Most pregnant women will have a good appetite in the middle of pregnancy, because at this time the fetus is in a stage of rapid development, pregnant women will consume more nutrients, which will easily lead to hyperglycemia, which will mainly lead to the following symptoms: 1. hunger, if pregnant women have hyperglycemia, they will have no sense of satiety after eating, and the amount of food will increase, but often by hunger; 2. thirst is also a common symptom of hyperglycemia in pregnant women, hyperglycemia will cause pregnant women to have the symptoms of urination, thus producing the phenomenon of thirst for water, which belongs to the early symptoms of pregnancy hyperglycemia; 3, frequent urination, urination is also the performance of pregnant women with high blood sugar, and may even have the symptoms of foamy urine; 4, pregnant women with high blood sugar will often feel weak and feeble, which is caused by the lack of energy in the cells.