Surprising Symptoms of High Blood Sugar (Hyperglycemia)

23 Aug 2025

Surprising Symptoms of High Blood Sugar (Hyperglycemia) High blood sugar, or hyperglycemia, is a condition that occurs when there is too much glucose ...

Surprising Symptoms of High Blood Sugar (Hyperglycemia)

High blood sugar, or hyperglycemia, is a condition that occurs when there is too much glucose in the blood. While many people associate high blood sugar with obvious symptoms like frequent urination and increased thirst, there are several less-known, surprising signs that could indicate your blood sugar levels are elevated. Recognizing these surprising symptoms early can lead to timely diagnosis and management of diabetes or other related conditions.

Understanding High Blood Sugar and Its Causes

Before diving into the surprising symptoms, it's essential to understand what causes high blood sugar. It primarily happens when the body doesn't produce enough insulin (in the case of type 1 diabetes) or when the body can't effectively use the insulin it produces (in the case of type 2 diabetes). Other factors that can contribute to hyperglycemia include:

  • Diet: Consuming a diet high in carbohydrates and sugary drinks.
  • Lack of Physical Activity: Not exercising regularly can impact insulin sensitivity.
  • Stress: Stress hormones can raise blood sugar levels.
  • Illness: Infections and illnesses can temporarily increase blood sugar.
  • Medications: Certain medications can affect blood sugar control.

Now, let's explore some of the surprising symptoms of high blood sugar that you might not expect.

Surprising Symptoms of Hyperglycemia

While frequent urination, increased thirst, and unexplained weight loss are classic signs of hyperglycemia, here are some lesser-known symptoms to watch out for:

1. Blurred Vision

Related reading: Easy And Delicious Blood Sugar Friendly Meals

While many people know about diabetic retinopathy as a long-term complication, blurred vision can be a more immediate symptom of high blood sugar. When glucose levels are high, it can cause fluid to be pulled from the tissues, including the lenses of your eyes. This can lead to temporary blurring of vision until blood sugar levels are normalized.

2. Frequent Infections

High blood sugar can weaken the immune system, making individuals more susceptible to infections. Frequent infections, especially yeast infections (such as thrush), urinary tract infections (UTIs), and skin infections, can be a sign that your blood sugar levels are consistently elevated. Bacteria and yeast thrive in environments with high glucose levels.

3. Dry, Itchy Skin

Chronically dry and itchy skin can be a subtle indicator of hyperglycemia. High blood sugar can damage blood vessels and nerves, leading to reduced circulation. Poor circulation can, in turn, lead to dry skin. Also, the itchiness may be a result of yeast infections that thrive on high glucose levels or decreased sweat production due to nerve damage.

4. Slow-Healing Cuts and Bruises

If you notice that your cuts and bruises take significantly longer to heal than usual, it could be a sign of high blood sugar. Elevated glucose levels can impair blood circulation and nerve function, both of which are vital for the healing process. Reduced blood flow means essential nutrients and oxygen are not delivered to the affected areas as efficiently.

5. Fatigue and Irritability

While everyone experiences fatigue occasionally, persistent and unexplained fatigue coupled with irritability can point to hyperglycemia. When your body can't properly use glucose for energy, it can leave you feeling tired and sluggish. Furthermore, fluctuations in blood sugar levels can affect mood and lead to irritability.

6. Tingling or Numbness in Hands and Feet

Related reading: How To Stabilize Blood Sugar And End Afternoon Energy Crashes

This symptom, known as peripheral neuropathy, is more often associated with long-term diabetes. However, even moderately high blood sugar levels over time can contribute to nerve damage, leading to tingling, numbness, or pain in the hands and feet. This can be a subtle early warning sign.

7. Gastroparesis (Delayed Stomach Emptying)

Hyperglycemia can damage the vagus nerve, which controls stomach muscle movement. This can result in gastroparesis, a condition where the stomach empties too slowly. Symptoms may include nausea, vomiting, bloating, abdominal pain, and a feeling of fullness even after eating small amounts.

When to Seek Medical Attention

It’s essential to consult a healthcare professional if you experience several of these surprising symptoms of high blood sugar, especially if they persist or worsen. A simple blood glucose test can determine your blood sugar level and help diagnose diabetes or pre-diabetes.

Symptom Potential Cause Action
Blurred Vision Fluid shift in the eyes due to **high blood sugar** Consult a doctor for blood glucose test
Frequent Infections Weakened immune system Rule out diabetes or pre-diabetes with medical tests
Dry, Itchy Skin Poor circulation and potential yeast infections Monitor blood sugar levels; see a dermatologist if necessary
Slow-Healing Cuts/Bruises Impaired blood circulation and nerve function Assess blood glucose levels; optimize wound care
Fatigue & Irritability Inability to use glucose for energy Get screened for diabetes or pre-diabetes
Tingling/Numbness Nerve Damage Consult with a Doctor for potential Diabetic neuropathy
Gastroparesis Damage to Vagus Nerve Check glucose level to manage diabetes

Managing and Preventing High Blood Sugar

Related reading: The Best Exercises For Lowering Blood Sugar With Type 2 Diabetes

If you're diagnosed with high blood sugar, or at risk for it, there are several strategies you can implement to manage and prevent it:

  • Dietary Changes: Follow a balanced diet that is low in refined carbohydrates and sugars. Focus on whole grains, lean proteins, fruits, and vegetables.
  • Regular Exercise: Engage in regular physical activity to improve insulin sensitivity and help regulate blood sugar levels.
  • Medication: If lifestyle changes are not enough, your doctor may prescribe medications like metformin or insulin to help control blood sugar.
  • Stress Management: Practice stress-reduction techniques such as yoga, meditation, or deep breathing exercises.
  • Regular Monitoring: Monitor your blood sugar levels regularly, especially if you have diabetes, to identify trends and make necessary adjustments.

By recognizing the surprising symptoms of high blood sugar and taking proactive steps to manage and prevent it, you can significantly reduce your risk of developing serious health complications. Early detection and management are key to maintaining optimal health.