Skip to main content
EndocrineICD-10: O24.4Affects approximately 2–10% of pregnancies in the United States

Gestational Diabetes

Also known as: Gestational Diabetes Mellitus, GDM

Gestational diabetes is a form of high blood sugar that develops during pregnancy in women who did not have diabetes before. It typically develops in the second or third trimester when placental hormones interfere with insulin action. With proper management, most women have healthy pregnancies, but it increases the future risk of type 2 diabetes.

Symptoms

Often asymptomatic (detected through routine screening)
Increased thirst
Frequent urination
Fatigue
Nausea
Blurred vision
Frequent infections

Causes

  • Insulin resistance caused by placental hormones
  • Inability of the pancreas to produce enough insulin to overcome resistance
  • Genetic predisposition to insulin resistance

Risk Factors

  • Overweight or obesity before pregnancy (BMI ≥25)
  • Age over 25
  • Family history of type 2 diabetes
  • Previous gestational diabetes
  • Polycystic ovary syndrome
  • African American, Hispanic, Native American, Asian, or Pacific Islander descent

Diagnosis

  • Glucose challenge test (GCT) at 24–28 weeks of pregnancy
  • Oral glucose tolerance test (OGTT) for confirmation
  • Early screening for high-risk women at the first prenatal visit
  • Hemoglobin A1c to detect pre-existing diabetes

Treatment

  • Medical nutrition therapy with controlled carbohydrate intake
  • Regular physical activity as recommended by your provider
  • Blood glucose self-monitoring (fasting and post-meal levels)
  • Insulin therapy if diet and exercise do not achieve targets
  • Metformin or glyburide as alternatives in some cases
  • Increased fetal monitoring and delivery planning

Prevention

  • Achieve a healthy weight before pregnancy
  • Eat a balanced, nutrient-rich diet
  • Exercise regularly before and during pregnancy

When to See a Doctor

  • You are pregnant and have risk factors for gestational diabetes
  • Routine screening tests show elevated blood sugar
  • You experience increased thirst, urination, or fatigue during pregnancy
  • You had gestational diabetes in a previous pregnancy

Frequently Asked Questions

Related Conditions

Have questions about Gestational Diabetes?

Ask Mother Nature AI for personalized, evidence-based guidance.

Ask about Gestational Diabetes

Medical Disclaimer: This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.

Content reviewed against peer-reviewed medical literature and clinical guidelines. Read our editorial standards.