Gestational diabetes refers to the onset or first-time detection of varying degrees of hyperglycemia during pregnancy, including pre-pregnancy unrecognized glucose intolerance and diabetes. Typical clinical symptoms of gestational diabetes include polyuria, polydipsia, polyphagia, or recurrent vulvovaginal candidiasis. If the pregnant woman's weight is greater than or equal to 90 kilograms, and the current pregnancy is complicated by excessive amniotic fluid or macrosomia, there is also a high suspicion of gestational diabetes. In severe cases or those with poor blood sugar control, not only is there an increased risk of preterm labor but also miscarriage, and in severe cases, ketoacidosis may occur.