Gestational diabetes symptoms

By trimester

Weeks 1–13

1st trimester

Gestational diabetes develops from a hormonal shift that builds through pregnancy, so it is not typically screened for this early. If you have risk factors like a prior history of gestational diabetes or a strong family history of diabetes, your provider may test earlier than the standard window.

Weeks 14–27

2nd trimester

The standard screening window, 24 to 28 weeks, falls in the second trimester. This test catches the great majority of cases, since most people have no symptoms at all to notice on their own.

Weeks 28–birth

3rd trimester

If you have gestational diabetes, the third trimester is when blood sugar management, whether through diet, activity, or medication, and monitoring the baby's growth become the focus. Unusual thirst, frequent urination, or feeling unwell are still worth mentioning at a visit even once it is confirmed.

What does the evidence show for gestational diabetes symptoms?

• Usually, gestational diabetes has no symptoms at all, and when symptoms do occur they tend to be subtle, like being thirstier than normal or needing to urinate more often. 1
• Every year, 2 to 10 percent of pregnancies in the United States are affected by gestational diabetes, and about half of people who develop it go on to develop type 2 diabetes later in life. 2
• Providers test for gestational diabetes between 24 and 28 weeks of pregnancy using a glucose challenge test, followed by an oral glucose tolerance test to confirm gestational diabetes if the first result is high, which is why routine screening finds far more cases than watching for symptoms would. 3
• Being overweight or having obesity, gaining more weight than recommended during pregnancy, and having a family history of diabetes are the main recognized risk factors for developing gestational diabetes. 1
• Diabetic ketoacidosis, a rare but serious complication, occurred in gestational diabetes in a meaningful share of reviewed pregnancy cases and commonly presented with nausea, vomiting, abdominal pain, and increased thirst or urination, sometimes with only mildly elevated blood sugar, which can make it easy to miss without prompt evaluation. 4

When should I call my provider about gestational diabetes symptoms?

Most gestational diabetes causes no noticeable symptoms at all, which is exactly why the routine screening test between 24 and 28 weeks matters more than watching for signs yourself. If you already have gestational diabetes and develop nausea, vomiting, stomach pain, or unusual thirst and urination together, especially if you feel unwell in a way that does not fit ordinary pregnancy symptoms, contact your provider the same day: these can be signs of diabetic ketoacidosis, a rare but serious complication that can occur even when blood sugar readings look only mildly elevated. This is different from the ordinary, subtle thirst or fatigue that gestational diabetes can sometimes cause on its own. Trust your read on your own body. If something feels off beyond the list above, please consult your healthcare provider rather than waiting it out.