The symptoms of gestational diabetes differ from those of non-pregnancy diabetes; non-pregnancy diabetes is mainly characterized by excessive drinking, eating, urination, and weight loss. During pregnancy, excessive drinking and eating may be physiological responses due to increased appetite, and frequent urination may be caused by the enlarged uterus pressing on the bladder during early pregnancy. Weight loss is generally not apparent in gestational diabetes due to the growth of the fetus, the uterus, and the increase in amniotic fluid. For women who had a higher body mass index before pregnancy and a family history of diabetes, it is recommended to start glucose tolerance screening from the time of planning to conceive. For those who gain weight rapidly after becoming pregnant and have a significant increase in amniotic fluid, we typically conduct routine diabetes screening between 24 to 28 weeks of pregnancy. Gestational diabetes has severe impacts on the pregnant woman, the fetus, and the newborn, thus early detection and treatment are advised.