Around 2-3% of pregnant women will develop diabetes during their pregnancy, this is known as gestational diabetes. It usually affects pregnant women in the later stages of pregnancy, but can occur at any time. Gestational diabetes is caused by the body’s inability to produce enough insulin to meet the increased needs during pregnancy.
1 The signs and symptoms of gestational diabetes

Excessive thirst
Gestational diabetes is caused by the hormones produced by the placenta. These hormones block the action of insulin in the body. As a result, the blood sugar levels become high.
Excessive thirst (dryness of mouth) is one of the most common symptoms of gestational diabetes. Other symptoms include fatigue, blurred vision, and increased urination. Gestational diabetes can lead to serious health problems for both the mother and baby if it is not treated.
If you are experiencing excessive thirst during pregnancy, see your doctor right away.