Understanding Gestational Diabetes: Symptoms, Causes, and Management

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MotherhoodIndia Team

Trusted guidance on women’s health, pregnancy and child care from the MotherhoodIndia team, helping families make informed healthcare choices.

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Gestational diabetes is high blood sugar that develops during pregnancy in someone who did not have diabetes before pregnancy. It is usually identified through routine glucose screening because many women have few or no noticeable symptoms. With regular monitoring, appropriate nutrition, physical activity and medication when required, gestational diabetes can often be managed effectively throughout pregnancy.

Symptoms of Gestational Diabetes

Gestational diabetes often causes no obvious symptoms, which is why routine screening during pregnancy is important.

When symptoms do occur, they may include:

• increased thirst
• needing to urinate more often
• unusual tiredness
• blurred vision
• recurrent infections in some women

These symptoms can also occur for reasons unrelated to gestational diabetes, and many women with the condition feel completely well.

Gestational diabetes is therefore usually identified through blood glucose testing rather than symptoms alone. Screening is commonly performed during the second trimester, although women with certain risk factors may be tested earlier.

If you are pregnant and notice unusual thirst, marked fatigue or other symptoms that concern you, discuss them with your obstetrician rather than waiting for a routine appointment.

What Causes Gestational Diabetes?

During pregnancy, the placenta produces hormones that support the baby’s growth. These hormones can also make the mother’s body less responsive to insulin, a hormone that helps move glucose from the blood into the body’s cells.

This increase in insulin resistance is a normal part of pregnancy. In some women, however, the pancreas cannot produce enough additional insulin to keep blood glucose within the expected range. When this happens, gestational diabetes develops.

Several factors can increase the likelihood of gestational diabetes, including:

• a previous pregnancy with gestational diabetes
• a family history of diabetes
• being overweight before pregnancy
• polycystic ovary syndrome (PCOS)
• having previously delivered a larger-than-average baby
• increasing maternal age
• South Asian and some other ethnic backgrounds associated with a higher risk of type 2 diabetes
• significant weight gain between pregnancies

Having one or more of these risk factors does not mean that gestational diabetes will definitely develop. It can also occur in women without obvious risk factors, which is another reason routine screening is important.

How Gestational Diabetes Is Diagnosed

Gestational diabetes is usually diagnosed using a glucose test during pregnancy.

Screening is commonly performed between about 24 and 28 weeks, although women at higher risk may be tested earlier. The exact test and diagnostic thresholds used can vary depending on local clinical protocols.

An oral glucose tolerance test may be used to measure how the body handles glucose over a set period. If the results meet the diagnostic criteria for gestational diabetes, the healthcare team will usually discuss blood glucose monitoring, dietary changes and any additional treatment required.

Diagnosis is not based on symptoms alone. A woman can have gestational diabetes even when she feels completely well.

How Gestational Diabetes Is Treated

Gestational diabetes treatment focuses on keeping blood glucose within the target range recommended by the treating team while supporting healthy maternal and fetal growth.

Management may include several approaches.

Blood glucose monitoring: Women may be asked to check their blood sugar at specific times of day. These readings help the healthcare team understand how food, activity and treatment are affecting glucose levels.

Dietary changes: Meals are usually planned to provide balanced nutrition while managing the amount and timing of carbohydrates. The aim is not to eliminate carbohydrates completely, but to choose appropriate portions and distribute them across the day.

Physical activity: Regular activity may help improve insulin sensitivity when it is safe during pregnancy. The type and amount of exercise should follow advice from the obstetrician, particularly in women with other pregnancy complications.

Medication or insulin: Some women need medication or insulin when nutrition and activity changes are not enough to control blood glucose. The choice of treatment depends on individual clinical factors and should be guided by the treating doctor.

Women with gestational diabetes may also need additional monitoring of the baby’s growth and wellbeing during pregnancy.

For a broader overview of managing diabetes during pregnancy, it is useful to understand how blood glucose management fits into antenatal care.

Gestational Diabetes Diet: General Guidance

There is no single gestational diabetes diet that is suitable for every pregnant woman. Meal planning should take into account blood glucose readings, nutritional needs, weight, activity level and other medical factors.

General guidance often includes:

• eating balanced meals at regular times
• spreading carbohydrate intake across meals and snacks
• choosing whole grains and higher-fibre carbohydrates where appropriate
• including vegetables, protein and healthy fats with meals
• limiting foods and drinks that cause rapid rises in blood glucose
• avoiding long periods without food unless advised otherwise
• staying adequately hydrated

Carbohydrates are still an important source of energy during pregnancy, so the goal is usually appropriate portioning rather than avoiding them altogether.

A dietitian or healthcare professional can help tailor meal patterns to individual needs. Specific carbohydrate targets, calorie plans or restrictive diets should not be followed without professional guidance during pregnancy.

Is Gestational Diabetes Bad for the Baby?

Gestational diabetes does not automatically mean that the baby will have complications. When blood glucose is well managed and pregnancy is monitored appropriately, many women with gestational diabetes have healthy pregnancies and babies.

However, poorly controlled blood glucose can increase the likelihood of certain complications, including:

• a larger-than-average baby
• a more difficult delivery
• a greater chance of Caesarean delivery in some situations
• low blood sugar in the baby shortly after birth
• jaundice
• breathing difficulties in some newborns
• a higher long-term risk of obesity or type 2 diabetes for the child

The mother’s health can also be affected. Gestational diabetes is associated with a higher risk of high blood pressure and preeclampsia, and it increases the mother’s future risk of developing type 2 diabetes.

These risks are the reason regular monitoring and treatment matter. They are not a prediction that complications will definitely occur.

Can Gestational Diabetes Be Reduced or Better Managed?

Once gestational diabetes develops, the goal is usually management rather than trying to “cure” it during pregnancy.

Blood glucose levels can often be improved through:

• following an individualised meal plan
• monitoring blood glucose as advised
• remaining physically active when medically appropriate
• attending regular antenatal appointments
• taking medication or insulin if prescribed
• monitoring weight gain during pregnancy
• following recommendations for fetal growth and wellbeing checks

It is important not to blame yourself for developing gestational diabetes. Pregnancy-related hormonal changes play a major role, and some women develop the condition despite following a healthy lifestyle.

These practical tips to tackle gestational diabetes can complement the personalised plan provided by your obstetrician or diabetes-care team.

After Delivery: Does Gestational Diabetes Go Away?

For many women, blood glucose returns to the non-pregnant range after delivery because the pregnancy-related hormonal changes that caused insulin resistance reduce.

However, having gestational diabetes increases the future risk of developing type 2 diabetes. Postpartum glucose testing is therefore important even if blood sugar levels appear to have returned to normal.

Your doctor may recommend a glucose test after delivery and ongoing diabetes screening at intervals in the years that follow.

Healthy eating, regular physical activity and maintaining a healthy weight can support long-term metabolic health after pregnancy.

FAQs on Gestational Diabetes