When diabetes develops during pregnancy, pregnant women will have symptoms of excessive drinking, eating and urination. It is also accompanied by prolonged vomiting and diarrhea, dizziness, blurred vision, panic and weakness. Because of the high level of blood glucose concentration in the body, the basal metabolic rate of the organism is too high. The absorption capacity of nutrients in the gastrointestinal tract is increased, which causes symptoms of hyperphagia and excessive eating in pregnant women. Because the blood sugar concentration in the body increases, the consumption of nutrients also increases. Although the amount of glucose, a substance that provides energy, is higher, the patient will be in a state of prolonged physical wasting. This can affect the growth and development of the fetus, resulting in an increasing size of the fetus that can easily form a giant baby. In the later stages, patients often experience dizziness, panic and weakness, and need to take medication to lower blood sugar in time, otherwise it will lead to congenital diseases in the fetus.