What are the symptoms of gestational diabetes?

Written by Gan Jun
Endocrinology
Updated on May 18, 2025
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Patients with gestational diabetes have different constitutions, ages, and weights, so their clinical symptoms also vary greatly. The more typical symptoms include the obvious "three polys and one less," namely polyuria, polydipsia, polyphagia, and unintended weight loss. Pregnant women are prone to recurrent vulvar infections and itching. Some patients with gestational diabetes may not show obvious symptoms, while others may experience a series of adverse symptoms such as excessive amniotic fluid, vulvar itching, and ketoacidosis. If blood sugar is not well-controlled during pregnancy, it can cause delayed growth and development of the fetus. Gestational diabetes can pose significant risks to both the fetus and the pregnant woman. Therefore, timely diet, exercise, and appropriate insulin treatment should be administered.

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How to self-test for gestational diabetes

Gestational diabetes refers to conditions where there was no diabetes before pregnancy, and during the course of the pregnancy, specifically between the 24th to 28th weeks, a standard glucose tolerance test is conducted to screen for glucose metabolism. The specific procedure involves not eating after 8 p.m. the night before, though drinking water is allowed, followed by fasting for more than ten hours. The first blood sample is taken on an empty stomach. Then, 75 grams of anhydrous glucose, as prescribed by the doctor, is dissolved in 250 to 350 milliliters of water and consumed within 3 to 5 minutes. Starting from the first sip of this glucose solution, blood samples are taken again one hour and two hours later. The results from these three blood samples are used to determine the possibility of gestational diabetes.

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Does gestational diabetes require early delivery?

Patients with gestational diabetes primarily have higher blood sugar levels compared to normal pregnant women. For such individuals, strict blood sugar control is generally required. Poor control of blood sugar can significantly impact the baby and pose dangers during childbirth. However, for those patients with well-controlled gestational diabetes, it is possible to carry the pregnancy to full term without the need for early delivery. Early delivery, leading to a premature birth, can have a greater detrimental effect on the infant than the effects caused by high blood sugar. Therefore, patients with gestational diabetes do not need to deliver early. They can manage their condition through strict dietary control, including fetal monitoring and close monitoring of the baby’s vital signs, considering delivery only after reaching full term.

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Can pregnant women with gestational diabetes eat grapes?

Fruits are natural vitamins, and consuming fruits appropriately during pregnancy is extremely significant for supplementing vitamins, which can promote fetal growth. Patients with gestational diabetes are not entirely forbidden from eating fruits; however, it's essential to control the intake of fruits, ideally between 100 to 150 grams per day. Grapes are not completely off-limits, but since grapes have a high sugar content, if consumed, the quantity should be controlled to avoid eating too much. Opting for fruits like kiwis and apples, which have lower sugar content, is a better choice for those with gestational diabetes during pregnancy. Gestational diabetes can affect both the pregnant woman and the fetus. For the pregnant woman, it can increase the rate of miscarriages and is likely to complicate with gestational hypertension. Lowered immunity can lead to infections, particularly urinary and reproductive system infections, may cause excessive amniotic fluid, and increase the likelihood of difficult labor due to a larger baby. The impact on the fetus can lead to congenital disabilities, a significantly large baby, or restricted fetal growth, so it is crucial to control blood sugar levels during pregnancy. While ensuring the pregnant woman is not hungry, insulin can be used when necessary to maintain stable blood sugar levels during pregnancy.

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Gestational diabetes manifestations

Gestational diabetes refers to hyperglycemia that either develops or is first identified during pregnancy, including previously unrecognized glucose intolerance and diabetes prior to pregnancy. Typical symptoms of gestational diabetes include frequent urination, increased thirst, and increased hunger, or recurrent vulvovaginal candidiasis. High vigilance for gestational diabetes is warranted if the pregnant woman weighs over 90 kilograms, or if the current pregnancy is complicated by excessive amniotic fluid or a macrosomic fetus. The danger of this condition is that, in severe cases or where blood sugar control is poor, it can easily lead to miscarriage and preterm birth, as well as infections, and in severe cases, may lead to ketoacidosis. Treatment involves two aspects: one is dietary control, and for patients who cannot control their diet effectively, insulin treatment can be used. (Medication should be used under the guidance of a doctor.)

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The dangers of gestational diabetes

The harms of gestational diabetes mainly include two aspects: the effects on the child and the effects on the pregnant woman herself. For the fetus, the early impacts mainly manifest as spontaneous miscarriage, fetal abnormalities, abnormal fetal development, macrosomia, and delayed maturation of fetal lungs. At birth, this may lead to complications such as premature birth and hypoglycemia. Newborns face a higher risk of respiratory distress syndrome compared to healthy infants. The long-term effects on the child mainly include a significantly increased incidence of glucose intolerance and diabetes, increased risk of obesity, and notable rise in cardiovascular abnormalities and neuromotor developmental disorders. For the mother, the impacts mainly manifest as concurrent miscarriage, gestational hypertension and pre-eclampsia, an increased likelihood of diabetic ketoacidosis. A macrosomic fetus can lead to difficult labor, trauma to the birth canal, prolonged surgical labor, postpartum hemorrhage, and an increased risk of gestational diabetes in subsequent pregnancies, extended hospital stays, and a significantly increased incidence of Type 2 diabetes postpartum.