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

23 Aug 2025

What Are the Symptoms of High Blood Sugar? 10 Signs to Watch For Understanding the signs of high blood sugar, also known as hyperglycemia, is crucial ...

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

Understanding the signs of high blood sugar, also known as hyperglycemia, is crucial for maintaining overall health. Untreated, prolonged hyperglycemia can lead to serious health complications. Recognizing these symptoms early allows for timely intervention and management, often preventing long-term damage. Let's delve into 10 key signs that could indicate elevated blood sugar levels.

1. Frequent Urination (Polyuria)

One of the most common indicators of high blood sugar is frequent urination. When there's excess glucose in the bloodstream, the kidneys try to filter it out. This process draws more water into the urine, increasing both the frequency and volume of urination. You might find yourself needing to go to the bathroom much more often, even during the night (nocturia).

2. Increased Thirst (Polydipsia)

Closely related to frequent urination is increased thirst. As your body loses fluids through excessive urination, you’ll naturally feel more thirsty. This intense thirst, called polydipsia, is the body's attempt to replenish the lost fluids and maintain proper hydration. Pay attention if you find yourself constantly reaching for water or other beverages.

3. Unexplained Weight Loss

Related reading: Mastering The Fasting Blood Sugar Test For An Accurate Diagnosis

Unexplained weight loss, despite normal or increased eating habits, can be a warning sign of hyperglycemia. When your body can't effectively use glucose for energy (due to insulin resistance or deficiency), it may start breaking down muscle and fat for fuel. This leads to a decrease in body weight, often without any intentional dietary changes.

4. Increased Hunger (Polyphagia)

Despite having high blood sugar, your cells may not be receiving the energy they need. This can lead to increased hunger, known as polyphagia. The body perceives a lack of energy and triggers feelings of intense hunger in an attempt to obtain more glucose, which it then struggles to process effectively.

5. Blurred Vision

Blurred vision is another common symptom associated with hyperglycemia. High glucose levels can affect the lens of the eye, causing it to swell and distort your vision. This distortion can lead to temporary blurring, difficulty focusing, or changes in your refractive error. While often reversible with blood sugar control, prolonged hyperglycemia can lead to more serious eye damage.

6. Fatigue and Weakness

Feeling constantly tired or weak can be a sign of high blood sugar. When glucose can't enter the cells to provide energy, the body feels sluggish and depleted. This fatigue isn't the same as normal tiredness; it's a persistent lack of energy that doesn't improve with rest. This symptom can significantly impact your daily life and productivity.

7. Slow-Healing Cuts and Sores

Slow-healing cuts and sores are indicative of impaired blood flow and immune function, both often associated with hyperglycemia. High glucose levels can damage blood vessels, hindering the transport of nutrients and immune cells to the wound site. This delayed healing increases the risk of infection and complications.

Related reading: What Is A Normal Blood Sugar For Non Diabetics After Eating

8. Frequent Infections

Hyperglycemia can weaken the immune system, making individuals more susceptible to frequent infections. High glucose levels provide a favorable environment for bacterial and fungal growth, increasing the risk of infections in the skin, urinary tract, and other areas of the body. Recurrent infections, especially those difficult to treat, should prompt an evaluation of blood sugar levels.

9. Dry, Itchy Skin

Dry, itchy skin can be a subtle yet telling sign of high blood sugar. Elevated glucose levels can draw moisture from the skin, leading to dryness and itchiness. Additionally, impaired circulation due to hyperglycemia can further exacerbate skin problems. While common, persistent dry and itchy skin should be evaluated in the context of other potential hyperglycemia symptoms.

10. Numbness or Tingling in Hands and Feet (Neuropathy)

Related reading: Manage Your Blood Sugar A Daily Routine For Stable Glucose Levels

Numbness or tingling in the hands and feet, known as peripheral neuropathy, is a more advanced symptom of long-term hyperglycemia. High glucose levels can damage nerves over time, leading to these sensations. This nerve damage can progress and eventually lead to chronic pain, loss of sensation, and even foot ulcers.

When to Seek Medical Attention

If you experience one or more of these symptoms, it's essential to consult with a healthcare professional for proper evaluation and diagnosis. Early detection and management of high blood sugar are crucial to prevent complications and maintain overall health. A blood glucose test can easily determine your blood sugar levels and guide appropriate treatment strategies.

Monitoring Blood Sugar Levels

Regular monitoring blood sugar levels can help you understand how your body responds to various factors such as diet, exercise, and stress. This insight allows you to make informed decisions about your lifestyle and treatment plan, ultimately contributing to better blood sugar control and overall well-being.

Summary of High Blood Sugar Symptoms

Symptom Description
Frequent Urination (Polyuria) Increased need to urinate, especially at night.
Increased Thirst (Polydipsia) Feeling extremely thirsty, even after drinking.
Unexplained Weight Loss Losing weight without dieting or exercising.
Increased Hunger (Polyphagia) Feeling very hungry, even after eating.
Blurred Vision Difficulty focusing or seeing clearly.
Fatigue and Weakness Feeling unusually tired or weak.
Slow-Healing Cuts and Sores Cuts and sores taking longer to heal.
Frequent Infections Recurring infections, such as urinary tract or skin infections.
Dry, Itchy Skin Skin feeling dry and itchy.
Numbness or Tingling in Hands and Feet (Neuropathy) Tingling, numbness, or pain in the extremities.