Gestational diabetes refers to the onset of different levels of hyperglycemia during pregnancy, or first diagnosed during pregnancy, including previously unrecognized glucose intolerance and diabetes before pregnancy. Typical clinical manifestations of gestational diabetes include symptoms such as polyuria, polydipsia, and polyphagia, or recurrent Candida infections of the vulva and vagina. If a pregnant woman weighs more than 90 kilograms, presents with polyhydramnios, or has a macrosomic fetus during this pregnancy, there should be a high degree of vigilance for the possibility of gestational diabetes. Its dangers lie in severe cases or poorly controlled blood sugar in gestational diabetes, which not only tends to lead to miscarriage and preterm birth but also can cause infections, and in severe cases, may lead to ketoacidosis. Therefore, dietary control and medication are very important for managing gestational diabetes.