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How to Manage Blood Sugar When You're Sick: A Guide for Persons with Diabetes
18 Sep 2025 By Rachael C. Passmore, D.O.

How to Manage Blood Sugar When You're Sick: A Guide for Persons with Diabetes

Being sick can throw your blood sugar levels into disarray, especially if you have diabetes. When you're ill, your body releases hormones to fight the infection, which can significantly raise your blood glucose. This guide provides practical tips for managing your blood sugar effectively when you're under the weather. A Calmer Approach To Diabetes Management Tips For Stress Free Blood Sugar Control

Why Sickness Affects Blood Sugar

When you're sick, your body undergoes physiological changes that can impact your blood glucose levels. These changes primarily occur due to the body’s natural response to infection or illness. Understanding these mechanisms helps in effective blood sugar management:

  • Hormonal Changes: Your body releases stress hormones like cortisol and adrenaline to combat the illness. These hormones can make your cells less sensitive to insulin, leading to higher blood sugar levels.
  • Inflammation: Illness often triggers inflammation, which further reduces insulin sensitivity. This means your body needs more insulin to process the same amount of glucose.
  • Changes in Appetite: Sickness can affect your appetite. You might eat less, leading to low blood sugar, or eat more comfort foods high in sugar, which can raise it. Dehydration can also occur if you are not drinking enough fluids. Dehydration makes it harder for the kidneys to get rid of the excess glucose.
  • Medication Interactions: Some medications, like decongestants and steroids, can raise blood sugar levels, complicating diabetes management.
  • Physical Inactivity: When you’re ill, you're likely less active. Exercise usually helps lower blood sugar, so reduced activity can cause levels to rise.

These factors make it crucial to monitor your blood sugar levels more frequently when sick and adjust your treatment plan as necessary. Staying informed and proactive is key to managing diabetes effectively during illnesses.

Monitoring Your Blood Sugar: The First Line of Defense

Consistent blood sugar monitoring is crucial, especially when you're sick. More frequent checks provide the data needed to make informed decisions about your insulin or oral medication dosages. Aim to check your blood sugar:

  • Every 2-4 hours: This frequency allows you to track changes effectively.
  • Before meals: Helps you determine if your levels are in the target range before eating.
  • Before bed: Ensures your levels are stable overnight.

Keep a log of your readings to identify patterns and discuss them with your healthcare provider. If you use a Continuous Glucose Monitor (CGM), pay close attention to the readings and trends.

Adjusting Your Insulin or Medication

Depending on your blood sugar readings and your doctor’s recommendations, you might need to adjust your insulin or oral medication. Here are some general guidelines:

  • High Blood Sugar: If your blood sugar is consistently high, your doctor may advise increasing your insulin dosage.
  • Low Blood Sugar: If your blood sugar is consistently low, your doctor may advise decreasing your insulin dosage or adjusting your meal plan.
  • Consult Your Healthcare Provider: Never make significant changes to your medication without consulting your healthcare provider. They can provide personalized advice based on your condition.

Staying Hydrated: A Key Element

Staying well-hydrated is essential when you’re sick, as dehydration can further elevate blood sugar levels. Water helps your kidneys flush out excess glucose. Aim to drink plenty of fluids, such as:

  • Water: The best option for hydration.
  • Sugar-free Drinks: Unsweetened tea, sparkling water, or diet sodas can help.
  • Broth: Provides hydration and electrolytes.
  • Electrolyte drinks: Gatorade Zero or Pedialyte can help replace lost electrolytes, but be mindful of sugar content. Choose sugar-free options when possible.

Avoid sugary drinks like soda, juice, and sweetened sports drinks, as they can rapidly raise your blood sugar.

Eating Smart: What to Eat When You’re Sick

When you’re ill, it’s still important to maintain a consistent eating schedule, even if your appetite is reduced. Opt for easy-to-digest foods that won’t drastically impact your blood sugar levels. Good choices include: Simple Hacks To Stabilize Blood Sugar And Boost Your Energy

  • Bland Foods: Crackers, toast, and plain rice are gentle on the stomach.
  • Soup: Chicken noodle soup or broth-based soups provide hydration and nutrients.
  • Small, Frequent Meals: Eating smaller portions more often can help prevent blood sugar spikes.

If you're struggling to eat solid food, try liquid options like:

  • Sugar-Free Protein Shakes: Provides protein and nutrients.
  • Clear Broths: Easy to digest and hydrating.

Managing Ketones: When to Test and What to Do

When your body doesn’t have enough insulin to use glucose for energy, it starts breaking down fat, producing ketones. High ketone levels can lead to a dangerous condition called diabetic ketoacidosis (DKA). Monitor ketone levels using a urine ketone test kit, available at most pharmacies. Check for ketones if:

  • Your blood sugar is consistently above 240 mg/dL.
  • You have symptoms of DKA, such as nausea, vomiting, abdominal pain, or fruity-smelling breath.

If ketones are present:

  • Drink Plenty of Fluids: This helps flush out ketones.
  • Contact Your Healthcare Provider Immediately: DKA requires immediate medical attention.

Recognizing Danger Signs and When to Seek Medical Help

Knowing when to seek medical assistance is crucial for managing diabetes during illness. Contact your healthcare provider if you experience any of the following: Achieve Stable Blood Sugar And More Energy A Practical Guide

  • Persistent High Blood Sugar: Readings consistently above 300 mg/dL, despite adjustments to your medication.
  • High Ketone Levels: Moderate to high ketones in your urine.
  • Severe Symptoms: Persistent vomiting, diarrhea, severe abdominal pain, difficulty breathing, confusion, or inability to keep down fluids.
  • Symptoms of DKA: Fruity-smelling breath, rapid breathing, nausea, or vomiting.

Don't hesitate to seek medical attention promptly. Early intervention can prevent serious complications.

Over-the-Counter Medications: Use with Caution

Many over-the-counter (OTC) medications can affect blood sugar levels. Be cautious when using decongestants, cough syrups, and pain relievers.

  • Decongestants: Some decongestants contain ingredients that can raise blood sugar. Opt for sugar-free versions and monitor your blood sugar closely.
  • Cough Syrups: Many cough syrups are high in sugar. Look for sugar-free alternatives or use cough drops instead.
  • Pain Relievers: Some pain relievers may contain sugar. Choose sugar-free options or pills instead of liquid formulations.

Always read the labels carefully and consult your pharmacist if you have any questions.

Creating a Sick-Day Plan

Developing a sick-day plan in advance can make managing diabetes during illness much easier. Your plan should include:

  1. Contact Information: Phone numbers for your healthcare provider, pharmacy, and emergency contacts.
  2. Medication List: A list of all your medications, including dosages and instructions.
  3. Blood Sugar Monitoring Schedule: A schedule for checking your blood sugar, including target ranges.
  4. Ketone Testing Guidelines: Instructions on when and how to test for ketones.
  5. Food and Fluid Recommendations: A list of suitable foods and fluids to consume when sick.
  6. Adjusting Medication Doses: Guidelines for adjusting your insulin or oral medication, as instructed by your doctor.

Communicating with Your Healthcare Team

Maintaining open communication with your healthcare team is crucial. Inform them about any illnesses, symptoms, and blood sugar fluctuations. They can provide personalized guidance and make necessary adjustments to your treatment plan.

The Importance of Rest and Recovery

Finally, don't underestimate the importance of rest and recovery. Getting enough sleep allows your body to heal and recover. Avoid strenuous activities and focus on resting until you feel better.

Key Things to Remember

Key Area Action
Monitoring Blood Sugar Check every 2-4 hours, before meals, and before bed.
Medication Adjustment Adjust insulin or oral medication as directed by your healthcare provider.
Hydration Drink plenty of sugar-free fluids.
Diet Eat small, frequent meals of easily digestible foods.
Ketone Monitoring Test for ketones if blood sugar is high or if symptoms of DKA are present.
Medical Assistance Seek immediate medical attention if you experience severe symptoms or high ketone levels.

By following these guidelines, you can effectively manage your blood sugar when you’re sick and minimize the risk of complications. Remember to always consult your healthcare provider for personalized advice and treatment. Managing your diabetes proactively during illnesses will help you stay healthy and recover more quickly.

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