Steroid-Induced Diabetes

Overview

Steroid-induced diabetes is high blood sugar (hyperglycemia) that develops as a side effect of taking corticosteroid medications, often called steroids. These drugs, such as prednisone, prednisolone, dexamethasone, and hydrocortisone, are widely used to reduce inflammation and calm the immune system in conditions like asthma, arthritis, and many others. While effective, they can raise blood sugar by making the body more resistant to insulin and prompting the liver to release more glucose.

This can cause new diabetes in people who did not have it before, or worsen blood sugar control in those who already have diabetes. Steroid-induced diabetes often appears during higher-dose or longer courses of steroids. In many people, blood sugar improves or returns to normal after the steroid is reduced or stopped, though some, particularly those already at risk, may go on to develop lasting diabetes.

Symptoms

Symptoms are those of high blood sugar and may be mild at first. They include:

• Increased thirst
• Frequent urination
• Fatigue or low energy
• Blurred vision
• Increased hunger
• Unintended weight changes

A typical pattern is that blood sugar rises most in the afternoon and evening, especially with steroids taken once in the morning. Very high blood sugar can cause dehydration and, rarely, a medical emergency, so significant symptoms should be evaluated. People taking steroids may have blood sugar checked even without symptoms.

Causes

Corticosteroids raise blood sugar through several effects:

• Insulin resistance: Steroids make the body's tissues respond less well to insulin, the hormone that lowers blood sugar.
• Increased glucose production: They prompt the liver to release more glucose into the blood.
• Effects on the pancreas: They can reduce the insulin response to rising blood sugar.

The likelihood and degree of high blood sugar depend on the dose, type, and duration of the steroid, as well as a person's own risk of diabetes.

Risk Factors

• Higher steroid doses or longer treatment courses
• Pre-existing diabetes or prediabetes
• Family history of diabetes
• Overweight or obesity
• Older age
• A history of gestational diabetes

Diagnosis

Steroid-induced diabetes is identified by checking blood sugar in people taking steroids:

• Blood glucose testing: Random or fasting blood sugar, with attention to afternoon and evening levels, which often rise most.
• Home monitoring: Self-checks with a glucose meter, especially later in the day, may detect rises that fasting tests miss.
• A1C test: Reflects average blood sugar over recent months, though it may lag behind a recent steroid-related rise.
• Review of medications: Linking the high blood sugar to the steroid and its dose and timing.

Treatment

Treatment aims to control blood sugar while the steroid is needed and to adjust care as the dose changes. A healthcare team guides decisions.

• Adjusting the steroid when possible: Using the lowest effective dose, or tapering it as the underlying condition allows (never stop steroids abruptly without medical advice).
• Monitoring blood sugar: Regular checks, often focused on later in the day.
• Medication for blood sugar: Oral diabetes medicines or insulin, with insulin often preferred for higher steroid doses; doses may be adjusted as the steroid changes.
• Diet and activity: A balanced eating plan and physical activity support control.

As the steroid is reduced or stopped, blood sugar often improves, and diabetes treatment may be scaled back to avoid low blood sugar.

Prevention

• Use the lowest effective steroid dose for the shortest needed time
• Tell your doctor if you have diabetes, prediabetes, or risk factors before starting steroids
• Monitor blood sugar as advised when taking steroids, especially at higher doses
• Maintain a balanced diet and stay active
• Report symptoms of high blood sugar promptly
• Never stop steroids suddenly on your own, as this can be dangerous

When to See a Doctor

Contact your healthcare provider if, while taking steroids, you have increased thirst, frequent urination, blurred vision, or fatigue, or if home blood sugar readings are high. Seek urgent care for:

• Very high blood sugar readings
• Severe thirst with frequent urination and dehydration
• Confusion, drowsiness, or rapid breathing
• Nausea and vomiting that prevent you from keeping fluids down

These can signal dangerously high blood sugar that needs prompt treatment.

Related Topics

Frequently Asked Questions

References

1. MedlinePlus, U.S. National Library of Medicine. Prednisone and corticosteroids.
2. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Diabetes overview.
3. American Diabetes Association. Steroids and blood glucose.
4. Mayo Clinic. Prednisone and other corticosteroids.