sugar Symptoms You Shouldn’t Ignore

Hyperglycemia, or high blood sugar, is a condition where there's an excessive amount of glucose in the blood. It's often associated with diabetes but can also occur in people without diabetes under certain circumstances. Recognizing the symptoms of hyperglycemia is crucial for early detection and management, potentially preventing serious complications. This article will explore nine high blood sugar symptoms you shouldn’t ignore, providing insights into why they occur and what actions to take.

Why Recognizing Hyperglycemia Matters

Uncontrolled hyperglycemia can lead to a host of health problems, including:

  • Diabetic ketoacidosis (DKA): A life-threatening condition caused by a buildup of ketones in the blood.
  • Hyperosmolar hyperglycemic state (HHS): A serious condition characterized by extremely high blood sugar levels and dehydration.
  • Long-term complications: Damage to the eyes, kidneys, nerves, and heart over time.

Early recognition and management of high blood sugar can significantly reduce the risk of these complications. Understanding the key symptoms is the first step toward proactive health management.


1. Frequent Urination (Polyuria)

Frequent urination, or polyuria, is one of the earliest and most common signs of hyperglycemia. When blood sugar levels are high, the kidneys work overtime to filter out the excess glucose. This process pulls water from the blood, leading to increased urine production.

  • Why it happens: Elevated glucose levels overwhelm the kidneys' ability to reabsorb glucose, resulting in more water being excreted.
  • What to look for: Waking up multiple times during the night to urinate, or feeling the need to urinate much more often than usual during the day.
  • Actionable advice: If you notice a sudden increase in urination, especially if accompanied by other symptoms on this list, check your blood sugar or consult a healthcare provider.

Example: A person who normally urinates 6-8 times a day starts urinating 12-15 times, including 3-4 times during the night. This significant change should raise suspicion of hyperglycemia.

2. Increased Thirst (Polydipsia)

Closely related to frequent urination is increased thirst, or polydipsia. As the kidneys flush out excess glucose and water, the body becomes dehydrated, triggering the thirst mechanism.

  • Why it happens: Dehydration from polyuria leads to a higher concentration of solutes in the blood, stimulating the thirst center in the brain.
  • What to look for: Feeling constantly thirsty, even after drinking large amounts of fluid, or having a persistently dry mouth.
  • Actionable advice: Monitor your fluid intake and thirst levels. Excessive thirst that doesn't resolve with normal hydration could indicate hyperglycemia.

Data: A study published in the "Journal of Clinical Endocrinology & Metabolism" found that individuals with uncontrolled diabetes often consume significantly more fluids than those with well-managed blood sugar levels.

3. Unexplained Weight Loss

Unexplained weight loss, particularly when accompanied by increased appetite, can be a sign of hyperglycemia, especially in undiagnosed or poorly managed diabetes.

  • Why it happens: When the body can't use glucose for energy due to insulin deficiency or resistance, it starts breaking down muscle and fat for fuel.
  • What to look for: Losing weight without intentionally dieting or increasing physical activity.
  • Actionable advice: If you experience significant unexplained weight loss, consult a doctor for a thorough evaluation.

Example: Someone who loses 10-15 pounds in a few months without any dietary or lifestyle changes should be evaluated for diabetes and other potential underlying conditions.

4. Increased Hunger (Polyphagia)

While it might seem counterintuitive, increased hunger, or polyphagia, can occur alongside hyperglycemia. Even though there's plenty of glucose in the blood, the body's cells aren't able to access it for energy due to insulin-related issues.

  • Why it happens: The lack of glucose uptake by cells triggers hunger signals, as the body perceives itself to be in a state of starvation.
  • What to look for: Feeling constantly hungry, even after eating a full meal, or experiencing an insatiable appetite.
  • Actionable advice: Pay attention to your hunger cues. If you're consistently feeling excessively hungry, especially if paired with other symptoms, seek medical advice.

Scientific research: Studies have shown that hyperglycemia can disrupt the normal hormonal regulation of appetite, leading to increased hunger despite adequate caloric intake.

5. Blurred Vision

Blurred vision is a common symptom of hyperglycemia due to the effect of high blood sugar on the eyes.

  • Why it happens: Elevated glucose levels can cause the lens of the eye to swell, affecting its ability to focus.
  • What to look for: Blurry or distorted vision, difficulty focusing, or seeing halos around lights.
  • Actionable advice: If you experience sudden or persistent blurred vision, consult an eye doctor and check your blood sugar levels.

Example: A person who previously had perfect vision notices that they suddenly need glasses or that their existing glasses no longer provide clear vision.

6. Slow-Healing Sores or Cuts

Slow-healing sores or cuts are a hallmark sign of uncontrolled diabetes and hyperglycemia. Can Stress Cause High Blood Sugar The Answer For Your Health

  • Why it happens: High blood sugar can impair blood circulation and immune function, hindering the body's ability to repair damaged tissues.
  • What to look for: Cuts, bruises, or sores that take significantly longer than usual to heal, or that become easily infected.
  • Actionable advice: Practice good wound care and monitor any cuts or sores closely. If they don't show signs of healing within a reasonable timeframe, consult a healthcare provider.

Data: Studies have demonstrated that individuals with poorly controlled diabetes experience delayed wound healing compared to those with normal blood sugar levels.

7. Fatigue and Weakness

Fatigue and weakness are general symptoms that can be associated with many conditions, including hyperglycemia.

  • Why it happens: When the body's cells aren't getting enough glucose for energy, it can lead to feelings of tiredness and reduced physical stamina.
  • What to look for: Persistent fatigue that doesn't improve with rest, or feeling unusually weak even after minimal exertion.
  • Actionable advice: Assess your overall health and lifestyle. If fatigue is persistent and unexplained, consider checking your blood sugar levels and seeking medical evaluation.

Example: A person who used to easily walk several miles without getting tired now feels exhausted after just a short walk.

8. Dry, Itchy Skin

Dry, itchy skin can be a less obvious but still significant symptom of hyperglycemia.

  • Why it happens: High blood sugar can draw fluid away from the skin, leading to dryness. Additionally, poor circulation caused by hyperglycemia can contribute to skin problems.
  • What to look for: Persistent dry, flaky, or itchy skin, even after moisturizing.
  • Actionable advice: Use gentle, fragrance-free moisturizers and avoid harsh soaps. If dry skin persists or is accompanied by other symptoms, consider checking your blood sugar.

Expert Opinion: Dermatologists often advise patients with persistent skin issues to check their blood sugar levels, especially if they have other risk factors for diabetes.

9. Frequent Infections

Frequent infections, particularly yeast infections or urinary tract infections (UTIs), can be a sign of hyperglycemia.

  • Why it happens: High blood sugar can weaken the immune system, making it harder for the body to fight off infections.
  • What to look for: Recurring infections, such as yeast infections, UTIs, or skin infections, that are difficult to treat.
  • Actionable advice: Practice good hygiene and maintain a healthy lifestyle. If you experience frequent infections, discuss your concerns with a healthcare provider and consider getting tested for diabetes.

Scientific Research: Studies have shown that individuals with diabetes are more susceptible to certain types of infections due to impaired immune function associated with hyperglycemia. Understanding The A1C Blood Sugar Range For Diabetes Management


What to Do If You Suspect Hyperglycemia

If you experience any of the above symptoms, especially in combination, it's essential to take action. Here are some steps to consider:

  1. Check your blood sugar: If you have a blood glucose meter, check your blood sugar levels regularly.
  2. Consult a healthcare provider: Make an appointment with your doctor to discuss your symptoms and get a proper diagnosis.
  3. Follow your doctor's advice: If you're diagnosed with diabetes or hyperglycemia, follow your doctor's recommendations for managing your blood sugar levels, which may include dietary changes, exercise, and medication.

Preventing Hyperglycemia

While some factors that contribute to hyperglycemia are beyond your control, there are several steps you can take to reduce your risk: What Is The A1C Test And How Does It Affect Diabetes Management

  • Maintain a healthy diet: Focus on whole, unprocessed foods, and limit your intake of sugary drinks and refined carbohydrates.
  • Exercise regularly: Aim for at least 150 minutes of moderate-intensity exercise per week.
  • Manage your weight: Maintain a healthy weight to reduce your risk of insulin resistance.
  • Monitor your blood sugar: If you have risk factors for diabetes, such as a family history of the disease, check your blood sugar levels regularly.

Recognizing the symptoms of hyperglycemia is essential for early detection and management. By being aware of these nine key signs, you can take proactive steps to protect your health and prevent serious complications. Always consult with a healthcare provider for accurate diagnosis and personalized treatment plans.

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