Insulin During Illness: What You Need to Know When You're Sick

When you're sick, your body releases stress hormones that make your liver pump out more glucose—no matter how much or little you eat. This is why insulin during illness, the adjusted use of insulin when sick to manage blood sugar spikes caused by stress hormones becomes critical. Even if you're not hungry, skipping insulin can lead to dangerous highs, dehydration, and diabetic ketoacidosis. People with type 1 diabetes are especially at risk, but those with type 2 on insulin need to pay attention too. It's not about eating less—it's about your body fighting infection, fever, or even a cold, and your insulin needs changing because of it.

One of the biggest mistakes is assuming you don't need insulin if you're not eating. That’s wrong. Your body still needs insulin to move glucose out of your blood, even when you're not taking in food. blood sugar control, the ongoing management of glucose levels to prevent complications during health disruptions during illness isn't about perfection—it's about staying in a safe range. Check your blood sugar every 2 to 4 hours. Test for ketones if your blood sugar stays above 240 mg/dL. If you're vomiting, have stomach pain, or feel confused, don't wait—call your doctor. Many people don't realize that even a minor infection like a sinus cold or urinary tract infection can double insulin needs. And if you're on a pump, don't turn it off. Adjust basal rates instead.

sick day rules, a set of practical guidelines for managing diabetes when ill, including insulin adjustments, hydration, and when to seek help aren't just suggestions—they're survival tools. Keep easy-to-digest carbs on hand: broth, gelatin, crackers, or juice if your sugar drops too low. Drink water or sugar-free fluids to avoid dehydration. If you're on long-acting insulin, don't skip it. If you're on rapid-acting insulin, you might need extra doses to handle the spike. Many patients think they should cut insulin because they're not eating, but that’s when they're most likely to end up in the ER. And if you're unsure? Call your endocrinologist. There's no shame in asking. What matters is keeping your numbers from climbing out of control.

You’ll find real stories and clear advice below—how one person handled insulin during the flu, why some people need more insulin when they have a fever, and what to do if your glucose meter gives you conflicting readings. These aren't theoretical tips. They're what works when you're stuck in bed, feeling awful, and your blood sugar won't listen to logic.