Why Won't My Blood Sugar Go Down? 7 Reasons for Stubborn Hyperglycemia

23 Aug 2025

Why Won't My Blood Sugar Go Down? 7 Reasons for Stubborn Hyperglycemia Related reading: What Is Postprandial Blood Sugar Your Guide To Levels After Ea...

Why Won't My Blood Sugar Go Down? 7 Reasons for Stubborn Hyperglycemia

Related reading: What Is Postprandial Blood Sugar Your Guide To Levels After Eating

Dealing with high blood sugar (hyperglycemia) can be frustrating and concerning, especially when it seems like nothing you do is helping. You might be wondering, "Why won't my blood sugar go down?" It's essential to understand the potential reasons behind persistent hyperglycemia to take appropriate action and manage your health effectively. This article explores seven common causes of stubborn high blood sugar and what you can do about them.

1. Inaccurate Carbohydrate Counting

One of the most common reasons for persistently high blood sugar is inaccurate carbohydrate counting. Carbohydrates significantly impact blood glucose levels, and if you're not correctly estimating the carbohydrate content of your meals and snacks, it can lead to hyperglycemia.

  • The Problem: Underestimating carbs means you're not taking enough insulin (if you're on insulin therapy) to cover the carbohydrate load. Overestimating carbs might lead to hypoglycemia (low blood sugar), but more frequently, individuals underestimate.
  • The Solution:
    • Become a Food Label Reader: Pay close attention to nutrition labels and serving sizes.
    • Use a Food Scale: Measure portions accurately, especially for foods like rice, pasta, and cereals.
    • Consider Carb-Counting Apps: Utilize mobile apps designed to track carbohydrate intake. MyFitnessPal, Carb Manager, and Figwee are some excellent options.
    • Consult a Registered Dietitian: A dietitian can provide personalized guidance on carbohydrate counting tailored to your individual needs.

2. Incorrect Insulin Dosage or Timing

For individuals with diabetes using insulin, the correct dosage and timing are crucial for managing blood sugar. If your insulin isn't working as expected, several factors could be at play.

  • The Problem: Not enough insulin to cover meals, or administering insulin too late in relation to meals. Insulin timing depends on the type of insulin. Rapid-acting insulin usually needs to be given 15-20 minutes before eating.
  • The Solution:
    • Review Insulin Delivery Technique: Ensure you're injecting insulin correctly. Rotate injection sites to prevent lipohypertrophy (lumps under the skin) which can affect insulin absorption.
    • Discuss Insulin Timing with Your Doctor: Adjust the timing of your insulin injections based on your meal patterns and blood sugar response.
    • Check Insulin Expiration Dates: Expired insulin may be less effective.
    • Store Insulin Properly: Insulin should be stored in the refrigerator and protected from extreme temperatures.
    • Bolus vs. Basal: Understand the difference. A "bolus" dose covers food intake. A "basal" dose provides background insulin throughout the day. Is one or both incorrect?
    • Insulin Pump Issues: If you use an insulin pump, ensure the site is working correctly and free of kinks.

3. Dawn Phenomenon

The dawn phenomenon is a natural rise in blood sugar that occurs in the early morning hours (typically between 3 AM and 8 AM). It's caused by the release of hormones like cortisol and growth hormone, which increase insulin resistance.

  • The Problem: These hormones trigger the liver to release glucose, leading to higher blood sugar levels in the morning.
  • The Solution:
    • Adjust Insulin Timing: Talk to your doctor about adjusting your insulin dose or timing of your evening dose.
    • Avoid High-Carb Snacks Before Bed: Limit carbohydrate intake in the evening to minimize the overnight rise in blood sugar.
    • Check Blood Sugar Overnight: Monitoring blood sugar levels in the early morning can help determine the extent of the dawn phenomenon and inform treatment adjustments.
    • Consider a Continuous Glucose Monitor (CGM): A CGM can provide real-time glucose readings and alert you to patterns like the dawn phenomenon.

4. Stress and Illness

Stress and illness can significantly impact blood sugar control. When you're stressed or sick, your body releases stress hormones that increase blood glucose levels.

  • The Problem: Stress hormones like cortisol and adrenaline cause the liver to release glucose and make the body less sensitive to insulin.
  • The Solution:
    • Stress Management Techniques: Practice relaxation techniques such as meditation, deep breathing, or yoga to help manage stress levels.
    • Monitor Blood Sugar More Frequently: Check your blood sugar more often when you're sick or stressed, as levels can fluctuate rapidly.
    • Adjust Medication Dosage: Work with your doctor to adjust your medication dosage during periods of stress or illness.
    • Stay Hydrated: Drink plenty of fluids to prevent dehydration, which can worsen hyperglycemia.

5. Medications

Certain medications can raise blood sugar levels, even in people without diabetes. These medications can interfere with insulin sensitivity or directly affect glucose metabolism.

Related reading: The Ultimate Blood Sugar Diet A 7 Day Meal Plan To Control Glucose Levels

  • The Problem: Some common medications known to raise blood sugar include:
    • Corticosteroids: Prednisone, dexamethasone.
    • Diuretics: Thiazide diuretics.
    • Beta-blockers: (May mask symptoms of hypoglycemia, but can sometimes raise blood sugar.)
    • Antipsychotics: Some atypical antipsychotics.
    • Decongestants: Pseudoephedrine.
  • The Solution:
    • Review Medications with Your Doctor: Discuss all medications you're taking with your healthcare provider to identify potential causes of hyperglycemia.
    • Monitor Blood Sugar Closely: If you're taking a medication that can raise blood sugar, monitor your glucose levels more frequently and report any significant changes to your doctor.
    • Consider Alternative Medications: If possible, explore alternative medications that have less of an impact on blood sugar. Do not stop taking prescribed medications without talking to your doctor first.

6. Dehydration

Related reading: The Blood Sugar Diet A Science Backed Plan To Stabilize Your Levels

Dehydration can lead to concentrated blood sugar levels, contributing to hyperglycemia. When you don't have enough fluids in your body, glucose becomes more concentrated in the bloodstream.

  • The Problem: When you're dehydrated, your kidneys work harder to filter glucose, and your body may not be able to effectively remove excess sugar from the blood.
  • The Solution:
    • Drink Plenty of Water: Aim to drink at least 8 glasses of water per day, or more if you're physically active or in a hot environment.
    • Avoid Sugary Drinks: Sugary drinks can exacerbate dehydration and further increase blood sugar levels. Opt for water, unsweetened tea, or herbal infusions.
    • Monitor Urine Color: Pay attention to the color of your urine. Light-colored urine indicates good hydration, while dark urine suggests dehydration.

7. Lack of Physical Activity

Regular physical activity helps lower blood sugar levels by increasing insulin sensitivity and helping your muscles use glucose for energy. A lack of exercise can contribute to insulin resistance and persistent hyperglycemia.

  • The Problem: When you're inactive, your body becomes less responsive to insulin, making it harder for glucose to enter cells and lower blood sugar.
  • The Solution:
    • Aim for Regular Exercise: Aim for at least 150 minutes of moderate-intensity exercise per week, such as brisk walking, cycling, or swimming.
    • Incorporate Resistance Training: Resistance exercises, like weight lifting, can help improve insulin sensitivity and build muscle mass.
    • Break Up Sedentary Time: Avoid prolonged periods of sitting. Stand up and move around every 30 minutes to help regulate blood sugar levels.
    • Time Your Exercise: Be mindful of the timing of your exercise in relation to meals and insulin. Speak with your healthcare provider about how to adjust insulin if necessary.

Summary: Key Actions to Lower Blood Sugar

In conclusion, persistent high blood sugar can stem from various factors, including inaccurate carbohydrate counting, incorrect insulin dosage or timing, the dawn phenomenon, stress and illness, medications, dehydration, and lack of physical activity. Understanding the underlying causes can empower you to take targeted steps to manage your blood sugar more effectively.

Problem Solution
Inaccurate Carb Counting Use food labels, scales, carb-counting apps, and consult a dietitian.
Incorrect Insulin Dosage/Timing Review injection technique, timing, and expiration with your doctor. Ensure proper storage.
Dawn Phenomenon Adjust insulin, avoid late-night carbs, monitor overnight glucose.
Stress and Illness Manage stress, monitor blood sugar more frequently, adjust medication as needed.
Medications Review medications with your doctor; consider alternatives if possible. Never stop a medication without speaking to your doctor first.
Dehydration Drink plenty of water; avoid sugary drinks; monitor urine color.
Lack of Physical Activity Aim for 150 minutes of moderate exercise; incorporate resistance training.

Remember, effectively managing blood sugar levels requires a personalized approach and ongoing collaboration with your healthcare team. Consult your doctor or a certified diabetes educator to develop a comprehensive diabetes management plan that meets your specific needs and goals. They can provide tailored advice on medication adjustments, lifestyle modifications, and blood sugar monitoring strategies. Take proactive steps to optimize your blood sugar control and improve your overall health and well-being.