Gestational diabetes mellitus is a common obstetric complication, which seriously endangers the life and health of pregnant women and their fetuses. Therefore, timely detection and treatment is the key to avoid the occurrence of adverse pregnancy outcomes. Gestational diabetes can have the following clinical symptoms: 1. Three symptoms of polyhydramnios, including polyhydramnios, polyphagia and polyuria. Pregnant women with gestational diabetes often feel thirsty and drink significantly more water every day. At the same time, the diet also increases compared to the previous one. Many pregnant women believe that an increase in eating and drinking during pregnancy is normal, so they need to pay attention to distinguish whether the increase in eating and drinking is physiological or pathological. With the increase in diet and water intake, the patient will experience a corresponding increase in urination. 2, due to the stimulation of high blood sugar, some patients with gestational diabetes will have recurrent episodes of vulvovaginal mycosis, accompanied by itching and pain in the vulva. 3, weight gain, gestational diabetes patients under the effect of hyperglycemia, there will be a continuous increase in weight. It is normal for pregnant women to gain weight during pregnancy, but excessive weight gain needs to be brought to the attention of pregnant women. It is generally believed that if you weigh more than 90 kg during pregnancy, you should be alert to the occurrence of gestational diabetes. In summary, the clinical manifestations of gestational diabetes include: trigeminal symptoms, vulvovaginal inflammation, and weight gain.